The action of triethylsilane on α-ethylenic aldehydes has been studied in the presence of two types of nickel catalysts as well as palladium on charcoal. Two phenomena can result: either 1,2 or 1,4 additions only, the trans-1,4 adduct being predominant, or a competition between these two additions and coupling reactions. A comparative regioselective and stereoselective study was carried out making
在两种类型的
镍催化剂以及木
炭上的
钯存在下,已经研究了三乙基
硅烷对α-
乙烯醛的作用。可以产生两种现象:仅1,2或1,4加成,反式-1,4加合物占优势,或者这两个加成与偶联反应之间存在竞争。除了先前的催化作用之外,还利用Speier
铂催化剂进行了区域选择性和立体选择性的比较研究。给出了结果的解释。