Method for preparing organic phosphine compound by reducing phosphine-sulfur compound with high selectivity

The invention discloses a method for preparing an organic phosphine compound by reducing a phosphine-sulfur compound with high selectivity, and belongs to the technical field of organic synthesis. The method comprises the following steps: reacting a phosphine-sulfur compound R1R2R3PS with a metal reducing agent in an inert gas or nitrogen atmosphere in the absence of a solvent or in a non-polar hydrocarbon solvent at the temperature of 0-250 DEG C, and after the reaction is finished, separating and purifying to obtain the organic phosphine R1R2R3P, wherein R1, R2 and R3 are independently selected from aromatic or fat substituents, and at least one of R1, R2 and R3 is an aromatic substituent. The invention provides the method for converting the phosphine-sulfur compound R3PS into the organic phosphine R3P compound with high selectivity, the method is wide in application range, simple in process, low in cost, safe, controllable, environment-friendly and easy for industrial large-scale production, the organic ph