THE FIRST FLUORO-TRITHIATETRAPHOSPHA-HEPTANES

Abstract

Fluorinated alpha- and beta-tetraphosphorus-trisulfur molecules were prepared by the reaction of alpha- or beta-P(4)S(3)X(2) (X = Cl, Br, I) with (n-butyl)(3)SnF. The substitution reaction of the alpha-isomers yields under retention of the configuration at the phosphorus atoms alpha-P(4)S(3)XF and alpha-P4S3F2. In the reaction of the p-isomers more products were observed, because the configuration of the phosphorus atom can be retained or inversed in the first step of the substitution which yields beta-P(4)S(3)X(exo)F(exo) or beta-P(4)S(3)X(exo)F(endo). The mass relation of the products depends on the halogen ligand. In the second substitution beta-P4S3(F-exo)(2) or beta-P4S3FexoFendo are formed. beta-P4S3(F-endo)(2) was not observed. By the reaction of beta-P(4)S(3)l(2) With BiX(3) (X = Cl, Br, I) we also were able to prepare small amounts of and beta-P(4)S(3)X(endo)X(exo)-molecules (X = I, Cl, Br) with an inversed configuration at one phosphorus atom. The P-31- and F-19-NMR parameter of all compounds are discussed.