prov:value
| - ng 2-6 carbon atoms, including straight and branched chain C alkenyl, especially lower alkenyl such'as vinyl, a-allyl (i.e. prop-2-enyl), ,B-allyl (i.e. 1- methyl vinyl), 'y-allyl (i.e. prop-l-enyl), but-'l-enyl, but- 2-enyl (i.e. crotyl), but-3-enyl, methallyl (i.e. Z-methylprop-Z-enyl), isobutenyl (i.e. 2-methy1-prop-1-enyl), pentenyl, hexenyl, and the like, and particularly C alkenyl; or phenyl
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