申请人:Bayer Aktiengesellschaft
公开号:US05146001A1
公开(公告)日:1992-09-08
In the preparation of benzyl ketones of the formula ##STR1## a benzyl chloride of the formula ##STR2## is reacted with an acid chloride of the formula R.sup.6 --CO--Cl (III) a) in a first stage with an excess of zinc powder in the presence of a diluent at a temperature between 80.degree. C. and 200.degree. C. under an inert gas atmosphere, and separating off the excess zinc powder, thereby to obtain a benzyl derivative of the formula ##STR3## and b) in a second stage reacting the benzyl derivative of the formual (IV) with an acid chloride of the formula (III) in the presence of a palladium catalyst and in the presence of a diluent at a temperature between 0.degree. C. and 150.degree. C. under an inert gas atmosphere.
在制备化学式为##STR1##的苄基酮时,将化学式为##STR2##的苄基氯与化学式为R.sup.6 --CO--Cl (III)的酸氯在惰性气氛下,在80°C至200°C的温度范围内,通过在第一阶段使用过量锌粉和稀释剂的情况下反应,并分离出多余的锌粉,从而获得化学式为##STR3##的苄基衍生物;然后在第二阶段,在惰性气氛下,在0°C至150°C的温度范围内,通过在存在钯催化剂和稀释剂的情况下,将化学式为(IV)的苄基衍生物与化学式为(III)的酸氯反应。