The reactions of Wittig reagents with episulfides gave symmetrical olefins and triphenylphosphine sulfide in moderate yields. The same olefins were obtained by reactions of Wittig reagents with elemental sulfur. These reactions might proceed through thiocarbonyl intermediates, the existence of which was confirmed by Diels–Alder reactions with dienes.
Matrix isolation and infrared spectrum of thioformyl cyanide
作者:C.Oliver Kappe、Ming Wah Wong、Curt Wentrup
DOI:10.1016/0040-4039(93)88121-x
日期:1993.10
The elusive molecule thiofomyl cyanide, SCHCN (2), was generated by flash vacuum pyrolysis of allyl cyanomethyl sulfide (1) and characterized by argon matrix infrared spectroscopy. The observed infrared absorptions (2221, 1320, 1103, 889, and 824 cm−1) are in good agreement with ab initio molecular orbital calculations at the MP2/6-31G* level.
通过快速真空热解烯丙基氰基甲基硫醚(1)生成难以捉摸的硫代甲酰氰分子SCHCN(2),并通过氩气基质红外光谱对其进行表征。观察到的红外吸收(2221、1320、1103、889和824 cm -1)与MP2 / 6-31G *级别的从头算分子轨道计算非常吻合。
Regiochemistry in thiocarbonyl Diels-Alder additions: reversal of selectivity by substituent effects in thioaldehydes
作者:E. Vedejs、D. A. Perry、K. N. Houk、Nelson G. Rondan