Patent ID: 7456127

Claim:
A process for the homopolymerization or copolymerization of an alkylene oxide in the presence of an organoaluminum reaction product of A.) a ligand of the formula I, wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 12 and R 13 are the same or different and represent an alkyl group or hydrogen, with the proviso that at least one of the groups R 4 and R 13 represents hydrogen, R 8 represents the hydroxyl radical, E represents sulfur S, and n is 1, and B.) an aluminum compound of formula AlR 9 R 10 R 11 , wherein R 9 and R 10 are the same or different and represent a C 1-20 alkyl, aryl, arylalkyl, or alkylaryl group, or hydrogen, and R 11 is a C 1-20 alkyl, aryl, arylalkyl, or alkylaryl group, hydrogen, or halogen; wherein the process comprises the step of contacting a reaction mixture comprising at least one alkylene oxide with the organoaluminum reaction product of the ligand of the formula I and the aluminum compound as a polymerization catalyst.