Author: Jessica.F

Qiu, Shaotong; Gao, Xiang; Zhu, Shifa published their research in Chemical Science in 2021. The article was titled 《Dirhodium(II)-catalysed cycloisomerization of azaenyne: rapid assembly of centrally and axially chiral isoindazole frameworks》.Computed Properties of C4H7Br The article contains the following contents:

A dirhodium(II)-catalyzed asym. cycloisomerization reaction of azaenynes through a cap-tether synergistic modulation strategy, which represents the first catalytic asym. cycloisomerization of azaenynes. This reaction is highly challenging because of its inherent strong background reaction leading to racemate formation and the high capability of coordination of the nitrogen atom resulting in catalyst deactivation. Varieties of centrally chiral isoindazole derivatives was prepared in up to 99 : 1 d.r., 99 : 1 er and 99% yield and diverse enantiomerically enriched atropisomers bearing two five-membered heteroaryls was accessed by using an oxidative central-to-axial chirality transfer strategy. The tethered nitrogen atom incorporated into the starting materials enabled easy late-modifications of the centrally and axially chiral products via C-H functionalizations, which further demonstrated the appealing synthetic utilities of this powerful asym. cyclization.(Bromomethyl)cyclopropane(cas: 7051-34-5Computed Properties of C4H7Br) was used in this study.

(Bromomethyl)cyclopropane(cas: 7051-34-5) is used as a synthetic building block for the introduction of the cyclopropylmethyl group. It was also used in the synthesis of 1,4-dienes via iron-catalyzed cross-coupling with alkenyl Grignard reagents.Computed Properties of C4H7Br

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yu, Zhen-Qiang; Li, Xiaodong; Wan, Wei; Li, Xin-Shun; Fu, Kuo; Wu, Yue; Li, Alexander D. Q. published their research in Chemical Science in 2021. The article was titled 《Cooperatively assembled liquid crystals enable temperature-controlled Forster resonance energy transfer》.Category: bromides-buliding-blocks The article contains the following contents:

Balancing the rigidity of a π-conjugated structure for strong emission and the flexibility of liquid crystals for self-assembly is the key to realizing highly emissive liquid crystals (HELCs). Here we show that (1) integrating organization-induced emission into dual mol. cooperatively-assembled liquid crystals, (2) amplifying mesogens, and (3) elongating the spacer linking the emitter and the mesogen create advanced materials with desired thermal-optical properties. Impressively, assembling the fluorescent acceptor Nile red into its host donor designed according to the aforementioned strategies results in a temperature-controlled Forster resonance energy transfer (FRET) system. Indeed, FRET exhibits strong S-curve dependence as temperature sweeps through the liquid crystal phase transformation. Such thermochromic materials, suitable for dynamic thermo-optical sensing and modulation, are anticipated to unlock new and smart approaches for controlling and directing light in stimuli-responsive devices. The results came from multiple reactions, including the reaction of 1,6-Dibromohexane(cas: 629-03-8Category: bromides-buliding-blocks)

1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of pyrrolo-tetrathiafulvalene molecular bridge (6PTTF6) to study redox switching behavior of single molecules; synthesis of water-soluble thermoresponsive polylactides.Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Nakashima, Yusei; Matsumoto, Junki; Nishikata, Takashi published their research in ACS Catalysis in 2021. The article was titled 《Iron-Catalyzed Stereoconvergent Tertiary Alkylation of (E)- and (Z)-Mixed Internal Olefins with Functionalized Tertiary Alkyl Halides》.SDS of cas: 1530-32-1 The article contains the following contents:

Herein, an efficient method for the stereoconvergent tertiary alkylations of (E)- and (Z)-mixed internal olefins (styrenes, enamides, and vinylic ethers) to produce trisubstituted olefins bearing a quaternary carbon center via an addition/elimination reaction in the presence of an iron catalyst. (E)- and (Z)-mixed internal olefins with various E/Z ratios reacted smoothly with α-bromocarbonyls as a tertiary alkyl source to exclusively produce (E)-trisubstituted olefins was reported. Mechanistic studies revealed that each of the (E)- and (Z)-internal olefins exhibited the same reactivity, and the exclusive generation of (E)-trisubstituted olefin products could be attributed to the β-hydrogen elimination of an alkyl iron species. The developed method can be used to synthesize highly congested trisubstituted olefins containing a quaternary carbon atom that bears various alkyl chains. In the experimental materials used by the author, we found Ethyltriphenylphosphonium bromide(cas: 1530-32-1SDS of cas: 1530-32-1)

Ethyltriphenylphosphonium bromide(cas: 1530-32-1) is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. It is also used as catalysts in the synthesis of certain organic compounds and as a pharmaceutical intermediate.SDS of cas: 1530-32-1

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Tsushima, Takumi; Tanaka, Hideya; Nakanishi, Kazuki; Nakamoto, Masaaki; Yoshida, Hiroto published an article in 2021. The article was titled 《Origins of Internal Regioselectivity in Copper-Catalyzed Borylation of Terminal Alkynes》, and you may find the article in ACS Catalysis.Safety of 1-Bromo-3,4,5-trimethoxybenzene The information in the text is summarized as follows:

Installation of a boron functionality into a more substituted carbon of terminal alkynes has been a challenging issue in chem. synthesis, since inherently Lewis acidic boron moieties, in principle, favor their attachment to a terminal carbon. Herein, we report on the highly internal-selective borylation of terminal alkynes under copper catalysis, wherein diminishment of boron-Lewis acidity and ligand-derived steric bulk around a copper center are the key to the success. In particular, the use of an anthranilamide-substituted boron moiety [B(aam)] is of high synthetic significance, because its properly diminished Lewis acidity enabled the internal regioselectivity and the Suzuki-Miyaura cross-coupling activity to be compatibly achieved. This method provided a direct and universal approach to variously substituted branched alkenylboron compounds, regardless of electronic and steric properties of a substituent on terminal alkynes. In the experiment, the researchers used many compounds, for example, 1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8Safety of 1-Bromo-3,4,5-trimethoxybenzene)

1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8) is an important raw material and intermediate used in organic synthesis, pharmaceuticals, agrochemicals and dyestuff.Safety of 1-Bromo-3,4,5-trimethoxybenzene1-Bromo-3,4,5-trimethoxybenzene can be used to synthesize N,N′-diarylated indolo[3,2-b]carbazole derivatives, which can find applications in electrophotography.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yuan, Yuehua; Zhou, Wenfa; Tian, Maozhong; Song, Jiangtao; Bai, Yunfeng; Feng, Feng; Song, Yinglin published an article in 2021. The article was titled 《Synthesis, characterization and third-order nonlinear optical behaviour of three novel ethyne-linked donor/acceptor chromophores》, and you may find the article in Dyes and Pigments.Name: 2,5-Dibromothiophene The information in the text is summarized as follows:

Three novel ethyne-linked donor/acceptor chromophores, BAB, BAS and SAS were synthesized. The results of BAB in femtosecond and nanosecond Z-scan at 532 nm reveal that the transition from saturable absorption (SA) to reverse saturable absorption (RSA), while that of BAS and SAS display RSA. The femtosecond Z-scan results for all compounds at 600 nm-800 nm indicate the obvious RSA, which can be mainly attributed to the two-photon absorption (TPA). The TA results demonstrate that all compounds display strong excited-state absorption and long lifetime, and the evolution of TA spectra for these compounds reveals the relaxation process from the local excited-state (LE) to charge transfer state (CTS). With different conjugation extent and intramol. charge transfer (ICT), the nonlinear response and excited-state dynamics of these chromophores could be dramatically modulated. The threshold of BAS/DCM solution excited at 532 nm with nanosecond pulse was 0.631 J/cm2. These compounds may be the potential candidates for future application in optical limiting. In the experiment, the researchers used 2,5-Dibromothiophene(cas: 3141-27-3Name: 2,5-Dibromothiophene)

2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used as starting reagent for the synthesis of α,α′-didecylquater-, -quinque- and -sexi-thiophenes.Name: 2,5-Dibromothiophene

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Pantelic, Nebojsa D.; Bozic, Bojan; Zmejkovski, Bojana B.; Banjac, Nebojsa R.; Dojcinovic, Biljana; Wessjohann, Ludger A.; Kaluderovic, Goran N. published an article in 2021. The article was titled 《In vitro evaluation of antiproliferative properties of novel organotin(IV) carboxylate compounds with propanoic acid derivatives on a panel of human cancer cell lines》, and you may find the article in Molecules.Name: Methyl 3-bromopropanoate The information in the text is summarized as follows:

The synthesis of novel triphenyltin(IV) compounds, Ph3SnLn (n = 1-3), with oxaprozin (3-(4,5-diphenyloxazol-2-yl)propanoic acid), HL1, and the new propanoic acid derivatives 3-(4,5-bis(4-methoxylphenyl)oxazol-2-yl)propanoic acid, HL2, and 3-(2,5-dioxo-4,4-diphenylimidazolidin-1-yl)propanoic acid, HL3, has been performed. The ligands represent com. drugs or their derivatives and the tin complexes have been characterized by standard anal. methods. The in vitro antiproliferative activity of both ligands and organotin(IV) compounds has been evaluated on the following tumor cell lines: human prostate cancer (PC-3), human colorectal adenocarcinoma (HT-29), breast cancer (MCF-7), and hepatocellular cancer (HepG2), as well as on normal mouse embryonic fibroblast cells (NIH3T3) with the aid of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-12 diphenyltetrazolium bromide) and CV (crystal violet) assays. Contrary to the inactive ligand precursors, all organotin(IV) carboxylates showed very good activity with IC50 values ranging from 0.100 to 0.758 μM. According to the CV assay (IC50 = 0.218 ± 0.025 μM), complex Ph3SnL1 demonstrated the highest cytotoxicity against the caspase 3 deficient MCF-7 cell line. Inductively coupled plasma mass spectrometry (ICP-MS) anal. indicated a two-fold lower concentration of tin in MCF-7 cells in comparison to platinum. To investigate the mechanism of action of the compound Ph3SnL1 on MCF-7 cells, morphol., autophagy and cell cycle anal., as well as the activation of caspase and ROS/RNS and NO production, has been performed. Results suggest that Ph3SnL1 induces caspase-independent apoptosis in MCF-7 cells.Methyl 3-bromopropanoate(cas: 3395-91-3Name: Methyl 3-bromopropanoate) was used in this study.

Methyl 3-bromopropanoate(cas: 3395-91-3) belongs to bromides. 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.Name: Methyl 3-bromopropanoate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yang, Yu-Zhong; Li, Yang; Lv, Gui-Fen; He, De-Liang; Li, Jin-Heng published an article in 2022. The article was titled 《Nickel-Catalyzed C-S Reductive Cross-Coupling of Alkyl Halides with Arylthiosilanes toward Alkyl Aryl Thioethers》, and you may find the article in Organic Letters.Reference of (Bromomethyl)cyclopropane The information in the text is summarized as follows:

A nickel-catalyzed C-S reductive cross-coupling of alkyl halides with arylthiosilanes for producing alkyl aryl thioethers is developed. This reaction is initiated by umpolung transformations of arylthiosilanes followed by C-S reductive cross-coupling with alkyl halides to manage an electrophilic alkyl group onto the electrophilic sulfur atom and then construct a C(sp3)-S bond, and features exquisite chemoselectivity, excellent tolerance of diverse functional groups, and wide applications for late-stage modification of biol. relevant mols. The experimental process involved the reaction of (Bromomethyl)cyclopropane(cas: 7051-34-5Reference of (Bromomethyl)cyclopropane)

(Bromomethyl)cyclopropane(cas: 7051-34-5) is used as a synthetic building block for the introduction of the cyclopropylmethyl group. It was also used in the synthesis of 1,4-dienes via iron-catalyzed cross-coupling with alkenyl Grignard reagents.Reference of (Bromomethyl)cyclopropane

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Kachkovskyi, Georgii; Cieslak, Marcin; Graczyk, Piotr; Zawadzki, Przemyslaw; Kalinowska-Tluscik, Justyna; Werlos, Mateusz published an article in 2022. The article was titled 《Photocatalytic Approach to α,α-Difluoroalkyl Alcohols》, and you may find the article in Synthesis.Quality Control of 4-Bromobutanoic acid The information in the text is summarized as follows:

A convenient approach to previously poorly accessible α,α-difluoroalkyl alcs. R1R2OHCCF2R3 [R1 = Ph, 3-MeC6H4, 4-MeOC6H4, etc.; R2 = H, Me; R3 = i-Pr, t-Bu, cyclohexyl, etc.] by visible light-mediated photocatalysis was developed. Broad scope of the transformation together with exptl. simplicity and scalability using flow techniques opened good prospects for further studies of properties (including biol.) of these novel products. The results came from multiple reactions, including the reaction of 4-Bromobutanoic acid(cas: 2623-87-2Quality Control of 4-Bromobutanoic acid)

4-Bromobutanoic acid(cas: 2623-87-2) belongs to carboxylic acids. The chief chemical characteristic of the carboxylic acids is their acidity. They are generally more acidic than other organic compounds containing hydroxyl groups but are generally weaker than the familiar mineral acids (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).Quality Control of 4-Bromobutanoic acid

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2022,Biesen, Lukas; Krenzer, Julius; Nirmalananthan-Budau, Nithiya; Resch-Genger, Ute; Mueller, Thomas J. J. published an article in Chemical Science. The title of the article was 《Asymmetrically bridged aroyl-S,N-ketene acetal-based multichromophores with aggregation-induced tunable emission》.Safety of Tris(4-bromophenyl)amine The author mentioned the following in the article:

Asym. bridged aroyl-S,N-ketene acetals and aroyl-S,N-ketene acetal multichromophores can be readily synthesized in consecutive three-, four-, or five-component syntheses in good to excellent yields by several successive Suzuki-couplings of aroyl-S,N-ketene acetals and bis(boronic)acid esters. Different aroyl-S,N-ketene acetals as well as linker mols. yield a library of 23 multichromophores with substitution and linker pattern-tunable emission properties. This allows control of different communication pathways between the chromophores and of aggregation-induced emission (AIE) and energy transfer (ET) properties, providing elaborate aggregation-based fluorescence switches. In the experiment, the researchers used many compounds, for example, Tris(4-bromophenyl)amine(cas: 4316-58-9Safety of Tris(4-bromophenyl)amine)

In other references, Tris(4-bromophenyl)amine(cas: 4316-58-9) is often used in the synthesis of porous luminescent covalent–organic polymers (COPs)Safety of Tris(4-bromophenyl)amine

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2022,Jung, Garyn L.; McDaniel, Katherine L.; LoPachin, Richard M.; Geohagen, Brian C.; Smith, Alicia; Huffstickler, Mitchell; Herr, David W. published an article in NeuroToxicology. The title of the article was 《In vivo neurophysiological assessment of in silico predictions of neurotoxicity: Citronellal, 3,4-dichloro-1-butene, and benzyl bromoacetate》.Application In Synthesis of Benzyl 2-bromoacetate The author mentioned the following in the article:

Neurotoxicants may be widespread in the environment and can produce serious health impacts in the human population. Screening programs that use in vitro methods have generated data for thousands of chems. However, these methods often do not evaluate repeated or prolonged exposures, which are required for many neurotoxic outcomes. Addnl., the data produced by such screening methods may not include mechanisms which play critical biol. roles necessary for in vivo neurotoxicity. The Hard and Soft Acids and Bases (HSAB) in silico model focuses on chem. structure and electrophilic properties which are important to the formation of protein adducts. A group of structurally diverse chems. have been evaluated with an in silico screening approach incorporating HSAB parameters. However, the predictions from the expanded chem. space have not been evaluated using in vivo methods. Three chems. predicted to be cumulative toxicants were selected for in vivo neurotoxicol. testing. Adult male Long-Evans rats were treated orally with citronellal (CIT), 3,4-dichloro-1-butene (DCB), or benzyl bromoacetate (BBA) for 8 wk. Behavioral observations were recorded weekly to assess motor function. Peripheral neurophysiol. measurements were derived from nerve excitability (NE) tests which involved compound muscle action potentials (CMAPs) in the tail and foot, and mixed nerve action potentials (MNAPs) in the tail. Compound nerve action potentials (CNAPs) and nerve conduction velocity (NCV) in the tail were also quantified. Peripheral inputs into the central nervous system were examined using somatosensory evoked potentials recorded from the cortex (SEPCTX) and cerebellum (SEPCEREB). CIT or BBA did not result in significant alterations to peripheral nerve or somatosensory function. DCB reduced grip-strength and altered peripheral nerve function. The MNAPs required less current to reach 50% amplitude and had a lower calculated rheobase, suggesting increased excitability. Increased CNAP amplitudes and greater NCV were also observed Novel changes were found in the SEPCTX with an abnormal peak forming in the early portion of the waveforms of treated rats, and decreased latencies and increased amplitudes were observed in SEPCEREB recordings. These data contribute to testing an expanded chem. space from an in silico HSAB model for predicting cumulative neurotoxicity and may assist with prioritizing chems. to protect human health. In the experiment, the researchers used Benzyl 2-bromoacetate(cas: 5437-45-6Application In Synthesis of Benzyl 2-bromoacetate)

Benzyl 2-bromoacetate(cas: 5437-45-6) belongs to benzyl acetate. Benzyl acetate is an aromatic chemical, usually appearing as a clear liquid with a moderate sweet-jasmine fragrance. This compound appears as a component of some of our fragrance blends.Application In Synthesis of Benzyl 2-bromoacetate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary