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-丁二烯及其制备方法。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乙酸盐、碱金属碳酸盐或碱金属氢氧化物或非芳香二环胺加热,或者在存在对甲苯磺酸和喹啉的情况下将相应的甲基-1-乙酰氧基-4,4-二烷氧基-2-丁烯加热至150度至260度C,可以获得新的2(或3)-甲基-1-乙酰氧基-4-烷氧基(或苯氧基)-1,3-丁二烯。这些新化合物在类胡萝卜素合成中作为中间体具有非常重要的意义。