Patent ID: 7368616

Claim:
A method of forming a compound of formula (IV): said method comprising the steps of: a) reacting a compound of formula (I) with a compound of formula S 1 -M to give a compound of formula (II); b) reacting the compound of formula (II) with a compound of formula S 2 -M to give a compound of formula (III); and c) eliminating H 2 X from the compound of formula (III) to give a compound of formula (IV), wherein Ar 1 and Ar 2 are independently selected from optionally substituted aryl or heteroaryl groups; X is O, S, NH or NR; L is a bond or a linking group which contains 1, 2 or 3 atoms; R and R 1 are independently selected from the group consisting of optionally substituted alkyl, aryl, alkylaryl, arylalkyl and heteroaryl groups; R 2 is selected from the group consisting of alkoxy, aryloxy, arylalkyloxy, alkylaryloxy, alkylthio, arylthio, alkylarylthio and arylalkylthio; H is bound to a carbon atom C′ of Ar 2 ; C′ and the carbon atom of C═X are separated by 3-5 atoms; S 1 and S 2 are each selected from optionally substituted alkyl, aryl or heteroaryl groups, M comprises a metal; and M is linked to S 1 and S 2 by a carbon-metal bond.