Patent ID: 6255532
Filing Date: 2001-07-03
Classification: B01J,C07F

Abstract:
A process for the preparation of phosphabenzene compounds of the formulae I and II ##STR9##where R.sup.1 to R.sup.6, independently of one another, are hydrogen, COOM, SO.sub.3 M, NR.sub.3 X, NR.sub.2, OR, COOR, SR, C.sub.1 -C.sub.12 -alkyl, C.sub.6 -C.sub.12 -aryl, C.sub.7 -C.sub.12 -aralkyl, or C.sub.3-6 -heterogcycoalkyl having 1 to 3 heteroatoms, and wherein C.sub.1 -C.sub.12 -alkyl, C.sub.6 -C.sub.12 -aryl, C.sub.7 -C.sub.12 -aralkyl, or C.sub.3-6 -heterocycloalkyl are optionally substituted by COOM, SO3M, NR.sub.3 X, NR.sub.2, OR, COOR or SRM is hydrogen, NH.sub.4 or an alkali metal,X is an anion, R is hydrogen, C.sub.1-6 -alkyl, or C.sub.1-12 -alkyl, C.sub.6-12 -aryl,C.sub.7-12 -aralkyl or C.sub.3-6 -heterocycloalkyl having 1 to 3 heteroatoms optionally substituted by the above radicals R.sup.1 to R.sup.6 or linked to form fused rings, and--W-- is a bridge selected from a covalent bond, an oxo group, a sulfur group, an amino group, a di-C.sub.1-6 -alkylsilicon group or a C.sub.1-16 -radical optionally part of one or more linked cyclic or aromatic rings and optionally interrupted by 1 to3 heteroatoms, where the phosphabenzene ring o- or m-position not bonded to the bridge may carry one of the radicals R.sup.1 to R.sup.6,with the exception of bis-3,3'-(2,4,6-triphenyl-3-phosphabenzene)-1,1 -biphenyl,by reacting corresponding pyrylium salts with PH.sub.3 in the presence of a catalytic amount of acid and in the presence or absence of a solvent or diluent wherein the pyrilium salts are mixed with PH.sub.3 at above 0.degree. C. and reacted at from 0.degree. C. to 200.degree. C. and at a pressure greater than 1 bar wherein PH.sub.3 is passed into the reaction mixture during the reaction in order to keep the PH.sub.3 partial pressure essentially constant.