New organoiron synthons. cis- and trans-Vinylene dication equivalents
作者:Marianne Marsi、Myron Rosenblum
DOI:10.1021/ja00335a078
日期:1984.11
Les complexes (dialcoxy-1,2 ethylene)Fp [Fp=η 5 -C 5 H 5 Fe(CO) 2 ] peuvent servir d'equivalents des dications cis ou trans-vinylene
Les complexes (diacoxy-1,2 ethylene)Fp [Fp=η 5 -C 5 H 5 Fe(CO) 2 ] peuvent servir d'equivalents des dications cis ou trans-vinylene
A Pd-Catalyzed Site-Controlled Isomerization of Terminal Olefins
作者:Wenlong Ren、Fei Sun、Jianxiao Chu、Yian Shi
DOI:10.1021/acs.orglett.0c00168
日期:2020.3.6
An effective Pd-catalyzed isomerization of olefins with 2-PyPPh2 as the ligand is described. A wide variety of trans-2-olefins bearing various functional groups can be obtained with high regio- and stereoselectivity under mild reaction conditions. The ligand is crucial for the reaction.
An Alternative Mechanism for the Cobalt-Catalyzed Isomerization of Terminal Alkenes to (<i>Z</i>)-2-Alkenes
作者:Anastasia Schmidt、Alexander R. Nödling、Gerhard Hilt
DOI:10.1002/anie.201409902
日期:2015.1.12
The cobalt‐catalyzed selective isomerization of terminal alkenes to the thermodynamically less‐stable (Z)‐2‐alkenes at ambient temperatures takes place by a new mechanism involving the transfer of a hydrogen atom from a Ph2PH ligand to the starting material and the formation of a phosphenium complex, which recycles the Ph2PH complex through a 1,2‐H shift.
Supported Imidazolylphosphine Catalysts for Highly (<i>E</i>)-Selective Alkene Isomerization
作者:Gulin Erdogan、Douglas B. Grotjahn
DOI:10.1021/ol500327k
日期:2014.6.6
For fine chemical synthesis, immobilized catalysts offer little advantage if they produce a product mixture that must be separated. Selective isomerization of terminal olefins is achieved by heterogenized bifunctional catalysts. Outstanding and consistent (E)-selectivity (>99%) even in cases where (E) and (Z) isomers are of comparable stability, combined with modest catalyst loadings (1 to 2 mol %), set these catalysts apart from previously reported systems. Ease of catalyst removal and high geometric selectivity avoid tedious purifications.
MARSI, M.;ROSENBLUM, M., J. AMER. CHEM. SOC., 1984, 106, N 23, 7264-7266