A tandem Aldol-Grob reaction of ketones with aromatic aldehydes
作者:George W. Kabalka、David Tejedor、Nan-Sheng Li、Rama R. Malladi、Sarah Trotman
DOI:10.1016/s0040-4020(98)00976-4
日期:1998.12
Aromatic aldehydes react with ketones to produce(E)-1-aryl-1-alkenes via a tandem Aldol-Grob cleavage reaction sequence. The reaction, initiated by boron trifluoride, also produces a carboxylic acid fragment.
[EN] ZWITTERIONIC PHOSPHONIUM SALTS<br/>[FR] SELS DE PHOSPHONIUM ZWITTERIONIQUES
申请人:UNIV MCGILL
公开号:WO2010012096A1
公开(公告)日:2010-02-04
A zwitterionic phosphonium salt of Formula I: wherein n is 0 or 1; R is H or SO3-; R' is selected from the group consisting of C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, phenyl, substituted phenyl, benzyl and C1-C10 alkoxycarbonyl; R' is CX3 when n is O; and X is selected from the group consisting of F, Cl, Br and I. The zwitterionic phosphonium salts are useful reagents for the preparation of alkenes and acetals from the corresponding aldehyde.
Stereoselective Rhodium-Catalyzed Isomerization of Stereoisomeric Mixtures of Arylalkenes
作者:Tao Li、Wanxiang Zhao、Hongxuan Yang、Wenke Dong、Wencan Wang
DOI:10.1055/s-0040-1707166
日期:2020.10
Abstract A new efficient method for the synthesis of a high ratio of E-alkenes from E/Z mixtures of alkenes with B2pin2 in the presence of a rhodium catalyst is described. This reaction features mild reaction conditions, broad functional group tolerance, and highly great application potential.
facile light‐mediated preparation of small palladium nanoparticles (PdNPs) with a diameter of 1.3 nm and low dispersity by using low‐priced and readily prepared photoactive polymers is presented. These polymers act as reagents for the photochemical reduction of Pd ions and they are also stabilizers for the PdNPs generated in situ. The PdNP–polymer hybrid materials prepared by this reliable approach are
Olefination of<i>N</i>-Sulfinylimines under Mild Conditions
作者:Shubhendu Dhara、Charles E. Diesendruck
DOI:10.1002/ejoc.201601577
日期:2017.2.24
A very simple and efficient diastereoselective synthesis of 1,2-disubstituted alkenes has been achieved under mildconditions. The sulfoxide stabilised N-sulfinylimine reacted with in situ generated phosphonate carbanion to give 1, 2-disubtituted alkenes in good to excellent yields. Different aryl phosphonate reacted with a range of electronically diverse N-sulfinylimine to afford in almost greater