alpha-Imino-thioaldehydes were generated by retro-Diels-Alder reaction under flash vacuum thermolysis conditions. They were found to be unstable and cyclized to 2,3-dihydro-1,3-thiazoles. This cyclization was investigated by ab initio calculations.
Arnaud, Roger; Pelloux-Leon, Nadia; Ripoll, Jean-Louis, Journal of the Chemical Society. Perkin transactions II, 1995, # 6, p. 1077 - 1086