Highly Chemoselective Catalytic Hydrogenation of Unsaturated Ketones and Aldehydes to Unsaturated Alcohols Using Phosphine-Stabilized Copper(I) Hydride Complexes
作者:Jian-Xin Chen、John F. Daeuble、Donna M. Brestensky、Jeffrey M. Stryker
DOI:10.1016/s0040-4020(99)01098-4
日期:2000.4
phenyldimethylphosphine-stabilized copper(I) hydride complex provides for the highly chemoselective hydrogenation of unsaturated ketones and aldehydes to unsaturated alcohols, including the regioselective 1,2-reduction of α,β-unsaturated ketones and aldehydes to allylic alcohols. The active catalyst can be derived in situ by phosphine exchange using commercial [(Ph3P)CuH]6 or from the reaction of copper(I) chloride
Ir–ReOx/SiO2 acted as a highly active and selective heterogeneous catalyst for the hydrogenation of unsaturated aldehydes to unsaturated alcohols in water at low H2 pressure (0.8 MPa) and low temperature (303 K). The catalysis is derived from the synergy between Ir metal and ReOx.
Alicyclic compounds, their use and process for preparing same
申请人:Firmenich S.A.
公开号:US03993604A1
公开(公告)日:1976-11-23
Use of alicyclic compounds, some of which are new, as odor-modifying ingredients for manufacturing perfumes, perfumed products or synthetic essential oils, and as flavor-modifying ingredients for the manufacture of artificial flavors or for the aromatization of foodstuffs, animal feeds, pharmaceutical preparations or tobacco products. Process for preparing said alicyclic compounds.
Disclosed is a practical method for efficiently producing an alcohol compound by hydrogenating an aldehyde by using a homogeneous copper catalyst which is an easily-available low-cost metal species. Specifically disclosed is a method for producing an alcohol compound, which is characterized in that a hydrogenation reaction of an aldehyde compound is performed in the presence of a homogeneous copper catalyst and a diphosphine compound.
Iron‐catalyzed reductions: Selective iron‐catalyzed reduction of aldehydes with hydrogen generated in situ by the water–gas shift reaction is presented (see scheme). The generality and selectivity of this mild procedure are demonstrated by the efficient reduction of various aromatic, aliphatic and α,β‐unsaturated aldehydes.