Patent ID: 6313322
Filing Date: 2001-11-06
Classification: C07C

Abstract:
A process for preparing acetals of the formula I ##STR3##wherea) the Rs are, independently of one another, a C.sub.1 -C.sub.20 -alkenyl radical, orb) the two Rs together form --(CH.sub.2).sub.m --, where m is a number from 2 to 4, and --(CH.sub.2).sub.m -- is optionally substituted by a C.sub.1 -C.sub.8 -alkyl group, comprising:reacting 3-methyl-2-butenal in the presence of a catalyst selected from the group consisting of sulfamic acid, a N-(C.sub.1 -C.sub.8 -alkyl)sulfamic acid and a N,N-di(C.sub.1 C.sub.8 -alkyl)sulfamic acid withan alcohol of the formula IIaR--OH (IIa),oran orthoester of the formula (III)HC--(OR).sub.3 (III),ora mixture thereof, orwith an alcohol of the formula IIbHO--(CH.sub.2).sub.m --OH (IIb).