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Reactions of 5-Substituted 1,3,4-Thiadiazole-2-thiones with Chloroacetylenephosphonates. -The nucleophilic addition of thiadiazole-2-thiones to chloroacetylene-2-phosphonates proceeds regio-and chemoselectively to afford novel, fused, phosphorus-containing thiazolo[2,3-b][1,3,4]thiadiazol-4-ylium chlorides in high yields. -(EGOROV, D. M.; PITERSKAYA, Y. L.; DOGADINA, A. V.; SVINTSITSKAYA*, N. I.; Tetrahedron Lett. 56 (2015) 12, 1552-1554, http://dx.