Synonyms: Palladium,[1,4-butanediylbis[diphenylphosphine]-P,P']dichloro-, (SP-4-2)-;Palladium,dichloro[tetramethylenebis[diphenylphosphine]]- (8CI);Palladium,[1,4-butanediylbis[diphenylphosphine-kP]]dichloro-, (SP-4-2)- (9CI);Phosphine,1,4-butanediylbis[diphenyl-, palladium complex;(1,4-Bis(diphenylphosphino)butane)palladium dichloride;1,4-Butylenebis(diphenylphosphine)palladium dichloride;Dichloro[1,4-bis(diphenylphosphino)butane]palladium;Dichloro[1,4-bis(diphenylphosphino)butane]palladium (II);[1,4-Bis(diphenylphosphino)butane]dichloropalladium;[1,4-Bis(diphenylphosphino)butane]palladium(II)dichloride;