Diphosphine analogues of proton sponge: X-ray crystal structure of [Pd(η3-allyl)(dppn)]BF4 ? CH2Cl2 (dppn = 1,8-bis(diphenylphosphino)naphthalene)

Article abstract of DOI:10.1016/S0022-328X(96)06451-0

The X-ray crystal structure of [Pd(η³-allyl)(dppn)]BF₄ ? CH₂Cl₂ (1) where dppn = 1,8-bis(diphenylphosphino)naphthalene is reported. Comparison of the conformation of the ligand in 1 with that in the free state shows that there is a relief of strain on complexation analogous to the relief of strain observed upon protonation of proton sponge.