Synonyms: Phosphine,(1Z)-1,2-ethenediylbis[diphenyl- (9CI); Phosphine, 1,2-ethenediylbis[diphenyl-,(Z)-; Phosphine, vinylenebis[diphenyl-, (Z)- (8CI);(Z)-1,2-Bis(diphenylphosphino)ethene; (Z)-1,2-Bis(diphenylphosphino)ethylene;cis-1,2-Bis(diphenylphosphine)ethene; cis-1,2-Bis(diphenylphosphine)ethylene;cis-1,2-Bis(diphenylphosphino)ethene; cis-1,2-Bis(diphenylphosphino)ethylene;cis-Bis(diphenylphosphino)ethylene; cis-Vinylenebis[diphenylphosphine]