| http://www.w3.org/ns/prov#value | - In embodiments, when R1 is omitted and R2 and/or R3 are a moiety other than hydrogen, and the composition is to be cationically polymerizable, materials such as strong acids, alkyl iodides (iodomethane), iodine, acetyl perchlorate, and Lewis acids (boron trifluoride, tin tetrachloride, aluminum trichloride, and organometallic derivatives, e.g., RAlCl2, R2AlCl, wherein R is an alkyl group and R2 is
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