Tag: 300-400

A new HPLC analysis of residual penicillins in edible animal tissues by pre-column fluorescence derivatization was written by Ushimizu, Toru;Sato, Toshio;Saito, Tadao;Itoh, Takatoshi. And the article was included in Animal Science Journal (Tokyo, Japan) in 2001.Reference of 80480-15-5 The following contents are mentioned in the article:

An anal. method was developed for the simultaneous determination of penicillins (benzylpenicillin, oxacillin, cloxacillin, dicloxacillin and nafcillin) remaining in edible tissues (muscle and kidney) of animals (bovine and swine) by pre-column fluorescence derivatization. For labeling a carboxyl group in penicillins, 7 kinds of fluorescence derivatization reagents were tested: 3-bromomethyl-6,7-dimethoxy-1-methyl-1,2-dihydroquinoxaline-2-one, 4-bromomethyl-7-methoxycoumarin, 5,6-dimethoxy-2-(4-hydrazinocarbonylphenyl)benzothiazole, 1-bromoacetylpyrene (BAP), 6,7-dimethoxy-1-methyl-2(H)-quinolinone-3-propinohydrazide, 2-(2,3-naphthalimino)ethyl trifluoromethanesulfonate and 9-anthryldiazomethane. BAP showed the best score on reactivity and was selected and used for the following examinations Optimum conditions for HPLC anal. were determined with reference to the stability of each reagent, reactive temperature and time. Edible animal tissues were extracted with water and deproteinized with sulfuric acid and sodium tungstate, followed by concentration with C1 (solid-phase extraction) cartridge column. The acetonitrile eluate from the column was derivatized with BAP and 18-crown-6 reagents at 40°C for 30 min. The derivatized sample was analyzed by HPLC with reversed-phase mode. The mean recovery range was 73-96% for benzylpenicillin, 73- 90% for oxacillin, 64-83% for cloxacillin, 62-71% for nafcillin and 61-67% for dicloxacillin in tissues. The detection limits for benzylpenicillin and other penicillins were about 2 and 5 ng/g min tissues, resp. In the suspected case of penicillin residues, benzylpenicillin was determined (0.045-29.0 μg/g) in bovine muscle and kidney by this method. The simple and sensitive method was expected for routine anal. of penicillins in edible animal tissues. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Reference of 80480-15-5).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Reference of 80480-15-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Reaction of 1-Nitroso-2-naphthols with α-Functionalized Ketones and Related Compounds: The Unexpected Formation of Decarbonylated 2-Substituted Naphtho[1,2-d][1,3]oxazoles was written by Aljaar, Nayyef;Malakar, Chandi C.;Conrad, Juergen;Frey, Wolfgang;Beifuss, Uwe. And the article was included in Journal of Organic Chemistry in 2013.Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone The following contents are mentioned in the article:

1-Nitroso-2-naphthols I (R = H, MeO) or 2-nitroso-1-naphthol underwent cyclocondensation reactions with bromomethyl aryl ketones R¹COCH₂Br (R¹ = Ph, 4-MeC₆H₄, 2-MeOC₆H₄, 4-MeOC₆H₄, 3-BrC₆H₄, 4-FC₆H₄, 4-ClC₆H₄, 3,4-Cl₂C₆H₃, 4-NCC₆H₄, 4-MeO₂CC₆H₄, 2-naphthyl, 1-pyrenyl), α-chloro, α-mesyloxy, α-tosyloxy, or α-hydroxy acetophenones, or substituted alkyl bromides R¹CH₂Br (R¹ = Ph, Me₂C:CH, NC, EtO₂C, EtO₂CCO) with 3 equiv potassium carbonate in 1,2-dichloroethane to give naphthooxazoles II (R = H, MeO; R¹ = Ph, 4-MeC₆H₄, 2-MeOC₆H₄, 4-MeOC₆H₄, 3-BrC₆H₄, 4-FC₆H₄, 4-ClC₆H₄, 3,4-Cl₂C₆H₃, 4-NCC₆H₄, 4-MeO₂CC₆H₄, 2-naphthyl, 1-pyrenyl, Me₂C:CH, NC, EtO₂C) or III in 45-85% yields; α-bromo ketone or diketone reactants yielded naphthooxazoles with the loss of one or two carbonyl groups, resp. Acylation of 1-nitroso-2-naphthol with 1-phenacylpyridinium bromide and cyclocondensation under the conditions used for phenacyl bromide gave II (R = H; R¹ = PhCO). The reaction is proposed to occur through the intermediacy of naphthoquinone mono(acyloxyimines) such as IV. The structure of IV was determined by X-ray crystallog. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. For many applications, organobromides represent a compromise of reactivity and cost.Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Solubilizaton of single-walled carbon nanotubes by using polycyclic aromatic ammonium amphiphiles in water – strategy for the design of high-performance solubilizers was written by Tomonari, Yasuhiko;Murakami, Hiroto;Nakashima, Naotoshi. And the article was included in Chemistry – A European Journal in 2006.Category: bromides-buliding-blocks The following contents are mentioned in the article:

We describe the design of polycyclic aromatic compounds with high performance that dissolve single-walled carbon nanotubes (SWNTs). Synthetic amphiphiles trimethyl-(2-oxo-2-phenylethyl)-ammonium bromide (1) and trimethyl-(2-naphthalen-2-yl-2-oxo-ethyl)-ammonium bromide (2) carrying a Ph or a naphthyl moiety were not able to dissolve/disperse SWNTs in water. By contrast, trimethyl-(2-oxo-2-phenanthren-9-yl-ethyl)-ammonium bromide (3) solubilized SWNTs, although the solubilization ability was lower than that of trimethyl-(2-oxo-2-pyrene-1-yl-ethyl)-ammonium bromide (4) (solubilization behavior observed by using 4 was described briefly in reference [4a]). Transmission electron microscopy (TEM), as well as visible/near-IR, fluoroscence, and near-IR photoluminescence spectroscopies were employed to reveal the solubilization properties of 4 in water, and to compare these results with those obtained by using sodium dodecyl sulfate (SDS) and hexadecyl-trimethylammonium bromide (HTAB) as solubilizers. Compound 4 solubilized both the as-produced SWNTs (raw-SWNTs) and purified SWNTs under mild exptl. conditions, and the solubilization ability was better than that of SDS and HTAB. Near-IR photoluminescence measurements revealed that the chiral indexes of the SWNTs dissolved in an aqueous solution of 4 were quite different from those obtained by using micelles of SDS and HTAB; for a SWNTs/4 solution, the intensity of the (7,6), (9,5), and (12,1) indexes were strong and the chirality distribution was narrower than those of the micellar solutions This indicates that the aqueous solution of 4 has a tendency to dissolve semiconducting SWNTs with diameters in the range of 0.89-1.0 nm, which are larger than those SWNTs (0.76-0.97 nm) dissolved in the aqueous micelles of SDS and HTAB. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Category: bromides-buliding-blocks).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Phosphorescence color tuning by ligand, and substituent effects of multifunctional iridium(III) cyclometalates with 9-arylcarbazole moieties was written by Ho, Cheuk-Lam;Wang, Qi;Lam, Ching-Shan;Wong, Wai-Yeung;Ma, Dongge;Wang, Lixiang;Gao, Zhi-Qiang;Chen, Chin-Hsin;Cheah, Kok-Wai;Lin, Zhenyang. And the article was included in Chemistry – An Asian Journal in 2009.HPLC of Formula: 922721-30-0 The following contents are mentioned in the article:

The synthesis, isomeric studies, and photophys. characterization of multifunctional cyclometalated Ir(III) complexes containing a fluoro- or Me-substituted 2-[3-(N-phenylcarbazolyl)]pyridine mol. framework are presented. All of the complexes are thermally stable solids and highly efficient electrophosphors. The optical, electrochem., photo-, and electrophosphorescence traits of these Ir phosphors were studied in terms of the electronic nature and coordinating site of the aryl or pyridyl ring substituents. The correlation between the functional properties of these phosphors and the results of d. functional theory calculations was made. Arising from the propensity of the electron-rich carbazolyl group to facilitate hole injection/transport, the presence of such a moiety can increase the highest-occupied MO levels and improve the charge balance in the resulting complexes relative to the parent phosphor with 2-phenylpyridine ligands. Remarkably, the excited-state properties can be manipulated through ligand and substituent effects that allow the tuning of phosphorescence energies from bluish green to deep red. Electrophosphorescent organic light-emitting diodes (OLEDs) with outstanding device performance can be fabricated based on these materials, which show a maximum current efficiency of ∼43.4 cd A^-1, corresponding to an external quantum efficiency of ∼12.9% ph/el (photons per electron) and a power efficiency of ∼33.4 Lm W^-1 for the best device. The present work provides a new avenue for the rational design of multifunctional Ir-carbazolyl electrophosphors, by synthetically tailoring the carbazolyl pyridine ring that can reveal a superior device performance coupled with good color-tuning versatility, suitable for multicolor-display technol. This study involved multiple reactions and reactants, such as 3-Bromo-9-(4-fluorophenyl)-9H-carbazole (cas: 922721-30-0HPLC of Formula: 922721-30-0).

3-Bromo-9-(4-fluorophenyl)-9H-carbazole (cas: 922721-30-0) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.HPLC of Formula: 922721-30-0

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Extending the Excitation Wavelength of Potential Photosensitizers via Appendage of a Kinetically Stable Terbium(III) Macrocyclic Complex for Applications in Photodynamic Therapy was written by Ung, Phuc;Clerc, Michele;Huang, Huaiyi;Qiu, Kangqiang;Chao, Hui;Seitz, Michael;Boyd, Ben;Graham, Bim;Gasser, Gilles. And the article was included in Inorganic Chemistry in 2017.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

The development of viable photodynamic therapy protocols is often hindered by photosensitizers that require high-energy UV irradiation that has limited potential for clin. use due to its low tissue penetration. Herein, we report a strategy for extending the excitation wavelength of potential photosensitizers via the covalent attachment of a terbium(III)-1,4,7,10-tetraazacyclododecane-1,4,7-triacetate complex (DO3A-Tb). The method was systematically demonstrated with a series of polycyclic aromatic hydrocarbons (naphthalene, phenanthrene, anthracene, pyrene, and fluoranthene) to prepare six new complexes (Tb1-Tb6) with bathochromic shifts that extended into the visible region. Determination of their quantum yields for singlet oxygen (¹O₂) production at 350 and 420 nm showed significant enhancements from the parent mol. in all cases. Cell viability studies on cervical cancer cells (HeLa) and noncancerous MRC-5 cells showed no measurable cytotoxicity for all complexes prior to light irradiation However, after irradiation at 420 nm (20 min, 9.27 J cm^-2), Tb3-Tb6 were phototoxic to HeLa cells with IC₅₀ values between 14.3-32.3 μM. Cell morphol. studies and fluorescence microscopy with live/dead cell stains confirmed these findings. In addition, these complexes were highly stable in human blood plasma, with no significant degradation observed after 96 h at 37 °C. This excellent phototoxicity profile and high stability in blood plasma, coupled with the moderately lipophilic nature of the complexes, favorably indicate the potential of DO3A-Tb as a heavy atom-bearing moiety for modification of potential photosensitizers into ideal phototherapeutic drug candidates with longer excitation wavelengths for in vivo application. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Luminescent Palladacycles Containing a Pyrene Chromophor; Synthesis, Biological and Computational Studies of the Interaction with DNA and BSA was written by Karami, Kazem;Ramezanpour, Azar;Zakariazadeh, Mostafa;Shahpiri, Azar;Kharaziha, Mahshid;Kazeminasab, Akram. And the article was included in ChemistrySelect in 2019.Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone The following contents are mentioned in the article:

One of the most active areas within the field of bioorganometallic chem., complexes of N-heterocyclic carbenes (NHCs), have recently gained interest. Herein, we report two luminescent palladium N-heterocyclic carbene complexes; namely [Pd{(C,N)-C₆H₄CH₂NH(CH₂CH₃)}(1)] (2) and [Pd{(C,N)-C₆H₄CH₂NH₂}(1)] (3) (1=1-methyl-3-(2-oxo-2-(pyren-1-yl)ethyl)-2,3-dihydroimidazol-2-ylidene) which were synthesized from the reaction of luminescent imidazolium salt (1(H)Br) and binuclear Palladacycles. The interactions of them with CT-DNA evaluated via absorption, emission and CD spectral techniques as well as measurements of viscosity and thermal denaturation and the results have been shown that they bounded to CT-DNA by intercalation and groove binding modes. The in vitro cytotoxicity of compounds 2–3 and 1(H)Br on human breast (MCF-7) and cervical epithelial carcinoma (HeLa) cancer cells lines, indicated the wide range of anticancer activities of them with low IC₅₀ values. Moreover, based on the protein binding ability studies, the intrinsic fluorescence of BSA could be strongly quenched by compounds via a static quenching mechanism. Competitive binding study using Eosin, Digoxin and Ibuprofen as site markers, indicated that the compounds could bind to sites I and II on BSA structure. Finally, all data obtained from biophys. studies were validated by mol. modeling study. Computational results showed that palladium complexes have the potential for detection of mismatch DNA. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Quality Control of 2-Bromo-1-(pyren-1-yl)ethanone

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Covalently Bonded MoS₂-Borocarbonitride Nanocomposites Generated by Using Surface Functionalities on the Nanosheets and Their Remarkable HER Activity was written by Pramoda, K.;Ayyub, Mohd Monis;Singh, Navin Kumar;Chhetri, Manjeet;Gupta, Uttam;Soni, Amit;Rao, C. N. R.. And the article was included in Journal of Physical Chemistry C in 2018.Synthetic Route of C18H11BrO The following contents are mentioned in the article:

In the light of the recent discovery that C-rich borocarbonitrides show electrocatalytic activity for generating H from H₂O, the authors synthesized nanocomposites by covalently crosslinking BC₇N with MoS₂ sheets to explore whether the HER activity can be significantly enhanced. To cross-link BC₇N and MoS₂ sheets, the authors have exploited the presence of different functional groups on the surfaces of BN (NH₂) and graphene (COOH) domains of the borocarbonitride, as quant. determined by FLOSS. The authors have thus obtained two nanocomposites differing in the location of the crosslinking and these are designated as BN/BCN-MoS₂ and G/BCN-MoS₂, depending on which domains in the borocarbonitride participate in crosslinking. These nanocomposites were characterized by various spectroscopic methods including fluorescence labeling and their electrochem. and photochem. HER activity studied. The composite where the graphene domains are cross-linked to MoS₂ nanosheets, G/BCN-MoS₂ (1:2), exhibits outstanding electrochem. HER activity with an onset potential of -30 mV (vs. RHE) and a c.d. of 10 mA cm^-2 at an overpotential of -35 mV. This performance is closely comparable to that of Pt. The composite where the BN domains were cross-linked show somewhat lower activity. The phys. mixture of BCN and MoS₂, however, does not display any notable HER activity. The BCN-MoS₂ composites also exhibit good photochem. activity. It is noteworthy that 2H-MoS₂, which does not exhibit significant catalytic activity, can be rendered highly active by crosslinking with BCN. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Synthetic Route of C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Synthetic Route of C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Determination of simvastatin and its active metabolite in human plasma by column-switching high-performance liquid chromatography with fluorescence detection after derivatization with 1-bromoacetylpyrene was written by Ochiai, Hisao;Uchiyama, Naotaka;Imagaki, Kazuhide;Hata, Shunsuke;Kamei, Toshio. And the article was included in Journal of Chromatography B: Biomedical Sciences and Applications in 1997.Application In Synthesis of 2-Bromo-1-(pyren-1-yl)ethanone The following contents are mentioned in the article:

By using a fluorescent derivatization and column-switching technique, a highly sensitive and selective high-performance liquid chromatog. (HPLC) method has been developed for the determination of simvastatin (I, β-hydroxy-δ-lactone form) and its active hydrolyzed metabolite (II, β,δ-dihydroxy acid form of I) in human plasma. A plasma sample spiked with internal standards was applied to a C₈ solid-phase extraction column. I and II were sep. extracted from internal standards was applied to a C₈ solid-phase extraction column. I and II were sep. extracted from plasma into two fractions. I in one of the fractions was hydrolyzed to II. A fluorescent derivative was prepared by esterification of II with 1-bromoacetylpyrene in the presence of 18-crown-6 for both fractions. The pyrenacyl ester of II thus obtained was purified on a phenylboronic acid (PBA) solid-phase extraction column, and was measured by column-switching HPLC with fluorescence detection. The calibration curves for both I and II were linear in the concentration range of 0.1-10 ng/mL. The intra-day coefficients of variation were less than 11.0%, and the accuracies were between 91.7% and 117% within the concentration range for both analytes. The limits of quantification (LOQ) for both analytes were set to 0.1 ng/mL. This assay method has adequate sensitivity and selectivity to measure the concentrations of I and II in human plasma from clin. studies. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Application In Synthesis of 2-Bromo-1-(pyren-1-yl)ethanone).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Application In Synthesis of 2-Bromo-1-(pyren-1-yl)ethanone

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Water-Soluble Pyrene-Adorned Imidazolium Salts with Multicolor Solid-State Fluorescence: Synthesis, Structure, Photophysical Properties, and Application on the Detection of Latent Fingerprints was written by Nirmala, Muthukumaran;Vadivel, Ramanan;Chellappan, Selvaraju;Malecki, Jan Grzegorz;Ramamurthy, Perumal. And the article was included in ACS Omega in 2021.Formula: C18H11BrO The following contents are mentioned in the article:

New water-soluble acetylpyrene-bound imidazolium salts (1-N-methyl-3-(2-oxo-2-(pyren-1-yl)ethyl)-imidazolium bromide (1), 1-N-isopropyl-3-(2-oxo-2-(pyren-1-yl)ethyl)-imidazolium bromide (2), 1-N-allyl-3-(2-oxo-2-(pyren-1-yl)ethyl)-imidazolium bromide (3), and 1-N-isopropyl-3-(2-oxo-2-(pyren-1-yl)ethyl)-imidazolium hexafluorophosphate (4)) were synthesized from the reaction between 1-bromoacetylpyrene and N-substituted imidazoles in excellent yield. The new mols. were fully characterized by elemental anal., FT-IR, multinuclear (¹H, ¹³C, and ¹⁹F) NMR techniques, and single-crystal X-ray diffraction anal. Investigations on the crystal packing of 1, 3, and 4 show the presence of inter/intramol. weak interactions, including the π···π stacking interaction between the pairs of pyrene mols. The photophys. properties were investigated in detail for the four imidazolium salts. Experiments show that the emissions observed for all the four compounds are due to the excited monomer and static excimer. Very interestingly, all the four compounds exhibit solid-state multicolor fluorescence depending on the excitation wavelength. The solid-state emissions were monitored using a fluorescence microscope. Finally, a fingerprint powder was formulated based on compound 4 and demonstrated as an efficient fluorescent fingerprint powder for forensic applications. The formulated powder revealed all the 3 level information along with peculiar individual characteristics of the fingerprints under investigation. The fingerprints were further viewed through a fluorescence microscope, and the results were discussed in detail. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Formula: C18H11BrO).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Formula: C18H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Association Behavior of 1-Pyrenyl Pendants Introduced into the Papain Active Site was written by Sakurai, Tadamitsu;Miyata, Kazue;Watanabe, Kenichiro;Kubo, Kanji;Inoue, Hiroyasu. And the article was included in Bulletin of the Chemical Society of Japan in 1999.Product Details of 80480-15-5 The following contents are mentioned in the article:

1-(Bromoacetyl)pyrene (BAP) was found to selectively alkylate the cysteine-25 residue (Cys-25) of papain, inactivating the enzyme. A comparison of the spectroscopic behavior of BAP-modified papain with that of the reference compound, 1-{[2-(acetylamino)ethylthio]acetyl}pyrene (TAP), showed that the pyrenecarbonylmethyl pendant (covalently bound to Cys-25 in a 1:1 stoichiometric ratio) gives a new absorption around 390 nm and a long-wavelength fluorescence at 465 nm, which are both characteristic of an associated dimer. Effects of solvent and concentration on the absorption and emission spectra of TAP as well as the derivatized enzyme substantiate the dimer formation in the ground state. The finding that the pendant-carbonyl-¹³C carbon signal undergoes a large upfield shift in the papain active site, as compared to the corresponding signal of ¹³C-labeled TAP, confirms that the pyrenecarbonyl moiety adopts an enolate-type resonance structure (making the pyrene ring electron-deficient) on formation of a strong hydrogen bond to the neighboring amino acid residue(s). It is proposed that the significant contribution of the enolate-type resonance structure is a driving force for promoting the dimerization of the pyrenecarbonylmethyl reporter group attached to Cys-25 mainly through dipole-dipole and hydrophobic interactions. On the other hand, the introduction of the imino spacer between the 1-pyrenyl carbon and the acetyl carbonyl carbon in BAP-derived pendant greatly weakened a tendency to produce a pendant dimer in the ground state, providing a piece of evidence in support of this proposal. This study involved multiple reactions and reactants, such as 2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5Product Details of 80480-15-5).

2-Bromo-1-(pyren-1-yl)ethanone (cas: 80480-15-5) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. For many applications, organobromides represent a compromise of reactivity and cost.Product Details of 80480-15-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary