... Considerations of activity, functional group tolerance, and availability led us to focus on the use of Mo(CHCMe,Ph)(NAr)(OCMe(CF,),), A: = 2,6-(i-Pr&H3, l)9.'0 as the metathesis catalyst ... 0 1992 American Chemical Society ... Strem Chemicals, Inc., 7 Mulliken Way, Newburyport, MA ...