The radical of an alkene in which the double bond indicated by en(e) is between carbons 1 and 2 (carbon 1 being the radical or yl carbon), i.e., RCH=CH; sometimes expressed as alk-1-en-1-yl.
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The radical of an alkene in which the double bond indicated by en(e) is between carbons 1 and 2 (carbon 1 being the radical or yl carbon), i.e., RCH=CH; sometimes expressed as alk-1-en-1-yl.