| http://www.w3.org/ns/prov#value | - The organo-metallic compound catalyst component (b) may, for example, be compounds of the formula RM wherein R is an alkyl or aryl group, and M is lithium, sodium or potassium; compounds of the formula R2 M' wherein R is the same as defined above and M' is zinc or cadmium; compounds of the formula R2-l MgXl wherein R is the same as defined above, X is a halogen atom and l is zero or 1; compounds o
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