Reactions of phosphorus acids with N-tert-butyl-2,2-dichloropropanimine

Reaction of N-tert-butyl-2,2-dichloropropanimine with dialkylphosphorous acids led to the formation of stable adducts, the chlorine atoms of which are inactive towards subsequent transformations. The primary salt of O,O-dialkyldithiophosphoric acid and N-tert-butyl-2,2-dichloropropanimine, N-tert-butyl-2,2- dichloropropaniminium O,O-dialkylthiophosphate, reacted with the second molecule of acid to form bis- (dialkoxythiophosphoryl) disulfide and N-tert-butyl-2-chloropropaniminium chloride as the product of reduction of the C-Cl bond of the starting imine salt. The latter reacted with another acid molecule to afford N-tert-butyl-2-(dialkoxythiophosphorylthio)propaniminium chloride via reduction-substitution of the primary iminium salt.