| http://www.w3.org/ns/prov#value | - by the general formula, R14 R15 C = CR16 R17, wherein R14 and R16 are hydrogen or C1 - 3 alkyl groups, hydrogen being preferred and R15 and R17 represent hydrogen, alkyl groups, cycloalkyl groups, aralkyl groups, aryl groups, or other hydrocarbon groups such as alkenyl groups or halohydrocarbon groups which do not interfere with reactivity.
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