Abstract: Disclosed herein is a stabilized composition comprising: (A) a polymeric resin, and (B) a stabilizing amount of a phosphite of the structure wherein R1, R2, R3, and R4 are independently selected from the group consisting of alkyl moieties and substituted cycloalkyl moieties of the structure wherein R14, R15, R16, R17, and R18 are independently selected from the group consisting of hydrogen and hydrocarbyl, provided that at least one of R14, R15, R16, R17, and R18 is not hydrogen and that no more than one of R1, R2, and R3 is alkyl, R9 and R10 are independently selected from the group consisting of hydrogen and hydrocarbyl, and Ar is an aromatic moiety.

Abstract: A process for producing organo-phosphites of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each 2,4-di-tert-butyl and R.sup.3 is hydrogen is provided. The process involves heating a mixture of a pentaerythritol bis-phosphorohalidite and a phenolic compound and applying a vacuum of at least about 10 inches of mercury wherein the temperature of the reaction mixture is maintained between about 30.degree. C. and about 140.degree. C. Conversions to the organic spiro bis-phosphite is at least twice that of the same process without a vacuum.

Abstract: A process for producing organo-phosphites of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each 2,4-di-tert-butyl and R.sup.3 is hydrogen is provided. The process involves heating a reaction mixture containing pentaerythritol wherein the pentaerythritol has an average particle size of about 250 microns or less, preferably the pentaerythritol has an average particle size of about 150 microns or less, phosphorous trihalide, a phenolic compound of the formula: ##STR2## wherein each R.sup.1 and R.sup.2 is t-butyl and R.sup.3 is hydrogen, a solvent selected from the group consisting of heptane, hexane, octane, xylene, toluene, and mixtures of the solvents containing at least one of the aforementioned and a catalyst. The process utilizing the aforementioned pentaerythritol particle size has the unexpected advantages of short reaction times as compared to the same process using a larger pentaerythritol particle size.