Tag: 100-200

Oxacyclanes was written by Kirrmann, A.;Hamaide, N.. And the article was included in Bulletin de la Societe Chimique de France in 1957.Quality Control of 1-Bromo-6-methoxyhexane This article mentions the following:

Oxacyclanes were formed by heating γ, δ, or ε-methoxylated alkyl bromides with FeCl₃. NaOMe (1 mole) in MeOH added slowly with stirring to 1 mole dibromoalkane at 60°, the mixture boiled gently 4 hrs. and cooled, the washed and dried product distilled, and the bromo methoxy alkane fraction carefully redistilled in vacuo gave MeO(CH₂)₆Br, b₁₄ 94°, n_D²⁰ 1.458, d₂₀ 1.1942, MeCH(OMe)CH₂CH₂CHBrMe, b₃₅ 100°, n_D²⁰ 1.441, d₂₀1.1824, MeO(CH₂)₅Br, b₁₅ 76°, n_D²⁰ 1.455, d₂₀ 1.2420, and MeO(CH₂)₄Br (I), b₁₅ 60°, n_D²⁰ 1.452, d₂₀ 1.3052, in 56, 53, 55, and 57% yields, resp. Regulated mild distillation of these products in the presence of a few mg. FeCl₃ gave the oxacyclanes (compound, % yield, b.p., n_D²⁰, d₂₀, λ in μ): tetrahydrofuran, 100, 67°, 1.407, 0.8874, 3.34, 6.85, 9.34; tetrahydropyran, 100, 88°, 1.4205, 0.8851, 3.30, 6.92, 9.12, 11.46, 12.26; hexamethylene oxide, 70, 116°, 1.4355, 0.895, 3.42, 6.90, 8.80, 9.02, 10.04, 10.30, 12.22, 12.44; 2,5-dimethyltetrahydrofuran, 80, 96°, 1.410, 0.8373, 3.3, 6.8, 7.2, 9.1, 11.3, 11.94, 12.1. The MeBr formed in the cyclization of I was condensed at -15° with anhydrous Et₂O and Mg, the MeMgBr treated with BzH and the MePhCHOH formed identified as the phenylurethan. The mechanism of the reaction was interpreted through the intermediary formation of a tertiary oxonium salt. In the experiment, the researchers used many compounds, for example, 1-Bromo-6-methoxyhexane (cas: 50592-87-5Quality Control of 1-Bromo-6-methoxyhexane).

1-Bromo-6-methoxyhexane (cas: 50592-87-5) 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. 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.Quality Control of 1-Bromo-6-methoxyhexane

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Tuning the activity of known drugs via the introduction of halogen atoms, a case study of SERT ligands – Fluoxetine and fluvoxamine was written by Staron, Jakub;Pietrus, Wojciech;Bugno, Ryszard;Kurczab, Rafal;Satala, Grzegorz;Warszycki, Dawid;Lenda, Tomasz;Wantuch, Anna;Hogendorf, Adam S.;Hogendorf, Agata;Duszynska, Beata;Bojarski, Andrzej J.. And the article was included in European Journal of Medicinal Chemistry in 2021.Recommanded Product: 4457-67-4 This article mentions the following:

To elucidate the role of halogen atoms in the binding of SSRIs to SERT, a series of 22 fluoxetine and fluvoxamine analogs substituted with fluorine, chlorine, bromine, and iodine atoms, differently arranged on the Ph ring was designed. The obtained biol. activity data, supported by a thorough in silico binding mode anal., allowed the identification of two partners for halogen bond interactions: the backbone carbonyl oxygen atoms of E493 and T497. Addnl., compounds with heavier halogen atoms were found to bind with the SERT via a distinctly different binding mode, a result not presented elsewhere. The subsequent anal. of the prepared XSAR sets showed that E493 and T497 participated in the largest number of formed halogen bonds. The XSAR library anal. led to the synthesis of two of the most active compounds (3,4-diCl-fluoxetine, SERT K_i = 5 nM and 3,4-diCl-fluvoxamine, SERT K_i = 9 nM, fluoxetine SERT K_i = 31 nM, fluvoxamine SERT K_i = 458 nM). An example of the successful use of a rational methodol. was presented to analyze binding and design more active compounds by halogen atom introduction. ‘XSAR library anal.’, a new tool in medicinal chem., was instrumental in identifying optimal halogen atom substitution. In the experiment, the researchers used many compounds, for example, 1-Bromo-4-methoxybutane (cas: 4457-67-4Recommanded Product: 4457-67-4).

1-Bromo-4-methoxybutane (cas: 4457-67-4) belongs to organobromine compounds. Most of the natural organobromine compounds are produced by marine organisms, and several brominated metabolites with antibacterial, antitumor, antiviral, and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. 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.Recommanded Product: 4457-67-4

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Removal of photoredox catalysts from polymers synthesized by organocatalyzed atom transfer radical polymerization was written by Chism, Katherine A.;Corbin, Daniel A.;Miyake, Garret M.. And the article was included in Journal of Polymer Science (Hoboken, NJ, United States) in 2022.Formula: C4H4BrNO2 This article mentions the following:

Organocatalyzed atom transfer radical polymerization (O-ATRP) is a method of producing polymers with precise structures under mild conditions using organic photoredox catalysts (PCs). Due to the unknown toxicity of PCs and their propensity to introduce color in polymers synthesized by this method, removal of the PC from the polymer product can be important for certain applications of polymers produced using O-ATRP. Current purification methods largely rely on precipitation to remove the PC from the polymer, but a more effective and efficient purification method is needed. In this work, an alternative purification method relying on oxidation of the PC to PC^路+ followed by filtration through a plug to remove PC^路+ from the polymer and removal of the volatiles was developed. A range of chem. oxidants and stationary phases were tested for their ability to remove PCs from polymers, revealing chem. oxidation by N-bromosuccinimide followed by a filtration through a silica plug can remove up to 99% of the PC from poly(Me methacrylate). Characterization of the polymer before and after purification demonstrated that polymer mol. weight, dispersity, and chain-end fidelity are not signficantly impacted by this purification method. Finally, this purification method was tested on a range of dihydrophenazine, phenoxazine, dihydroacridines, and phenothiazine PCs, revealing the strength of the chem. oxidant must match the oxidation potential of the PC for effective purification In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Formula: C4H4BrNO2).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon鈥揵romine 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.Formula: C4H4BrNO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of new dinuclear and mononuclear peroxovanadium(V) complexes containing biogenic co-ligands: a comparative study of some of their properties was written by Sarmah, Swapnalee;Kalita, Diganta;Hazarika, Pankaj;Borah, Ruli;Islam, Nashreen S.. And the article was included in Polyhedron in 2004.Recommanded Product: 4-Amino-3-bromophenol This article mentions the following:

Dinuclear peroxo complexes of vanadium, [V₂O₂(O₂)₃(asn)₃]路H₂O (1, asn = asparagine) and [V₂O₂(O₂)₃(gln)₃]路H₂O (2, gln = glutamine) were synthesized from the reaction of V₂O₅ with H₂O₂ and the resp. amino acid ligand at pH 鈭?. Similar reactions conducted at pH 鈭? afforded the monomeric complexes, Na[VO(O₂)₂(asn)]路H₂O (3) and Na[VO(O₂)₂(gln)]路H₂O (4). The compounds were characterized by elemental anal. and spectral studies. In complexes 1 and 2, the two V(V) centers are bridged by a peroxo group and an amino acid ligand occurring as a zwitterion. The monomeric complexes 3 and 4 contain peroxo groups bonded in a side-on fashion and an amino acid co-ligand binding the V(V) center through O (carboxylate) atoms. The complexes 1 and 2 rapidly degraded in aqueous solution with release of O₂ and formation of diperoxovanadate and decavanadate as shown by ⁵¹V NMR spectra whereas complexes 3 and 4 remained stable in solution for over 24 h. Extent and rate of O₂ released from the two types of complexes under the effect of catalase action further evidenced the differences in their V:O₂^2- content and mode of peroxide binding in these species. The 渭-peroxovanadate complexes 1 and 2 instantaneously oxidized bromide to a bromination-competent intermediate in phosphate buffer at physiol. pH, and also efficiently mediated bromination of organic substrates in aqueous-organic media. Complexes 3 and 4 were inactive for bromination under analogous conditions. These findings make the dinuclear complexes 1 and 2 possible candidates of mimic in the action of vanadium in bromoperoxidase. In the experiment, the researchers used many compounds, for example, 4-Amino-3-bromophenol (cas: 74440-80-5Recommanded Product: 4-Amino-3-bromophenol).

4-Amino-3-bromophenol (cas: 74440-80-5) belongs to organobromine compounds. Most of the natural organobromine compounds are produced by marine organisms, and several brominated metabolites with antibacterial, antitumor, antiviral, and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. 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.Recommanded Product: 4-Amino-3-bromophenol

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Heterocycle Annulation of Enolizable Vinyl Quinone Imides. Dihydroquinolines and Quinolines from Thermal 6蟺-Electrocyclizations and Indoles from Photochemical Cyclizations was written by Parker, Kathlyn A.;Mindt, Thomas L.. And the article was included in Organic Letters in 2002.Related Products of 74440-80-5 This article mentions the following:

Enolizable vinyl quinone mono- and diimide substrates I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) undergo cyclization in toluene with HMPA in the dark to provide protected 6-hydroxy and 6-amino dihydroquinolines II (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) in 55-71% yields. Aromatization of I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) provides the corresponding quinolines upon deprotection of the dihydroquinoline nitrogens. The substrates I are prepared from bromophenylenediamines and bromoaminophenols using a Stille coupling to assemble the framework followed by deprotection (if needed) and oxidation to generate the quinone imides. When the quinone monoimides I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O) are stirred in toluene with HMPA under ambient light, the hydroxyindoles III (R = Ac, Me₃SiCH₂CH₂SO₂) are obtained instead in 59-69% yields. In the experiment, the researchers used many compounds, for example, 4-Amino-3-bromophenol (cas: 74440-80-5Related Products of 74440-80-5).

4-Amino-3-bromophenol (cas: 74440-80-5) 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. 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.Related Products of 74440-80-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Multifunctional Two-Dimensional Polymers for Perovskite Solar Cells with Efficiency Exceeding 24% was written by Fu, Qiang;Liu, Hang;Tang, Xingchen;Wang, Rui;Chen, Mingqian;Liu, Yongsheng. And the article was included in ACS Energy Letters in 2022.Recommanded Product: 128-08-5 This article mentions the following:

The passivation of the intrinsic surface defects of perovskites by organic functional materials has a great potential to retard charge recombination and enhance charge extraction However, unsatisfactory device performance and a lack of in-depth understanding of the defect passivation mechanism make rational mol. design for efficient solar cells a great challenge. Herein, two solution-processable two-dimensional (2D) conjugated polymers, namely, 2DP-F and 2DP-O, have been synthesized for perovskite solar cells (PSCs). It is found that these materials could passivate surface defects, transport and extract hole carriers, hamper moisture invasion, and impede diffusion of Li⁺ cations into the perovskite film. As a result, champion efficiencies of 23.31% and 24.08% were achieved for 2DP-F- and 2DP-O-based devices, resp., coupled with dramatically improved stability. These results indicate that our proposed 2D polymers could be promising multifunctional materials for further boosting the efficiency and improving the stability of PSCs. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Recommanded Product: 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) 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. 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.Recommanded Product: 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Desymmetrization of difluoromethylene groups by C-F bond activation was written by Butcher, Trevor W.;Yang, Jonathan L.;Amberg, Willi M.;Watkins, Nicholas B.;Wilkinson, Natalie D.;Hartwig, John F.. And the article was included in Nature (London, United Kingdom) in 2020.Application of 83902-02-7 This article mentions the following:

Tertiary stereogenic centers containing one fluorine atom are valuable for medicinal chem. because they mimic common tertiary stereogenic centers containing one hydrogen atom, but they possess distinct charge distribution, lipophilicity, conformation and metabolic stability^1-3. Although tertiary stereogenic centers containing one hydrogen atom are often set by enantioselective desymmetrization reactions at one of the two carbon-hydrogen (C-H) bonds of a methylene group, tertiary stereocenters containing fluorine have not yet been constructed by the analogous desymmetrization reaction at one of the two carbon-fluorine (C-F) bonds of a difluoromethylene group³. Fluorine atoms are similar in size to hydrogen atoms but have distinct electronic properties, causing C-F bonds to be exceptionally strong and geminal C-F bonds to strengthen one another⁴. Thus, exhaustive defluorination typically dominates over the selective replacement of a single C-F bond, hindering the development of the enantioselective substitution of one fluorine atom to form a stereogenic center^5,6. Here the authors report the catalytic, enantioselective activation of a single C-F bond in an allylic difluoromethylene group to provide a broad range of products containing a monofluorinated tertiary stereogenic center. By combining a tailored chiral iridium phosphoramidite catalyst, which controls regioselectivity, chemoselectivity and enantioselectivity, with a fluorophilic activator, which assists the oxidative addition of the C-F bond, these reactions occur in high yield and selectivity. The design principles proposed in this work extend to palladium-catalyzed benzylic substitution, demonstrating the generality of the approach. In the experiment, the researchers used many compounds, for example, 2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7Application of 83902-02-7).

2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Application of 83902-02-7

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Features of molecular bromination of aromatic amines was written by Salahov, M. S.;Bagmanov, B. T.;Mustafayeva, F. A.. And the article was included in Azerbaidzhanskii Khimicheskii Zhurnal in 2014.Recommanded Product: 74440-80-5 This article mentions the following:

The peculiarities of mol. bromination of o-, m-, p-substituted anilines in organic media (CHCl₃, CCl₄) and phys.-chem. characteristics of the prepared substances (mono-, di-, tri-, and tetrabromoanilines) reflecting their composition and structure are presented. In the experiment, the researchers used many compounds, for example, 4-Amino-3-bromophenol (cas: 74440-80-5Recommanded Product: 74440-80-5).

4-Amino-3-bromophenol (cas: 74440-80-5) 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. 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.Recommanded Product: 74440-80-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Expedient synthesis of gem-dialkylbenzyl heterocycles through olefinic hydroarylation was written by Lian, Yajing;Burford, Kristen;Londregan, Allyn T.. And the article was included in Tetrahedron in 2015.Computed Properties of C3H4BrN3 This article mentions the following:

A robust approach to gem-dialkylbenzyl heterocycles has been developed through a triflic acid-catalyzed hydroarylation of olefinic heterocycles. A broad range of substrates containing pyridine, quinoline, pyrazole, triazole and imidazole moieties are shown to be highly compatible with this method. This rapid construction of gem-dialkyl groups should be useful in the synthesis of drug-like mols. containing heterocyclic diversity and in the study of the gem-dialkyl effect. In the experiment, the researchers used many compounds, for example, 4-Bromo-1-methyl-1H-1,2,3-triazole (cas: 13273-53-5Computed Properties of C3H4BrN3).

4-Bromo-1-methyl-1H-1,2,3-triazole (cas: 13273-53-5) 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. 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.Computed Properties of C3H4BrN3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Studies of Substituents Impact on the Photophysical Properties of 8-Hydroxyquinoline Derivatives was written by Gao, Li-Bin;Kang, Wu-Kui;Yan, Shi-Hai;Yang, Chun-Peng. And the article was included in Heteroatom Chemistry in 2016.SDS of cas: 18791-79-2 This article mentions the following:

Five new 8-hydroxyquinoline derivatives L1-L5 were synthesized and characterized by different techniques, such as NMR, electrospray ionization mass spectra, elemental anal., UV-visible, and photoluminescence spectra. The structure of (E)-2-{2-[5-(phenylethynyl) thiophen-2-yl]ethenyl}quinolin-8-ol (L3) was confirmed by x-ray crystallog. In this structure, intermol. hydrogen bonds were found between OH hydrogen donors of one monomer and the oxygen atom of the next one. Photophys. studies show that different substitutes affect the absorption wavelength and emission color. In the experiment, the researchers used many compounds, for example, 5-Bromothiophene-3-carbaldehyde (cas: 18791-79-2SDS of cas: 18791-79-2).

5-Bromothiophene-3-carbaldehyde (cas: 18791-79-2) 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. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. SDS of cas: 18791-79-2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary