EXPERIMENTAL 0,O-Dialkyl hydrogen phosphorodithioates. These acids were prepared by a method outlined by Mastin, Norman, and Weilmuenster.2 These crude acids are 80-907, purity as determined by titration with standard alkali, and were used as such or purified by the method of Bacon and L e S ~ er . ~ Basic zinc double salt of 0,O-di-n-propyl hydrogen phospho- rodithioate. 0,O-Di-n-propyl hydrogen phosphorodithioate, 214 g. (1.0 mole), was slowly ...