Bis(triphenylphosphine)palladium Cycloheptadienynylium Tetrafluoroborate:  A Palladium Complex of Tropyne

Palladium complexes of cyclohepta-3,5-dien-1-yne (4) and cyclohepta-1,5-dien-3-yne (5) have been prepared and converted to a palladium complex of tropyne (6) by treatment with triphenylcarbenium tetrafluoroborate.