Adjective
olefinic (comparative more olefinic, superlative most olefinic)
Characteristic of, or containing olefins.
Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
Using adamantylidenylfulvene, a similar adduct, was obtained where the adamantyl group is positioned rigidly onto the molecular framework by virtue of the olefinic linkage originating from the fulvene.