an environmentally benign synthesis of aryl-hydrazones with aqueous extract of acacia pods as a natural surfactant type catalyst

an environmentally benign and clean synthesis of aryl-hydrazones by reacting variety of carbonyl compounds with thiosemicarbazide, semicarbazide, aminoguanidine, and phenyl hydrazine has been achieved using aqueous extract of acacia concinna pods as a natural surfactant type catalyst. we found that the aqueous extract of acacia concinna pods could be effectively used for the synthesis of aryl-hydrazones. this efficient process proceeds smoothly in aqueous medium at room temperature within a very short period of time. all the products were obtained by simple filtration. the low cost, easy availability of the catalyst and simple reaction conditions are the notable features of the present method.