It is provided a process for industrially advantageously producing a branched aldehyde represented by the formula; ##STR1## \x9bwherein Y represents an acyl group of two or more carbon atoms; and X represents an acyloxymethyl group represented by --CH.sub.2 OY' (where Y' represents an acyl group of two or more carbon atoms), cyano group or an alkoxycarbonyl group! which is useful as an intermediate for pharmaceuticals and agricultural chemicals, comprising subjecting an olefinic compound represented by the following formula; ##STR2## (wherein Y and X are the same as defined above), to the reaction with hydrogen and carbon monoxide in the presence of a rhodium compound and a tertiary organic phosphorus compound with an electronic parameter (.upsilon.-value) of 2080 to 2090 cm.sup.-1 or with a steric parameter (.theta.-value) of 150 to 180.degree..
本发明提供了一种工业上有利的生产分支醛的方法,所述分支醛的
化学式为:##STR1## 其中,Y代表两个或更多碳原子的酰基;X代表一个表示为--CH.sub.2 OY'(其中Y'代表两个或更多碳原子的酰基)、
氰基或烷氧羰基的酰氧甲基基团!该方法适用于制药和农业
化学品的中间体制备,包括将以下
化学式所表示的烯烃化合物:##STR2## (其中Y和X的定义与上述相同),在存在
铑化合物和具有电子参数(.upsilon.-值)为2080至2090 cm.sup.-1或具有立体参数(.theta.-值)为150至180度的三级有机
磷化合物的情况下,与
氢气和
一氧化碳反应。