prov:value
| - ng the formula: ##STR4## wherein R1 or R2 is an alkyl, cycloalkyl heterocyclic or aryl group, R3, R4 and R5 are a hydrogen or alkyl, cycloalkyl, or aryl groups, m equals 1 to 20 and n equals about 1 to about 500 and where the metal is one of the transition metals especially including zinc, copper, iron, nickel, cobalt.
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