Synonyms: 9,9-DIMETHYL-4,5-BIS(DI-T-BUTYLPHOSPHINO)XANTHENE, MIN. 97% T-BU-XANTPHOS;97% t-Bu-XANTPHOS;9,9-DiMethyl-4,5-bis(di-t-butylphosphino)xanthene,97% t-Bu-XANTPHOS;4,5-Bis[di(tert-butyl)phosphino]-9,9-dimethyl-9H-xanthene;9,9-DiMethyl-4,5-bis(di-t-butylphosphino)xanthene, 99% t-Bu-XANTPHOS