Bis (1, 2-diphenyl-1, 2-ethylenedithiolato) nickel (0)(1a) reacts with quadricyclane (Q) to give a 1: 1 adduct which has the same structure as that of the adduct between 1a and norbornadiene (NBD). Q reacts with 1a much faster than NBD. The adduct is thermally stable but photosensitive to dissociate into 1a and NBD.