| http://www.w3.org/ns/prov#value | - is hydrogen, an alkyl group having from 1 to 30 carbon atoms, or a halogen, and R2 is an alkyl group having from 1 to 6 carbon atoms, (2) an alpha-olefin having the structure: ##STR26## wherein R' and R are alkyl groups having from 1 to 7 carbon atoms, (3) a vinyl ether selected from the group consisting of methyl vinyl ether, ethyl vinyl ether, the propyl vinyl ethers, and the butyl vinyl ether
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