Patent ID: 6077968
Filing Date: 2000-06-20
Classification: C07F

Abstract:
A process for the preparation of alkyl arylphosphinites of the formula (I): ##STR5## in which R.sup.1 is (C.sub.1 -C.sub.16)-alkyl, cyclohexyl, cyclopentyl, aryl which can also be substituted by halogen, (C.sub.1 -C.sub.6)-alkoxy groups,R.sup.2 is aryl which can also be substituted by halogen, (C.sub.1 -C.sub.6)-alkyl, (C.sub.1 -C.sub.6)-alkoxy groups, where R.sup.1 and R.sup.2 together with the phosphorous atom can also form a ring, andR.sup.3 is (C.sub.1 -C.sub.4)-alkyl, which comprises reacting a halo(aryl)phosphine of the formula (II): ##STR6## in which R.sup.1, R.sup.2 have the meaning given above and X is halogen, by adding a neutralizing agent consisting essentially of ammonia to a solution of the phosphine and an alcohol of the formula (III):R.sup.3 OH (III)in which R.sup.3 has the meaning given above, wherein the alcohol is present in excess based on the phosphine and wherein essentially all of the phosphine is present in the solution prior to the addition of the neutralizing agent.