Patent ID: 7112696

Claim:
Process for preparing compounds of the formula (I) in which R 1 and R 2 are each independently a monovalent radical which in each case has 1 to 30 carbon atoms or PR 1 R 2 as a whole is a 5- to 9-membered heterocyclic radical which contains a total of 2 to 50 carbon atoms and optionally contains up to three further heteroatoms which are selected from the group of oxygen and nitrogen, and A 1 and A 2 are each independently a substituted or unsubstituted ortho-arylene radical and E is E 1 or E 2 where E 1 is an unsubstituted, monosubstituted or disubstituted vicinal cis-alkenediyl radical and E 2 is a vicinal alkanediyl radical in which the two yl carbon atoms each bear one or two hydrogen atoms, comprising in a step a), reacting compounds of the formula (II) in which A 1 , A 2 and E are each as defined above with compounds of the formula (III) R 1 R 2 P-Hal (III) in which R 1 and R 2 are each as defined above and Hal 1 is chlorine, bromine or iodine, in the presence of acid or base, to form compounds of the formula (IV) in which A 1 , A 2 , E, R 1 and R 2 are each as defined above and in a step b), reducing the compounds of the formula (IV) to compounds of the formula (I).