gem-Dialkylation or alkylative reduction of α-unbranched aliphatic aldehydes is easily carried out by replacing the carbonyl oxygen with the gem-dihalide functionality followed by substitution of each halogen (bromine or iodine) by two n-alkyl groups or one sec- or tert-alkyl group and one hydrogen atom using higher-order dialkyllithium cyanocuprates.
gem-二烷基化或α-非支链脂肪醛的烷基还原可以通过用gem-二卤化物功能取代羰基氧,然后用两个n-烷基取代每个卤素(
溴或
碘),或者用一个二烷基组和一个氢原子进行取代,采用高阶二烷基
锂氰铜盐来实现。