On the Behavior of α,β-Unsaturated Thioaldehydes and Thioketones in the Diels−Alder Reaction
作者:Guang Ming Li、Shuqiang Niu、Masahito Segi、Koichiro Tanaka、Tadashi Nakajima、Ralph A. Zingaro、Joseph H. Reibenspies、Michael B. Hall
DOI:10.1021/jo000740q
日期:2000.10.1
The calculations show that in the dimerization reaction of thioacrolein (I), the head-to-tail (S-C-S bonded) dimers are kinetically more stable by about 5 kcal/mol but slightly thermodynamically unstable by about 2 kcal/mol than the head-to-head (S-S bonded) dimers. The calculations on thiocinnamaldehyde (IV) indicate that the dimerization reactions of phenyl-substituted alpha,beta-unsaturated thioaldehydes