Facile and Selective Synthesis of 4-Methyl- and 4-Phenylthiosemicarbazide (=N-Methyl- andN-Phenylhydrazinecarbothioamide) Derivatives of Benzil (=1,2-Diphenylethane-1,2-dione)
作者:David G. Calatayud、Francisco J. Escolar、Elena López-Torres、M. Antonia Mendiola
DOI:10.1002/hlca.200790228
日期:2007.11
A selective synthesis of 4-methylthiosemicarbazide (=N-methylhydrazinecarbothioamide; 4a) derivatives by reaction with benzil (=1,2-diphenylethane-1,2-dione; 3) is described. The reaction conditions determined the condensation product formed. The most important factor was the acid used: in the presence of conc. HCl solution, the open-chain 2 : 1 compound 1a was exclusively obtained, whereas in the