Synthesis of corrosion preventive long-chain N-alkyl-2-(phenylthio)- acetohydrazides and 2-oxo-2-phenylethyl-2-alkanoylhydrazinecarbodithioates

摘要

Long-chain N-alkyl-2-(phenylthio)acetohy-drazides were synthesized via the reactions of 2-(phenylthio)acetohydrazide with long-straight-chain aldehydes and then reduction with sodium borohy-dride. The reactions of long-straight-chain hydra-zides with carbon disulfide in alkaline media give the corresponding carbodithioate salts. Heating of potassium 2-alkanoylhydrazinecarbodithioates with phena-cyl bromide do not yield cyclization and failed to give the corresponding long-chain thiazolidine-2-thiones, but gave the corresponding 2-oxo-2-phenylethyl-2-alkanoylhydrazinecarbodithioates via nucleophilic substitution reaction. In addition, the synthesized compounds were tested for their corrosion prevention capabilities in acidic or in mineral oil media.