Tag: 300-400

The author of 《Ladderization of polystyrene derivatives by palladium-catalyzed polymer direct arylation》 were Takagi, Koji; Tanaka, Hidetoshi; Mikami, Koichiro. And the article was published in Polymer Chemistry in 2019. SDS of cas: 1779-49-3 The author mentioned the following in the article:

Ladderization of polystyrene derivatives successfully proceeded by palladium-catalyzed polymer direct arylation in the presence of a phosphine ligand and pivalic acid using poly(2-bromostyrene) as a prepolymer, in which the polymer tacticity had little influence on the reaction efficiency. The reaction mechanism was supported by theor. calculation in detail. The optical and thermal properties of pseudo-ladderized polystyrene suggested enhanced chain rigidity. The experimental process involved the reaction of Methyltriphenylphosphonium bromide(cas: 1779-49-3SDS of cas: 1779-49-3)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.SDS of cas: 1779-49-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Electric Literature of C20H20BrPIn 2021 ,《Regio-regular poly(thienylene vinylene)s (rr-PTVs) through acyclic diene metathesis (ADMET) polymerization and the impact of alkyl side-chains on polymer molecular weight and solubility》 appeared in Polymer. The author of the article were Katba-Bader, Yousef M.; Meng, Lingyao; Guan, Chao; Qin, Yang. The article conveys some information:

Poly(thienylene vinylene) (PTV) is one of the prototypical conjugated polymers (CPs) that has received relatively little attention. The insertion of one small double bond between every pair of adjacent thiophene units in PTV structures potentially allow direct functionalization of the thienyl rings, which can fine-tune polymer electronic properties without significantly impact main-chain planarity. However, synthetic methods leading to such tailor-designed PTVs are scarce. In this paper, we report a new synthetic strategy that produces a series of regio-regular (rr) PTVs bearing bromine atoms and different alkyl side-chains on every thiophene unit. The methodol. starts with synthesis of well-defined dimeric monomers that lead to rr-PTVs upon ADMET polymerization The monomers and polymers are fully characterized by NMR and absorption spectroscopy. We found that linear and slightly branched alkyl chains led to precipitation during the polymerization process and thus low apparent mol. weight due to limited polymer solubility, while long-branched and bulky silyl-alkyl ether chains led to PTVs with greater solubility and higher mol. weights After reading the article, we found that the author used Ethyltriphenylphosphonium bromide(cas: 1530-32-1Electric Literature of C20H20BrP)

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. CatOnium ETPB is also used as catalysts in the synthesis of certain organic compounds.Electric Literature of C20H20BrP

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2022,Duan, Shengzu; Zi, Yujin; Wang, Lingling; Cong, Jielun; Chen, Wen; Li, Minyan; Zhang, Hongbin; Yang, Xiaodong; Walsh, Patrick J. published an article in Chemical Science. The title of the article was 《α-Branched amines through radical coupling with 2-azaallyl anions, redox active esters and alkenes》.Related Products of 1530-32-1 The author mentioned the following in the article:

Herein, a unique cascade reaction that enables the preparation of α-branched amines I (R = Me, Ad, oxan-4-ylmethyl, etc.; R1 = H, Me, Ph; R2 = Ph; R1R2 = -(CH2)2CH(Ph)(CH2)2-; R3 = H, Me; R4 = Ph, 4-chlorophenyl, furan-3-yl, etc.) and 3-methyl-1,2,2-triphenylpentan-1-amine bearing aryl or alkyl groups at the β- or γ-positions is reported. The cascade is initiated by reduction of redox active esters II to alkyl radicals. The resulting alkyl radicals are trapped by styrene derivatives, R1C(R2)=CHR3 leading to benzylic radicals. The persistent 2-azaallyl radicals and benzylic radicals are proposed to undergo a radical-radical coupling leading to functionalized amine products I and 3-methyl-1,2,2-triphenylpentan-1-amine. Evidence is provided that the role of the nickel catalyst is to promote formation of the alkyl radical from the redox active ester and not promote the C-C bond formation. The synthetic method introduced herein tolerates a variety of imines III and redox active esters II, allowing for efficient construction of amine building blocks. The experimental part of the paper was very detailed, including the reaction process of Ethyltriphenylphosphonium bromide(cas: 1530-32-1Related Products of 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. CatOnium ETPB is also used as catalysts in the synthesis of certain organic compounds.Related Products of 1530-32-1

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

In 2018,Nishimoto, Yoshihiro; Yi, Junyi; Takata, Tatsuaki; Baba, Akio; Yasuda, Makoto published 《Regio- and stereoselective allylindation of alkynes using InBr3 and allylic silanes: synthesis, characterization, and application of 1,4-dienylindiums toward skipped dienes》.Molecules published the findings.Electric Literature of Br3In The information in the text is summarized as follows:

Regioselective anti-allylindation of alkynes was achieved using InBr3 and allylic silanes. Various types of alkynes and allylic silanes were applicable to the present allylindation. This sequential process used the generated 1,4-dienylindiums to establish novel synthetic methods for skipped dienes. The 1,4-dienylindiums were characterized by spectral anal. and treated with I2 to stereoselectively give 1-iodo-1,4-dienes. The Pd-catalyzed cross coupling of 1,4-dienylindium with iodobenzene successfully proceeded in a one-pot manner to afford the corresponding 1-aryl-1,4-diene. In the experiment, the researchers used Indium(III) bromide(cas: 13465-09-3Electric Literature of Br3In)

Indium(III) bromide(cas: 13465-09-3) is used in organic synthesis as a water tolerant Lewis acid. It efficiently catalyzes the three-component coupling of β-keto esters, aldehydes and urea (or thiourea) to afford the corresponding dihydropyrimidinones.Electric Literature of Br3In

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Related Products of 523-27-3In 2022 ,《Fluorescent Nanofibers Self-assembled from a Diphenylanthracene Scissor-shaped Dyad》 was published in Chemistry Letters. The article was written by Suda, Natsuki; Arima, Hironari; Saito, Takuho; Aizawa, Takumi; Yagai, Shiki. The article contains the following contents:

A scissor-shaped foldable diphenylanthracene dyad has been synthesized and found to self-assemble in a nonpolar solvent into elongated thin nanofibers, showing intense blue emission. At a millimolar concentration, efficient gelation was observed while the emission property of the building block was retained in the gel state. The results came from multiple reactions, including the reaction of 9,10-Dibromoanthracene(cas: 523-27-3Related Products of 523-27-3)

9,10-Dibromoanthracene(cas: 523-27-3) is a dibrominated polycyclic aromatic hydrocarbon (PAH). 9,10-Dibromoanthracene is often used as an energy acceptor and activator in reactions that produce chemiluminescence.Related Products of 523-27-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Acceptor-density engineering of push-pull typed carbazole derivatives for improving luminescent efficiency and mechanoresponsive luminescence》 was published in Journal of Luminescence in 2020. These research results belong to Li, Jie; Yin, Xiangkai; Xia, Yan; Fan, Congcong; Xie, Jingjuan; Wu, Yuling; Guo, Kunpeng. Application of 6825-20-3 The article mentions the following:

Improving luminous efficiency and mechanoresponsive luminescent (MRL) performance are significant issues in developing functional fluorescent materials. Herein, three push-pull typed carbazole derivatives with similar building blocks but differing in 2-vinylphenylmalononitrile acceptor numbers form mono- (m-VPMCz) to bis- (b-VPMCz) and tetra- (t-VPMCz) were designed and synthesized. Their luminescent properties in solution and aggregate states, as well as MRL performance were investigated. It was demonstrated that t-VPMCz with the highest acceptor-d. and a highly twisted configuration achieved the highest luminescent efficiency in both solution and aggregation. B-VPMCz adopting a moderately twisted structure with two acceptor units exhibited the most remarkable MRL performance accompanied with the most distinct phase transition upon grinding. Our results suggest that rational control over the acceptor-d. on push-pull typed mols. would be a promising way for realizing advanced functional fluorescent materials. The experimental process involved the reaction of 3,6-Dibromo-9H-carbazole(cas: 6825-20-3Application of 6825-20-3)

3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a reagent in the synthesis of P7C3-A20 which is a potent neuroprotective agent. And it has been used in the preparation of N-(2-hydroxyethyl)-3,6-dibromocarbazole.Application of 6825-20-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Nickel-catalyzed anti-Markovnikov hydroarylation of unactivated alkenes with unactivated arenes facilitated by non-covalent interactions》 was published in Nature Chemistry in 2020. These research results belong to Saper, Noam I.; Ohgi, Akito; Small, David W.; Semba, Kazuhiko; Nakao, Yoshiaki; Hartwig, John F.. Safety of Methyltriphenylphosphonium bromide The article mentions the following:

Abstract: Anti-Markovnikov additions to alkenes have been a longstanding goal of catalysis, and anti-Markovnikov addition of arenes to alkenes would produce alkylarenes that are distinct from those formed by acid-catalyzed processes. Existing hydroarylations are either directed or occur with low reactivity and low regioselectivity for the n-alkylarene. Herein, we report the first undirected hydroarylation of unactivated alkenes with unactivated arenes that occurs with high regioselectivity for the anti-Markovnikov product. The reaction occurs with a nickel catalyst ligated by a highly sterically hindered N-heterocyclic carbene. Catalytically relevant arene- and alkene-bound nickel complexes have been characterized, and the rate-limiting step was shown to be reductive elimination to form the C-C bond. D. functional theory calculations, combined with second-generation absolutely localized MO energy decomposition anal., suggest that the difference in activity between catalysts containing large and small carbenes results more from stabilizing intramol. non-covalent interactions in the secondary coordination sphere than from steric hindrance. The first undirected hydroarylation of unactivated alkenes RCH=CHR1 (R = C8H17, cyclohexyl, C(CH3)3, etc.; R1 = H, CH3, C2H5, C3H7) with unactivated arenes R2C6H5 (R2 = 3-CH3, 3,4-(CH3)2, 3,5-(CF3)2, etc.) occurs with high regioselectivity for the anti-Markovnikov product, e.g., I. The reaction occurs with a Ni catalyst ligated by a highly sterically hindered N-heterocyclic carbene (NHC). Catalytically relevant arene- and alkene-bound Ni complexes have been characterized, and the rate-limiting step was shown to be reductive elimination to form the C-C bond. DFT calculations, combined with energy decomposition anal. (EDA), suggest that the difference in activity between catalysts containing large and small carbenes results more from stabilizing intramol., non-covalent interactions in the secondary coordination sphere than from steric hindrance. In addition to this study using Methyltriphenylphosphonium bromide, there are many other studies that have used Methyltriphenylphosphonium bromide(cas: 1779-49-3Safety of Methyltriphenylphosphonium bromide) was used in this study.

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is used for methylenation through the Wittig reaction. It is utilized in the synthesis of an enyne and 9-isopropenyl -phenanthrene by using sodium amide as reagent. Safety of Methyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Investigation of the features in living anionic polymerization with styrene derivatives containing annular substituents》 were Bai, Hongyuan; Zhang, Zhi; Ma, Hongwei; Han, Li; Mu, Xiaochun; Huang, Wei; Liu, Pibo; Wu, Yibo. And the article was published in Polymer Chemistry in 2019. Recommanded Product: 1779-49-3 The author mentioned the following in the article:

Five styrene derivatives with annular substituents (SAs), called (1-cyclopentylvinyl)benzene (CPBE), (1-cyclohexylvinyl)benzene (CHBE), 1-methylene-1,2,3,4-tetrahydronaphthalene (THNE), 5-methylene-6,7,8,9-tetrahydro-5H-benzo[7]annulene (THBE) and 4-methylenethiochromane (META), were successfully synthesized and living anionic polymerization was conducted. Among these SAs, CPBE and CHBE possessed dissociative cycloparaffins as the α-substituent in the styrene structure, while THNE and THBE exhibited vinyl-substituted benzo-cycloalkanes. Addnl., the META monomer showed a similar structure to that of THNE, but with a sulfur atom in the benzo-cycloalkane. Due to the presence of bulky cyclic structures in these mols., similar non-homopolymerization characteristics, such as is the case of 1,1-diphenylethylene (DPE) derivatives, were discovered during living anionic polymerization (LAP). Thus, the living anionic copolymerization of these SAs with styrene (St) was performed to investigate their specific features. All of the copolymers exhibited narrow polydispersity, without any unexpected side-reaction over multiple variations in the reaction conditions. The investigations of their features in living anionic copolymerization of these five SAs showed that CPBE and CHBE were difficult to incorporate into chains, THNE and THBE exhibited relatively higher reactivity than the above two, while META presented the highest reactivity (rSt = 2.6) among the five SAs. Meanwhile, d. functional theor. (DFT) calculations were used to simulate the optimal structures of these SAs and to theor. understand the differences in their reactivity. Based on the actual results of the specific features of the SAs, it is possible to explore new monomers for further synthesis of sequence-controlled polymers using the living anionic polymerization strategy. Furthermore, this new insight into a monomer synthetic strategy can be expanded for subsequent sequence control and tailoring of the polymer properties. In the experimental materials used by the author, we found Methyltriphenylphosphonium bromide(cas: 1779-49-3Recommanded Product: 1779-49-3)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.Recommanded Product: 1779-49-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Monsigny, Louis; Cejas Sanchez, Joel; Piatkowski, Jakub; Kajetanowicz, Anna; Grela, Karol published their research in Organometallics in 2021. The article was titled 《Synthesis and Catalytic Properties of a Very Latent Selenium-Chelated Ruthenium Benzylidene Olefin Metathesis Catalyst》.Safety of Ethyltriphenylphosphonium bromide The article contains the following contents:

Herein, authors describe a study of the synthesis, characterization, and catalytic properties of a cis-dichlorido seleno-chelated Hoveyda-Grubbs type complex (Ru8). Such a complex has been obtained through a straightforward and high-yielding synthetic protocol in three steps from the com. available 2-bromobenzaldehyde in good overall yield (54%). The catalytic profile, especially the latency of this complex, has been probed through selected olefin metathesis reactions such as ring-closing metathesis (RCM), self-cross-metathesis (self-CM) and ring-opening metathesis polymerization (ROMP). In addition to its high latency, the selenium Hoveyda-type complex Ru8 exhibits a switchable behavior upon thermal activation. Of interest, while the corresponding sulfur-chelated Hoveyda type catalyst is reported to be only activated by heat, the selenium analog was active upon both heat and light irradiation The results came from multiple reactions, including the reaction of Ethyltriphenylphosphonium bromide(cas: 1530-32-1Safety of Ethyltriphenylphosphonium bromide)

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.Safety of Ethyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary