| http://www.w3.org/ns/prov#value | - The diimine compounds which are advantageously employed in the present invention can be represented by the formula: wherein A is alkylene or cycloalkylene having from 2 to 15 carbon atoms, x is an integer from 0 to 2, and R is independently selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms.
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