Procédé de préparation de nouveaux phosphites organiques

1,216,598. Phosphite esters. MELLEBEZONS. 9 Oct., 1968 [11 Oct., 1967], No. 47959/68. Heading C2C. [Also in Divisions C3 and C5] The invention comprises phosphite esters of the general formula in which R1, R2, R3, R4 and R5 are C 4 -C 18 alkyl groups, or are phenyl, alkylaryl, aralkyl or cycloalkyl groups, the groups being the same or different and being unsubstituted or substituted, and n is an integer from 1 to 40. They may be obtained by transesterifying triphenyl phosphite with 2,2-di-cyclohexanol propane and, if desired, subjecting the resulting product to a transesterification reaction with an appropriate alcohol or phenol, which may be an alkanol, cycloalkanol, dicycloalkanol, arylalkanol, glycol, phenol or diphenol, e.g. nbutanol, 2-ethyl-1-hexanol, a decanol, cyclohexanol, an octyl-, nonyl-, or cumyl-phenol or bis-phenol-A. The transesterification reaction is preferably carried out in the presence of an ionizable transesterification catalyst, e.g. an alkali metal hydroxide, carbonate, alcoholate or phenolate. The corresponding alkaline earth compounds may also be used and other catalysts mentioned are strong inorganic acids, multivalent metal salts, and dialkyl and diaryl phosphites. The products are useful as stabilizers and antioxidants.