| http://www.w3.org/ns/prov#value | - The butenylene radical is --CH???CHCH2 CH2 -- or --CH2 CH???CHCH2 -- and appears in the form of silacyclopentenyl siloxane units, i.e., ##STR1## where Z can be, for example, an alkyl radical such as a methyl radical, see U.S. Pat. No. 3,509,191 (Atwell, issued Apr. 28, 1970).
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