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Molybdenum Disubstituted Alkylidene Complexes

  • Author(s): Taylor, JW
  • Schrock, RR
  • Tsay, C
  • et al.
Abstract

Through relatively straightforward techniques that begin with Mo(NAr)(CH-t-Bu)[OCMe(CF ) ] (Ar = 2,6-i-Pr C H ), we have prepared Mo(NAr)(CMePh)(OMesityl) , [Mo(NAr)(CMePh)(OC F ) ] , Mo(NAr)(CMePh)(OC F ) (MeCN), Mo(NAr)(CMePh)(OC F ) (bipyridyl), Mo(NAr)(CMePh)(Cl) (bipyridyl), Mo(NAr)(CMePh)(Cl)(OHMT)(MeCN) (OHMT = O-2,6-(2,4,6-Me C H ) C H ), and Mo(NAr)(CMePh)(Pyrrolide)(OHMT). X-ray studies reveal that in five compounds the alkylidene isomer (A) is that in which the phenyl group in the alkylidene points toward the imido nitrogen. In Mo(NAr)(CMePh)(OC F ) (MeCN) the isomer in which the methyl group points toward the imido nitrogen (isomer B) has cocrystallized with isomer A (12%). In two 14e compounds that contain isomer A, the Mo═C-C angles differ by 30-36°, consistent with a Mo C-H agostic interaction. Several of the complexes reported here react readily with ethylene, 1-decene, or cyclooctene to give the expected products, thus confirming their viability as initiators or intermediates in metathesis reactions. 3 2 2 2 6 3 2 6 5 2 2 6 5 2 6 5 2 2 3 6 2 2 6 3 6 5 2 β ...

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