申请人:Teijin Limited
公开号:US03978092A1
公开(公告)日:1976-08-31
An unsaturated carbonyl compound, for example, one expressed by the following formula ##EQU1## is prepared by maintaining at an elevated temperature an allyl acetal of an .alpha.,.beta.-unsaturated aldehyde, for example, one expressed by the following formula ##EQU2## or a novel dienyl ether derived from it, for example, one expressed by the following formula ##EQU3## The allyl acetal can be derived, for example, from .beta.-methylcrotonaldehyde having 5 carbon atoms and prenyl alcohol having 5 carbon atoms. It is possible therefore to introduce an allyl residue containing at least 3 carbon atoms into the carbon atoms at the .gamma.-position to the carbonyl group of an .alpha., .beta.-unsaturated aldehyde containing at least 5 carbon atoms by a reaction consisting of the reduced number of steps. Moreover, the unsaturated aldehyde having the increased number of carbon atoms can be formed at a high yield by a relatively simple reaction.
以下是翻译结果:
一种不饱和羰基化合物,例如以下公式所示的化合物:##EQU1##,通过保持升高的温度,使α,β-不饱和醛的烯丙基缩醛,例如以下公式所示的化合物:##EQU2##或从其衍生的新型二烯基醚,例如以下公式所示的化合物:##EQU3##。例如,可以从具有5个碳原子的β-甲基丙烯醛和具有5个碳原子的异戊烯醇中得到烯丙基缩醛。因此,可以通过简化步骤的反应将至少含有5个碳原子的α,β-不饱和醛的碳原子的γ-位置引入至少含有3个碳原子的烯丙基残基。此外,通过相对简单的反应,可以高产率地形成具有增加碳原子数的不饱和醛。