Suitable examples of Group 13 compounds are represented by the formula Ry MXz, wherein M is a Group 13 metal, preferably aluminum or boron, each R is independently an alkyl group having from 1 to about 20, preferably from about 1 to about 10, more preferably from about 2 to about 8 carbon atoms, X is a halogen atom, preferably chloro, y and z can each independently have a value from 1 to a value e