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■ Synthesis of 1,3-Dithietane-2,4-diylidenebis(cyanomethylphosphonates) and -phenyl-phosphinates and Their Reaction with Carboxylic Acid Hydrazides

Richard Neidlein,* Monica Jochheim, Claus Krieger, and Walter Kramer

*Pharmazeutisch-Chemishces Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 364, D-69120 Heidelberg, Germany

Abstract

1,3-Dithietane-2,4-diylidenebis(cyanomethylphosphonates) and -phenylphosphinates react with carboxylic acid hydrazides to yield tautomeric derivatives of 1,3,4-oxadiazoles. One of the starting materials as well as one of the reaction products is examined by X-ray crystal structure analysis.