申请人:DAVY McKEE (LONDON) LIMITED
公开号:EP0018162A1
公开(公告)日:1980-10-29
Butyrolactone is produced by oxidizing an aldehyde-ether of the general formula:
wherein R, and R2 each, independently of the other, represent a C, to C4 alkyl radical, and R3 and R4 each, independently of the other, represent a hydrogen atom or a C, to C3 alkyl radical, or wherein R, represents a C, to C4 alkyl radical, R2 and R3 together with the carbon atoms to which they are attached form a 5-membered or 6-membered cycloaliphatic ring, and R4 represents a hydrogen atom or a C, to C3 alkyl radical, to form an acid ether of the general formula:
followed by deetherification, dehydration and cyclization. Oxidation can be carried out with e.g. gaseous oxygen. Deetherification can be accomplished by contact with an acid catalyst, whilst cyclization may occur spontaneously. A cyclic process is described in which allyl alcohol is converted by reaction with a suitable olefin, e.g. iso-butylene, to an allyl ether of a tertiary alcohol, e.g. allyl t-butyl ether, which is then hydroformylated to form the compound of formula (I), whilst the olefin, e.g. iso-butylene, released on deetherification of the acid ether of formula (II), is recycled to the allyl ether formation step.
丁内酯是通过氧化通式如下的醛醚而制得的:
其中 R 和 R2 各自独立地代表一个 C 至 C4 烷基,R3 和 R4 各自独立地代表一个氢原子或一个 C 至 C3 烷基,或其中 R 代表一个 C 至 C4 烷基,R2 和 R3 与它们所连接的碳原子一起形成一个 5 元或 6 元环脂族环,R4 代表一个氢原子或一个 C 至 C3 烷基,形成通式的酸醚:
然后进行脱醚、脱水和环化反应。氧化作用可以用气态氧气等进行。脱醚可以通过与酸催化剂接触来完成,而环化则可能自发发生。描述了一种循环工艺,其中烯丙基醇通过与合适的烯烃(如异丁烯)反应转化为叔醇的烯丙基醚(如烯丙基叔丁基醚),然后进行氢甲酰化反应生成式(I)化合物,而式(II)酸醚脱醚反应释放的烯烃(如异丁烯)被回收至烯丙基醚形成步骤。