Reactions of Thioamides and Selenoamides with Hydrazonoyl Chlorides Under Phase-Transfer Conditions. A Convenient Method of Preparation of δ<sup>2</sup>-1,3,4-Thiadiazolines and δ<sup>2</sup>-1,3,4-Selenadiazolines
作者:M. L. Petrov、M. A. Abramov
DOI:10.1080/10426509808545473
日期:1998.2.1
Reactions of enolizable thio- and selenoamides with hydrazonoyl chlorides in the presence of bases and phase-transfer catalysts result in 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines. The reactions proceed through formation of corresponding enethiolates and eneselenolates. At 80°C 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines eliminate dialkylamines, giving 2-ylidene-Δ2-1,3,4-thia- and selenadiazolines