provides a means to carry out the reaction under versatile experimental conditions. The rate of thiol addition was dependent on the electronic and steric factors of the enones and the thiols. The substituent at the β-carbon of the α,β-unsaturated ketone substrate caused steric hindrance during conjugate addition and required longer reaction times. The rate of reaction for alkane thiols e.g. ethanethiol was
已发现六
水合
高氯酸锌 (II) 是一种新型高效催化剂,可在室温下无溶剂条件下将
硫醇与 α,β-不饱和酮共轭加成。芳基、芳烷基和烷基
硫醇与环状和非环状 α,β-不饱和酮的反应在 5 分钟到 6 小时后发生,产率极好。Zn(ClO 4 ) 2 .6H 2 O 与不同溶剂的相容性提供了一种在多种实验条件下进行反应的方法。
硫醇加成速率取决于烯酮和
硫醇的电子和空间因素。α,β-不饱和酮底物的β-碳上的取代基在共轭加成过程中引起空间位阻,需要更长的反应时间。
烷烃硫醇的反应速率,例如