申请人:BASF Aktiengesellschaft
公开号:US06313322B1
公开(公告)日:2001-11-06
A process for preparing acetals of the formula I
where
a) the Rs are, independently of one another, a C1-C20-alkyl or C3-C20-alkenyl radical, or
b) the two R radicals together form the members of an unsubstituted or C1-C10-alkyl-substituted 5- to 7-membered cyclic acetal,
by reacting 3-methyl-2-butenal in the presence of sulfamic acid, of a N-(C1-C8-alkyl)sulfamic acid or of a N,N-di(C1-C8-alkyl)sulfamic acid as catalyst with:
an alcohol of the formula R—OH (IIa), or
an orthoester of the formula HC—(OR)3 (III) or
a mixture of an alcohol of the formula (IIa) and an orthoester of the formula (III), or
an alcohol of the formula HO—(CH2)m—OH (IIb), where m is a number from 2 to 4, and (CH2)m group in the alcohol IIb may be substituted by a C1-C10-alkyl group.
一种制备式I的缩醛的方法,其中a)Rs分别是C1-C20-烷基或C3-C20-烯基基团,或b)两个R基团一起形成未取代或C1-C10-烷基取代的5至7元环缩醛的成员,通过在3-甲基-2-丁烯醛存在下,与磺酸、N-(C1-C8-烷基)磺酸或N,N-二(C1-C8-烷基)磺酸作为催化剂反应,与下列物质之一:式R—OH(IIa)的醇,式HC—(OR)3(III)的正酯,或式(IIa)的醇和式(III)的正酯的混合物,或式HO—(CH2)m—OH(IIb)的醇,其中m是2至4之间的数字,醇IIb中的(CH2)m基团可以被C1-C10-烷基基团取代。