M. Al-talib et al., Reaction of 1,3-and 1,4-bis (1,3,4-oxadiazole-5(3H)-thione-2-yl) benzenes with aryl aldehydes, HETEROCYC C, 5(5), 1999, pp. 429-432
1,3- and 1,4-bis (1,3,4-oxadiazole-5(4H)-thione-7-yl) benzenes 2m,p, readil
y react with aryl aldehydes to give 1,3- and 1,4- benzene dicarboxylic acid
bis (arylmethylene)dihydrazides 4m(a-e) and 4p(a-e). A mechanism was propo
sed.