Reactions of 5-substituted 1,3,4-thiadiazole-2-thiones with chloroacetylenephosphonates
摘要:
Reactions of 1-chloroacetylene-2-phosphonates with thiadiazole-2-thiones in anhydrous acetonitrile occur regio- and chemoselectively to form novel fused phosphorus-containing heterocycles, 2-substituted 5-(dialkoxyphosphoryl)thiazolo[2,3-b][1,3,4]thiadiazol-4-ylium chlorides. The formation of these fused cyclic compounds is associated only with the thione form of the starting thiadiazoles. Reactions of the salts of thiadiazole-2-thiols with 1-chloroacetylene-2-phosphonates result in the formation of compounds of linear structure. (C) 2015 Elsevier Ltd. All rights reserved.
Compounds which are useful as selective herbicides have the general structural formula ##STR1## in which R.sup.1 and R.sup.2 are selected from hydrogen, and lower alkyl, alkenyl, alkylene and alkoxy structures and together possess a total of 1 to 6 carbon atoms when R.sup.3 is ethyl, propyl, isopropyl, cyclopropyl, methoxy or tert-butyl.
Reactions of 5-substituted 1,3,4-thiadiazole-2-thiones with chloroacetylenephosphonates
作者:Dmitrij M. Egorov、Yulija L. Piterskaya、Albina V. Dogadina、Nataly I. Svintsitskaya
DOI:10.1016/j.tetlet.2015.02.027
日期:2015.3
Reactions of 1-chloroacetylene-2-phosphonates with thiadiazole-2-thiones in anhydrous acetonitrile occur regio- and chemoselectively to form novel fused phosphorus-containing heterocycles, 2-substituted 5-(dialkoxyphosphoryl)thiazolo[2,3-b][1,3,4]thiadiazol-4-ylium chlorides. The formation of these fused cyclic compounds is associated only with the thione form of the starting thiadiazoles. Reactions of the salts of thiadiazole-2-thiols with 1-chloroacetylene-2-phosphonates result in the formation of compounds of linear structure. (C) 2015 Elsevier Ltd. All rights reserved.
5-Acylamino-1,3,4-thiadiazole-2-sulfonamides and use as herbicides
申请人:Gulf Oil Corporation
公开号:US04097263A1
公开(公告)日:1978-06-27
Compounds which are useful as selective herbicides have the general structural formula ##STR1## in which R.sup.1 and R.sup.2 are selected from hydrogen, and lower alkyl, alkenyl, alkylene and alkoxy structures and together possess a total of 1 to 6 carbon atoms when R.sup.3 is ethyl, propyl, isopropyl, cyclopropyl, methoxy or tert-butyl.