Rather than proceeding through a Michael-type or 1,4-addition, thioacetic acid adds across unsaturated aldehydes in an autocatalytic manner and involving a double exotherm, as demonstrated by both adiabatic and reaction calorimetry. NMR studies show that an intermediate acylthio-hemiacetal is involved and that the product continues to react competitively with thioacetic acid.
绝热法和反应量热法都证明,
硫代乙酸不是通过迈克尔型或1,4-加成反应,而是以自催化方式跨不饱和醛加成并涉及双放热反应。NMR研究表明,其中涉及中间体酰基
硫代-
半缩醛,并且该产物继续与
硫代乙酸竞争性地反应。