Molybdenum- or tungsten-based metathesis catalysts, often compared to ruthenium systems.
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RutheniuM, dichloro[1,3-dihydro-1,3-bis(2,4,6-triMethylphenyl)-2H-iMidazol-2-ylidene](phenylMethylene)(tricyclohexylphosphine)-, (SP-5-41)-
W(C5(CH3)5)(NO)(CH2C6H5)(CH2Si(CH3)3)