The first Pd-catalyzed Mizoroki-Heck-type reaction of [Ph2SRfn][OTf] with alkenes is described. The reaction of [Ph2SRfn][OTf] (Rfn = CF3, CH2CF3) with alkenes in the presence of 10 mol% Pd[P(t-Bu)3]2 and TsOH...
Synthesis of Stilbenes by Rhodium-Catalyzed Aerobic Alkenylation of Arenes via C–H Activation
作者:Xiaofan Jia、Lucas I. Frye、Weihao Zhu、Shunyan Gu、T. Brent Gunnoe
DOI:10.1021/jacs.0c03935
日期:2020.6.10
Arenealkenylation is commonly achieved by late transition metal-mediated C(sp2)-C(sp2) cross-coupling, but this strategy typically requires prefunctionalized substrates (e.g., with halides or pseudohalides) and/or the presence of a directing group on the arene. Transition metal-mediated areneC-Hactivation and alkenylation offers an alternative method to functionalize arene substrates. Herein, we
3,6,8-tetrabromopyrene with 4-[(–)-β-citronellyloxy]phenylethyne was employed to synthesize 1,3,6,8-tetra[4-(citronellyloxy)phenylethynyl]pyrene. The pyrene derivative catalyzed the reductive desulfonylation of ethenyl sulfones via visible-light irradiation (514 nm green light-emitting diodes) in the presence of i-Pr2NEt. The β-citronellyloxy groups provided the sufficient solubility to the highly
Synthesis of Air‐stable, Odorless Thiophenol Surrogates via Ni‐Catalyzed C−S Cross‐Coupling
作者:Valentin Magné、Liam T. Ball
DOI:10.1002/chem.201901874
日期:——
efficient catalytic method for the preparation of S‐aryl isothiouronium salts, and demonstrate that these air‐stable, odorless solids serve as user‐friendly sources of thiophenols in synthesis. Diverse isothiouronium salts featuring synthetically useful functionality are readily accessible by nickel‐catalyzed C−S cross‐coupling of (hetero)aryliodides and thiourea. Convenient, chromatography‐free isolation
Studies on ylides exclusive formation of olefins from carbonyl compounds on treatment with para-bromo- and para-iodo-benzylidenetriphenylarsenanes
作者:Nirmal Kumari、Purshottam S. Kendurkar、Ram S. Tewari
DOI:10.1016/s0022-328x(00)83551-2
日期:1975.8
Two new semistabilized arsonium ylides, para-bromo- and para-iodo-benzylidenetriphenylarsenane, have been formed, and treated with a range of carbonylcompounds to yield exclusively trans-olefins. In no case was an epoxide obtained.