B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 31/22 (2006.01) B01J 31/18 (2006.01) C07C 29/14 (2006.01) C07C 29/143 (2006.01) C07C 29/147 (2006.01)
Patent
CA 2291486
The object of the present invention is a process for the preparation of alcohols by reduction of the carbonyl function in substrates belonging to the class of aldehydes, ketones, esters or lactones, which substrates may contain unsaturated functions other than carbonyl, comprising: a) the reaction of the carbonyl substrate with stoichiometric amounts of a silane in the presence of catalytic amounts of an active zinc compound which is monomeric and not a hydride, b) the hydrolysis of the thus-obtained siloxane with a basic agent, and c) the separation and purification, if necessary, of the thus-obtained alcohol. The catalytically active compound is generally obtained by the reaction of an oligomeric or polymeric precursor compound of zinc with a complexing agent.
L'invention concerne un procédé permettant de préparer des alcools par réduction de la fonction carbonyle dans des substrats appartenant à la classe des aldéhydes, des cétones, des esters et des lactones, ces substrats pouvant comprendre des fonctions autres que carbonyles. Ce procédé consiste a) à faire réagir le substrat carbonyle avec des quantités stoichiométriques d'un silane en présence de quantités catalytiques d'un composé de zinc actif monomère et non hybride; b) à hydrolyser le siloxane ainsi obtenu avec un agent basique; et c) à séparer et purifier, si nécessaire, l'alcool ainsi obtenu. Le composé catalytiquement actif est généralement obtenu par réaction d'un composé de précurseur polymère ou oligomère de zinc avec un agent de complexage.
Fetherstonhaugh & Co.
Firmenich S.a.
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