- The Concept of Photozymes: Short Peptides with Photoredox Catalytic Activity for Nucleophilic Additions to α-Phenyl Styrenes
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Conventional photoredox catalytic additions of alcohols to olefins require additives, like thiophenol, to promote back electron transfer. The concept of “photozymes” assumes that forward and backward electron transfer steps in a photoredox catalytic cycle
- Sack, Daniel,Wagenknecht, Hans-Achim
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p. 6400 - 6407
(2021/11/18)
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- Bisoxazoline-pincer ligated cobalt-catalyzed hydrogenation of alkenes
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The efficient and atom economical hydrogenation of alkenes using a novel bisoxazoline ligated cobalt complex has been developed. The hydrogenation of a variety of alkenes containing electron neutral and electron-donating groups proceeds in high yield, whi
- Ritz, Mikhaila D.,Parsons, Astrid M.,Palermo, Philip N.,Jones, William D.
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supporting information
(2020/02/13)
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- Nickel-Catalyzed Direct Synthesis of Aryl Olefins from Ketones and Organoboron Reagents under Neutral Conditions
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Nickel-catalyzed addition of arylboron reagents to ketones results in aryl olefins directly. The neutral condition allows acidic protons of alcohols, phenols, and malonates to be present, and fragile structures are also tolerated.
- Lei, Chuanhu,Yip, Yong Jie,Zhou, Jianrong Steve
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supporting information
p. 6086 - 6089
(2017/05/08)
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- Branched Arylalkenes from Cinnamates: Selectivity Inversion in Heck Reactions by Carboxylates as Deciduous Directing Groups
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A decarboxylative Mizoroki–Heck coupling of aryl halides with cinnamic acids has been developed in which the carboxylate group directs the arylation into its β-position before being tracelessly removed through protodecarboxylation. In the presence of a copper/palladium catalyst, both electron-rich and electron-deficient aryl bromides and chlorides bearing numerous functionalities were successfully coupled with broadly available cinnamates, with selective formation of 1,1-disubstituted alkenes. This reaction concept, in which the carboxylate acts as a deciduous directing group, ideally complements traditional 1,2-selective Heck reactions of styrenes.
- Tang, Jie,Hackenberger, Dagmar,Goossen, Lukas J.
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supporting information
p. 11296 - 11299
(2016/10/13)
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- Microwave-assisted, Pd(0)-catalyzed cross-coupling of diazirines with aryl halides
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Pd(0)-catalyzed cross-coupling reactions of diazirines with aryl halides under microwave heating conditions afford a series of substituted olefins. A reaction mechanism involving the migratory insertion of the Pd carbene intermediate is proposed.
- Zhao, Xia,Wu, Guojiao,Yan, Chong,Lu, Kui,Li, Hui,Zhang, Yan,Wang, Jianbo
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supporting information; experimental part
p. 5580 - 5583
(2011/02/23)
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- Charge-transfer interactions in 4-donor 4′-acceptor substituted 1,1-diphenylethenes
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Two 1,1-diphenylethenes bearing either a 4-dimethylamino or 4-methoxy group as electron donor and a 4′-cyano group as electron acceptor, as well as compounds containing only a donor or acceptor functionality, were synthesized. The observation of strong fl
- Van Walree, Cornelis A.,Kaats-Richters, Veronica E. M.,Veen, Sandra J.,Wieczorek, Birgit,Van Der Wiel, Johanna H.,Van Der Wiel, Bas C.
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p. 3046 - 3056
(2007/10/03)
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- Synthesis of polysubstituted alkenes by Heck vinylation or Suzuki cross-coupling reactions in the presence of a tetraphosphane-palladium catalyst
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Through the use of [PdCl(C3H5)]2/cis,cis,cis-1,2,3, 4-tetrakis[(diphenylphosphanyl)methyl]cyclopentane as a catalyst, a range of vinyl bromides undergo Suzuki cross-couplings with arylboronic acids in good yields. Furthermore, the catalyst can be used at low loadings, even for reactions of sterically hindered substrates. Mediated by this catalyst, stilbene and 1,1-diphenylethylene undergo Heck reactions with aryl halides to give triarylethylene derivatives. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
- Berthiol, Florian,Doucet, Henri,Santelli, Maurice
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p. 1091 - 1096
(2007/10/03)
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- Leuco dyes and recording material employing the same
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Leuco dyes of the formula (I) are disclosed, STR1 wherein R1, R2, R3 and R4 each represent an alkyl group having 1 to 10 carbon atoms; X represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy
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- Process for preparing diphenylalkene derivatives
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A process for preparing a diphenylalkene derivative of the formula [II] STR1 which comprises oxidizing a diphenylalkanoic acid derivative of the formula [I] STR2 wherein R1 and R2 are each substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aralkyl or substituted or unsubstituted aryl, R1 and R2 may form a heteroring together theirwith or with an adjacent benzene ring, R3, R4, R5, R6, R7, R8, R9, R10 and R11 are each hydrogen atom, halogen atom, substituted or unsubstituted alkyl, substituted or unsubstituted hydroxyl or substituted or unsubstituted amino, R12 and R13 are each hydrogen atom or substituted or unsubstituted alkyl, X is carboxyl, amide, ester or halide thereof.
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