Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Bicyclo[2.2.2]octylidene is formed in four quite different ways. Reactions of the precursors do not complicate the chemistry of the carbene. The products are tricyclo[2.2.2.0 2,6 ]octane and bicyclo[2.2.2]octene, formed in approximately a 70:30 ratio. ... Bicyclo[2.2.2]octylidene is ...