Patent ID: 6069267
Filing Date: 2000-05-30
Classification: C07F

Abstract:
A process for the preparation of organodiphosphites of the general formula (R.sup.1 O).sub.2 P(OZO)P(OR.sup.1).sub.2 wherein R.sup.1 and Z are different substituted or unsubstituted aryl groups, which comprises:(a) treating at a temperature between about -25.degree. C. and 10.degree. C. one molar equivalent of PCl.sub.3 with about two molar equivalents of R.sup.1 OH in the absence of an organic base;(b) treating the solution of step (a) at between about -25.degree. C. and 10.degree. C. with at least two equivalents of an organic base to produce (R.sup.1 O).sub.2 PCl and a substantially insoluble salt formed from the organic base and HCl which is formed by the reaction of R.sup.1 OH and PCl.sub.3 ; and(c) reacting at a temperature of between about -25.degree. C. and 10.degree. C. the (R.sup.1 O).sub.2 PCl with about one half molar equivalent of HO--Z--OH, provided if less than three equivalents of the organic base are utilized in step (b), then a sufficient quantity of additional organic base is added to bring the total equivalents of organic base utilized in the process to at least three.