REDUCTIONS OF PHOSPHONODITHIOFORMATES - SYNTHESES OF ALPHA-PHOSPHONYLTHIOLS AND HEMIDITHIOACETALS

The phosphonodithioformates appeared versatile precursors to the (merc aptomethyl)phosphonates and derivatives, through sodium borohydride re duction in acetonitrile heated under reflux. By contrast, when the red uction was performed at room temperature with sodium borohydride, the (mercapto-alkylthio-methyl)phosphonates were exclusively obtained; red uction with BH3-Me(2)S (BMS) or within lithium diisopropylaminoborohyd ride also led to these hemidithioacetals. The aforementioned products of reduction were characterized by the syntheses of various derivative s. In particular, S-phosphonyl trithiocarbonates, N-phenyl imidodithio carbonate and dithiocarbamate were prepared.