An operationally simple and environmentally benign protocol for a highly regio‐ and chemoselective preparation of β‐substituted alcohols by means of ring‐opening reactions of oxiranes with various aliphatic alcohols, H2O, NaN3, and NaCN as nucleophiles in the presence of catalytic amounts of zirconium tetrakis(dodecyl sulfate) as Lewis acid/surfactant‐combined catalysts (LASCs) was developed. The high
Herein, we describe the generation of an organochromium-type carbanion species from a non-activated C-H bond and its nucleophilic addition to aldehydes. The catalytic carbanion generation occurred through formal deprotonation of a non-activated C-H bond under mild conditions and did not need the prefunctionalization or anion stabilizing group. Carbon radical intermediates generated by decatungstate
Facile hydrogen/metal exchange between butylpotassium and saturated ethers
作者:Ruth Lehmann、Manfred Schlosser
DOI:10.1016/s0040-4039(01)80015-0
日期:1984.1
At temperatures between −100 and −40°C, lithium salt-free butylpotassium (prepared from dibutylmercury) readily metalates saturated ethers such as dimethyl ether or tetrahydrofuran.
EFFICIENT CATALYSIS OF HETEROPOLY ACID FOR ALCOHOLYSIS OF EPOXIDE
作者:Yusuke Izumi、Kyoji Hayashi
DOI:10.1246/cl.1980.787
日期:1980.7.5
Heteropoly acid (HPA) was found to catalyze the alcoholysis of epoxide more efficiently than the conventional acid catalysts such as sulfuric acid, perchloric acid and p-toluenesulfonic acid, at 45°C in the homogeneous liquid phase. The reason for the high catalytic activity of HPA is also discussed.