Thirteen new aroyl ureas were synthesized by the reaction of 2-amino-5-(1o-chlorophenoxyethyl)-1,3,4-thiodiazole with aroyl isocyanates,and their structures were confirmend by IR,~(1)H NMR and elemental(analysis).

Thirteen N-(1,3,4-thiodiazol-2-y1)-N′-aroyl ureas were synthesize d by the reaction of aroyl iso-cyanates with 2-amino-1,3,4-thiodiazole i n yields of 54.

Synthesis,Crystal Structure and Biological Activity of N-(5-Trifluoromethyl-1,3,4-thiadiazol-2-yl)-N'-aroylureas;

Synthesis and Biological Activity of N-[5-(Pyrid-4-yl)-1,3,4-thiadiazol-2-yl]-N'-aroylureas;

Selenium-containing heterocylic compounds 2-arylamino-2-selenazolin-4-ones were synthesized in 71%～92% yields by the reaction of arylselenoureas with ethyl 2-bromoacetate in ethanol.

Soil sorption coefficient prediction of substituted phenylureas by artificial neural networks;