Figure 2.

Substrate scope for the cyclopropene–BCB and aryne–BCB ene reactions. Thermal ellipsoids are shown at 50%. H atoms have been omitted for clarity. All reactions of vinyldiazo compounds were carried out on a 0.1 mmol scale and of aryne precursors on 0.2 mmol scale. Yields are isolated yields. ^a3z was obtained in a 1:0.2 ratio with the regioisomeric ene product. ^bReaction of 1-naphthalyne. ^cReaction of 2-naphthalyne.