Patent ID: 6992201

Claim:
Process for preparing compounds of the formula (I) where D is an unsubstituted or substituted 1,1′-biphenyl-2,2′-diyl- or 1,1′-binaphthyl-2,2′-diyl radical and R 1 is a radical selected from the group of C 1 –C 12 -alkyl, C 2 –C 12 -alkenyl, C 1 –C 12 -halogenalkyl, C 5 –C 15 -arylalkyl and C 4 –C 14 -aryl, with the proviso that R 1 has a molar mass of 215 or less, comprising in a step a) reacting compounds of the formula (II), PHal 3 (II) where Hal is in each case independently chlorine, bromine or iodine, with compounds of the formula (III), R 1 —OH (III) where R 1 is as defined above to give compounds of the formula (IV) R 1 OPHal 2 (IV) where R 1 and Hal are each as defined above, in a step b) ditillatively purifying the compounds of the formula (IV) of a) and in a step c), reacting the compounds of the formula (IV), purified in step b) with compounds of the formula (V) D(OH) 2 (V) where D is as defined above to give compounds of the formula (I).