CAS 983-81-3 appears in our catalog under these names: trans-1,2-Bis(diphenylphosphino)ethylene, >96.0%(T), (E)-1,2-Bis(diphenylphosphino)ethene 98%, TRANS-1,2-BIS(DIPHENYLPHOSPHINO)ETHYLEN&, (E)-1,2-BIS(DIPHENYLPHOSPHINO)ETHENE, 97%. Offered by: TCI, Ambeed, Sigma-Aldrich, Fluorochem. Available pack sizes: 1g, 100mg, 250mg, 5g, 25g.