申请人:Badische Anilin- & Soda-Fabrik Aktiengesellschaft
公开号:US04009202A1
公开(公告)日:1977-02-22
2(OR 3)-Methyl-1-acetoxy-4-alkoxy(or phenoxy)-1,3-butadienes and a process for their manufacture. The new 2(or 3)-methyl-1-acetoxy-4-alkoxy(or phenoxy)-1,3-butadienes are obtained by heating the corresponding methyl-4-alkoxy(or phenoxy)-crotonaldehyde with an excess of acetic anhydride and an alkali metal acetate, alkali metal carbonate or alkali metal hydroxide or a non-aromatic bicyclic amine or by heating the corresponding methyl-1-acetoxy-4,4-dialkoxy-2-butene in the presence of p-toluenesulfonic acid and quinoline at a temperature of from 150.degree. to 260.degree. C. The new compounds are of very considerable importance as intermediates in the synthesis of carotenoids.
2(或3)-甲基-1-乙酰氧基-4-烷氧基(或苯氧基)-1,3-丁二烯和其制备方法。新的2(或3)-甲基-1-乙酰氧基-4-烷氧基(或苯氧基)-1,3-丁二烯是通过将相应的甲基-4-烷氧基(或苯氧基)-巴豆醛与过量的乙酸酐和碱金属醋酸盐、碱金属碳酸盐或碱金属氢氧化物或非芳香族双环胺加热得到的,或者在对甲苯磺酸和喹啉存在下,以150℃至260℃的温度加热相应的甲基-1-乙酰氧基-4,4-二烷氧基-2-丁烯。这些新化合物在类胡萝卜素的合成中作为中间体具有非常重要的意义。