The functional group A can be an alkene or alkyne group having from about 2 to about 8 carbon atoms, or from about 2 to about 4 carbons, optionally substituted with an alkyl having for example from about 1 to about 12 carbons, or from about 1 to about 12 carbons, or an aryl or heterocyclic group having for example from about 6 to about 24 carbons, or from about 6 to about 18 carbons.