申请人:Hoffman-La Roche Inc.
公开号:US05453547A1
公开(公告)日:1995-09-26
A novel process for the manufacture of .gamma.-acetoxytiglic aldehyde ("C.sub.5 -aldehyde"), which is known as an important starting material for the production of vitamin A acetate from a (.beta.-ionylidenethyl)triphenylphosphonium halide and C.sub.5 -aldehyde, comprises treating a pentenyn-3-ol of the formula HC.tbd.C--C(CH.sub.3)(OH)--CH.dbd.C(R).sub.2 (II), wherein both R's signify either hydrogen or methyl, with ozone, preferably in a lower alkanol R.sup.1 OH, wherein R.sup.1 signifies C.sub.1-4 -alkyl, to obtain an aldehyde 2-hydroxy-2-methyl-3-butynal of the formula HC.tbd.C--C(CH.sub.3)(OH)--CHO (III). The aldehyde III may be converted to the C.sub.5 -aldehyde by conventional means.
一种用于制造γ-乙酰氧基戊二醛(“C.sub.5-醛”)的新工艺,该戊二醛被认为是从(β-离子基乙烯基)三苯基膦鎓卤化物和C.sub.5-醛制备维生素A醋酸酯的重要起始原料,包括将具有化学式HC.tbd.C--C(CH.sub.3)(OH)--CH.dbd.C(R).sub.2(II)的戊烯-3-醇,其中两个R分别表示氢或甲基,与臭氧反应,优选在较低的烷基醇R.sup.1 OH中,其中R.sup.1表示C.sub.1-4-烷基,以获得具有化学式HC.tbd.C--C(CH.sub.3)(OH)--CHO(III)的醛2-羟基-2-甲基-3-丁炔醛。醛III可以通过传统方法转化为C.sub.5-醛。