公开(公告)号：US3541161A

公开(公告)日：1970-11-17

申请号：US72111968

申请日：1968-04-12

Applicant: MONTEDISON SPA

Inventor： PREGAGLIA GIANFRANCO ,  GUGLIELMO GREGORIO

IPC: C07C29/10 ,  C07C31/02

CPC classification number: C07C29/103 ,  C07C31/125

Abstract: Monohydric alcohols, containing one carbon atom less than the parent metadioxane, are made by hydrogenolysis of 4,4-dialkyl metadioxanes, having a methyl or an ethyl group as one alkyl substituent and a C1 to C5 alkyl group as the other, with molecular hydrogen, in which a catalyst of Raney nickel, preferably 0.1 to 20% by weight, and zinc chloride, preferably 0.1 to 5% by weight of the metadioxane is used. A C1 to C4 alkanol is employed advantageously as solvent and preferred reaction conditions include 20 to 200 atmos. hydrogen pressure and 120 DEG to 220 DEG C. The starting material is made by condensation under mineral acid conditions of an olefine with aqueous formaldehyde. In the examples, 4 - methyl - 4 - propyl metadioxane, prepared from 2-methyl-1-pentene and aqueous formaldehyde, yields on hydrogenolysis, in methanol, 3-methyl hexanol.