Thiophosphoryl chloride

Thiophosphoryl chloride can be generated by several reactions starting from phosphorus trichloride. The most common and practical synthesis, hence used in industrial manufacturing, is directly reacting phosphorus trichloride with excess sulfur at 180 °C. : Using this method, yields can be very high after purification by distillation. Catalysts facilitate the reaction at lower temperatures, but are not usually necessary. Alternatively, it is obtained by combining phosphorus pentasulfide and phosphorus pentachloride. : ==Structure==

Thiophosphoryl chloride has tetrahedral molecular geometry and C3v molecular symmetry, with the structure . According to gas electron diffraction, the phosphorus–sulfur bond length is 189 pm and the phosphorus–chlorine bond length is 201 pm, while the bond angle is 102°. ==Reactions==

is soluble in benzene, carbon tetrachloride, chloroform, and carbon disulfide. : : An intermediate in this process appears to be tetraphosphorus nonasulfide. is used to thiophosphorylate organic compounds (to add thiophosphoryl group, P=S, with three free valences at the P atom, to organic compounds). ==References==