| abstract |
Novel compounds of the structuren nwherein R 1 and R 2 are each an alkoxy group which may benthe same or different and have from one to ten carbonnatoms, and R 3 -R 6 are each individually, hydrogen, anhydrocarbyl group, a hydrocarboxyl group, a nitrongroup, a silyl group or a halogen, with the provisosnthat (1) if either R 1 and R 2 are methoxy, then at leastnone of R 3 -R 6 is not hydrogen, (2) if R 1 and R 2 are bothnethoxy, then at least one of R 3 -R 6 is not hydrogen, andn(3) R 1 and R 2 cannot both be methoxy.nThese electron donor compounds are used in the manufacture of olefinnpolymerization catalysts. |