RU93053340A - METHOD OF OBTAINING MONOARIFOSPHITES - Google Patents

Claims (1)

A method is proposed for preparing monoaryl phosphites of the formula ArOP (O) (OH) H, where Ar is an aryl radical. The method is based on the joint interaction of phosphorus trichloride, the corresponding phenol, phosphorous acid and water at the molar ratios of (1 + n): (3 + n): 2: 2n, where n <1. The process is carried out at a temperature of from 20 to 100 ^o С non-flammable low-boiling solvents such as polychloromethane, or in the absence of a solvent. Hydrogen chloride formed in the reaction is removed with an inert gas or at the boiling point of the solvent. It is obtained in quantitative yield and used for practical purposes without further purification. Received: monophenylphosphite, n $\genfrac{}{}{0ex}{}{\text{20}}{\text{D}}$ 1.5260; mono- (4-methylphenyl) phosphite, n $\genfrac{}{}{0ex}{}{\text{20}}{\text{D}}$ 1.5120. Monoaryl phosphites are used as intermediates for the synthesis of phosphorus compounds with beneficial properties, including pesticidal activity. Monoaryl phosphites and their salts with inorganic and organic bases are patented as fungicides.