Category: bromides-buliding-blocks

Mn-mediated reductive C(sp³)-Si coupling of activated secondary alkyl bromides with chlorosilanes was written by Qi, Liangliang;Pang, Xiaobo;Yin, Kai;Pan, Qiu-Quan;Wei, Xiao-Xue;Shu, Xing-Zhong. And the article was included in Chinese Chemical Letters in 2022.Recommanded Product: 1-Bromo-4-methoxybutane This article mentions the following:

Reductive coupling of activated secondary alkyl halides FG-CHXR¹ (FG = phosphinyl, sulfonyl; R¹ = Me, Et, PhCH₂CH₂, C₆H₁₃) with chlorosilane ClSiMe₂(CH:CH₂) mediated by manganese metal afforded secondary alkylsilanes FG-CH(R¹)SiMe₂(CH:CH₂) with high yields. The construction of secondary alkylsilanes is a challenging subject in the synthetic community. The cross-coupling provides a practical solution to address this problem, but it typically relies on organometallic species. Herein, we report an Mn-mediated reductive C(sp³)-Si coupling to synthesize these compounds from alkyl and silyl electrophiles. This approach avoids the requirement for activation of Si-Cl by transition metals and thus allows for the coupling of various common chlorosilanes. The reaction proceeds under mild conditions and shows good functional group compatibility. The method offers access to α-silylated organophosphorus and sulfones with a scope that is complementary to those obtained from the established methods. In the experiment, the researchers used many compounds, for example, 1-Bromo-4-methoxybutane (cas: 4457-67-4Recommanded Product: 1-Bromo-4-methoxybutane).

1-Bromo-4-methoxybutane (cas: 4457-67-4) 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. 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: 1-Bromo-4-methoxybutane

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

High-performance thin-layer chromatography in combination with an acetylcholinesterase-inhibition bioassay with pre-oxidation of organothiophosphates to determine neurotoxic effects in storm, waste, and surface water was written by Baetz, Nicolai;Schmidt, Torsten C.;Tuerk, Jochen. And the article was included in Analytical and Bioanalytical Chemistry in 2022.SDS of cas: 128-08-5 This article mentions the following:

Pesticides such as organothiophosphates (OTPs) are neurotoxically active and enter the aquatic environment. Bioassays, using acetylcholinesterase (AChE), a suitable substrate and reactant, can be applied for the photometric detection of AChE-inhibiton (AChE-I) effects. The oxidized forms of OTPs, so-called oxons, have higher inhibition potentials for AChE. Therefore, a higher sensitivity is achieved for application of oxidized samples to the AChE assay. In this study, the oxidation of malathion, parathion, and chlorpyrifos by n-bromosuccinimide (NBS) was investigated in an approach combining high-performance thin-layer chromatog. (HPTLC) with an AChE-I assay. Two AChE application approaches, immersion and spraying, were compared regarding sensitivity, precision, and general feasibility of the OTP effect detection. The oxidation by NBS led to an activation of the OTPs and a strong increase in sensitivity similar to the oxons tested. The sensitivity and precision of the two application techniques were similar, although the spray method was slightly more sensitive to the oxidized OTPs. The 10% inhibition concentrations (IC10) for the spray approach were 0.26, 0.75, and 0.35 ng/spot for activated malathion, parathion, and chlorpyrifos, resp. AChE-I effect recoveries in samples from a stormwater retention basin and receiving stream were between 69 and 92% for malathion, parathion, and chlorpyrifos. The overall workflow, including sample enrichment by solid-phase extraction, HPTLC, oxidation of OTPs, and AChE-I assay, was demonstrated to be suitable for the detection of AChE-I effects in native water samples. An effect of unknown origin was found in a sample from a stormwater retention basin. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5SDS of cas: 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) 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. 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.SDS of cas: 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Scandium-bipyridine-catalyzed enantioselective aminolysis of meso-epoxides was written by Mai, Enzo;Schneider, Christoph. And the article was included in Chemistry – A European Journal in 2007.Safety of Isopentyltriphenylphosphonium bromide This article mentions the following:

The scandium-bipyridine-catalyzed enantioselective addition of anilines and O-alkyl hydroxylamines to meso-epoxides has been optimized and extended to a broad range of epoxides and amines. Whereas aromatic meso-epoxides generally furnished the corresponding 1,2-amino alcs., e.g., I, in excellent enantioselectivities, aliphatic meso-epoxides only gave rise to moderate enantioselectivities in the aminolysis. The catalyst loading may be lowered to just 5 mol% with only marginal effects on yield and enantioselectivity. A strong pos. nonlinear effect has been observed, pointing to aggregation phenomena of the catalyst. In the experiment, the researchers used many compounds, for example, Isopentyltriphenylphosphonium bromide (cas: 28322-40-9Safety of Isopentyltriphenylphosphonium bromide).

Isopentyltriphenylphosphonium bromide (cas: 28322-40-9) 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). 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.Safety of Isopentyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

A simple and efficient in situ generated ruthenium catalyst for chemoselective transfer hydrogenation of nitroarenes: kinetic and mechanistic studies and comparison with iridium systems was written by Paul, Bhaskar;Chakrabarti, Kaushik;Shee, Sujan;Maji, Milan;Mishra, Anju;Kundu, Sabuj. And the article was included in RSC Advances in 2016.Safety of 2-Bromo-1,10-phenanthroline This article mentions the following:

The catalytic activities of a series of in-situ generated homogeneous ruthenium systems based on com. available [RuCl₂(p-cymene)]₂ and various ligands in transfer hydrogenation of nitroarenes to anilines were investigated. Combination of [RuCl₂(p-cymene)]₂ and tridentate phenanthroline based ligand 2-(6-methoxypyridin-2-yl)-1,10-phenanthroline (phenpy-OMe) exhibited the highest catalytic activity for this reaction using 2-propanol as hydrogen source. This protocol provided a facile route to access aromatic amines under mild conditions in excellent yields. Notably, this system chemoselectively reduced the nitro groups over an array of other reactive functionalities such as ketone, alkene, amide, nitrile, and aryl halide. Operational simplicity, high yields, mild reaction conditions and short reaction times make this an attractive methodol. for accessing various functionalized anilines. A series of controlled experiments and careful mechanistic investigation with the possible intermediates suggested that transformation of nitrobenzene to aniline with ruthenium and iridium system proceeded via direct route and condensation route resp. In the experiment, the researchers used many compounds, for example, 2-Bromo-1,10-phenanthroline (cas: 22426-14-8Safety of 2-Bromo-1,10-phenanthroline).

2-Bromo-1,10-phenanthroline (cas: 22426-14-8) 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. 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.Safety of 2-Bromo-1,10-phenanthroline

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Nickel-Catalyzed Reductive Cross-Coupling of Alkyl Bromides and Chlorosilanes was written by Xing, Mimi;Cui, Huanhuan;Zhang, Chun. And the article was included in Organic Letters in 2021.Synthetic Route of C10H13BrO This article mentions the following:

A novel nickel-catalyzed highly selective reductive cross-coupling of alkyl bromides and chlorosilanes to construct the C-Si bond has been developed. Under benign reaction conditions, a series of structurally interesting organosilanes can be accessed without Ni-catalyzed isomerization. The utility of this chem. is illustrated by further transformations of the product. Moreover, the radical mechanism of the reaction is illustrated by control experiments In the experiment, the researchers used many compounds, for example, 1-(3-Bromopropyl)-4-methoxybenzene (cas: 57293-19-3Synthetic Route of C10H13BrO).

1-(3-Bromopropyl)-4-methoxybenzene (cas: 57293-19-3) 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. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Synthetic Route of C10H13BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Central cholinergic agents. I. Potent acetylcholinesterase inhibitors, 2-[ω-[N-alkyl-N-(ω-phenylalkyl)amino]alkyl]-1H-isoindole-1,3(2H)-diones, based on a new hypothesis of the enzyme’s active site was written by Ishihara, Yuji;Kato, Koki;Goto, Giichi. And the article was included in Chemical & Pharmaceutical Bulletin in 1991.Category: bromides-buliding-blocks This article mentions the following:

It has been suggested that the active site of acetylcholinesterase contains a hydrophobic binding site (HBS-1), which is closely adjacent to both the anionic and the esteratic sites. In this paper, we assumed that there exists another hydrophobic binding site (HBS-2), some distance removed from the anionic site. On this assumption, a new working hypothesis was proposed for the design of acetylcholinesterase inhibitors. A series of 2-[ω-[N-alkyl-N-(ω-phenylalkyl)amino]alkyl]-1H-isoindole-1,3(2H)-diones (I, X = e.g., O₂N, OH, Me, Cl, amino group, or COPh, Y = e.g., H, halo OMe, R = H or alkyl, n = 3-9, m = 1-4) was designed based on this hypothesis and tested for its inhibitory activities on acetylcholinesterase. Some in this series were revealed to be more potent than physostigmine. Optimum activity was found to be associated with a five carbon chain length separating the benzylamino group from the 1H-isoindole-1,3(2H)-dione (phthalimide) moiety. Quant. study of substitution effect on the phthalimide moiety revealed that hydrophilic and electron-withdrawing groups enhance the activity. In the experiment, the researchers used many compounds, for example, N-(5-Bromopentyl)phthalimide (cas: 954-81-4Category: bromides-buliding-blocks).

N-(5-Bromopentyl)phthalimide (cas: 954-81-4) 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. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The hydrolysis of carboxylic anhydrides. IV. Succinic and tetramethylsuccinic anhydrides was written by Bunton, C. A.;Fendler, J. H.;Fuller, N. A.;Perry, S.;Rocek, J.. And the article was included in Journal of the Chemical Society in 1963.Related Products of 2178-24-7 This article mentions the following:

Hydrolysis of succinic and tetramethylsuccinic anhydride is retarded by aqueous mineral acids (except for dilute H₂SO₄ and HCl). It is acid-catalyzed in aqueous dioxane. Hydrolysis of succinic anhydride in water is accelerated by bivalent electrolytes, but retarded by univalent electrolytes (except for NaHSO₄). In water the feeble catalysis by protons is opposed by a sp. neg. salt effect, but the rate in aqueous acid is always greater than that in solutions of the alkali-metal salts. In the experiment, the researchers used many compounds, for example, Ethyl (2-bromophenyl)acetate (cas: 2178-24-7Related Products of 2178-24-7).

Ethyl (2-bromophenyl)acetate (cas: 2178-24-7) 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. 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.Related Products of 2178-24-7

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The first chiral HPLC separation of dicarba-nido-undecarborate anions and their chromatographic behavior was written by Horacek, Ondrej;Papajova-Janetkova, Monika;Gruner, Bohumir;Lochman, Lukas;Sterbova-Kovarikova, Petra;Vespalec, Radim;Kucera, Radim. And the article was included in Talanta in 2021.Recommanded Product: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin This article mentions the following:

Boron cluster compounds are extensively studied due to their possible use in medicinal chem., mainly in the boron neutron capture anticancer therapy and as new innovative pharmacophores. Concerning this research, the chiral separations of exceptionally stable anionic 7,8-dicarba-nido-undecaborate(1-) and metal bis(dicarbollide)(1-) derivatives with asym. substitutions remain the unsolved challenge of the chiral chromatog. nowadays. Although the successful enantioseparation of some anionic 7,8-dicarba-nido-undecaborate(1-) ion derivatives were achieved in CZE with native β-cyclodextrins, it has not been observed with HPLC, yet. This study aimed to systematically investigate the enantioseparation of selected compounds in HPLC using native β-cyclodextrin and brominated β-cyclodextrin. The findings revealed pos. charged strong adsorption sites on a stationary phase, identified as the cationic metal impurities in the silica-gel backbone. All the anionic species under the study were at least partially enantiosepd. when a chelating agent blocked these cationic sites. Consequently, the first-ever HPLC enantioseparations of the 7,8-dicarba-nido-undecaborates(1-) were achieved. The brominated β-cyclodextrin seemed to be a better chiral selector for separation of these species, whereas the native β-cyclodextrin separated the anionic cobalt bisdicarbollide(1-). The results of this study bring new information concerning the chiral separation of anionic boron clusters and might be used in the chiral method development process on other chiral selectors. Furthermore, the possibility of chiral separation of these species could influence the ongoing research areas of anionic boron clusters. In the experiment, the researchers used many compounds, for example, Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin (cas: 53784-83-1Recommanded Product: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin).

Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin (cas: 53784-83-1) 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. The principal reactions for organobromides include dehydrobromination, Grignard reactions, reductive coupling, and nucleophilic substitution.Recommanded Product: Heptakis(6-Bromo-6-Deoxy)-β-Cyclodextrin

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Copper-catalyzed endo-type trifluoromethylarylation of alkynes was written by Xu, Jun;Wang, Yun-Long;Gong, Tian-Jun;Xiao, Bin;Fu, Yao. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2014.Product Details of 14425-64-0 This article mentions the following:

A new copper-catalyzed trifluoromethylarylation reaction of alkynes has been developed. The transformation represents the first example of endo-type carbotrifluoromethylation of unsaturated carbon-carbon bonds and provides efficient access to a variety of CF₃-substituted dihydronaphthalenes and chromenes. In the experiment, the researchers used many compounds, for example, 1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0Product Details of 14425-64-0).

1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0) 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.Product Details of 14425-64-0

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Nickel-catalyzed migratory alkyl-alkyl cross-coupling reaction was written by Li, Yangyang;Li, Yuqiang;Peng, Long;Wu, Dong;Zhu, Lei;Yin, Guoyin. And the article was included in Chemical Science in 2020.SDS of cas: 14425-64-0 This article mentions the following:

A migratory cross-coupling strategy, which can overcome this obstacle to access the desired cross-coupling products ArCH(R)(CH₂)_nCR¹R²R³ (Ar = Ph, 4-fluorophenyl, indol-3-yl, etc.; R = cyclopentyl, cyclohexyl, cycloheptyl, N-benzyl-piperidin-4-yl, 2-methyl-propan-1-yl; R¹ = H, D; R² = H, D; R³ = H; n = 0-3, 5), 1-cyclopentyl-indan, 1-cycloheptyl-indan, (1-cyclopentyl-3-methyl-pentyl)benzene was described. Accordingly, a selective migratory cross-coupling of two alkyl electrophiles (RBr, ArCH(R)(CH₂)_nCR¹R²R³ (R³ = Br or Cl), 2-bromoindan, (5-bromo-1-cyclopentyl-3-methyl-pentyl)benzene) has been accomplished by nickel catalysis. Remarkably, this alkyl-alkyl cross-coupling reaction provides a platform to prepare 2°-2° carbon-carbon bonds from 1° and 2° carbon coupling partners. Preliminary mechanistic studies suggest that chain-walking occurs at both alkyl halides in this reaction, thus a catalytic cycle with the key step involving two alkylnickel(II) species is proposed for this transformation. In the experiment, the researchers used many compounds, for example, 1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0SDS of cas: 14425-64-0).

1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0) 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. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.SDS of cas: 14425-64-0

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary