| http://www.w3.org/ns/prov#value | - When R is a perfluoroalkyl group or a perfluoroalkylether group, at least one X is preferably other than a bond, most preferably no X is a bond or a perfluoroalkyl group, because perfluorovinyl groups linked directly to perfluoroalkyl groups require temperature in excess of about 300??? C. to dimerize and are subject to isomerization.
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