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Synthesis of Tungsten Imido Alkylidene Complexes that Contain an Electron-Withdrawing Imido Ligand

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journal contribution
posted on 17.12.2015 by Jonathan C. Axtell, Richard R. Schrock, Peter Müller, Stacey J. Smith, Amir H. Hoveyda
Tungsten NArR alkylidene complexes have been prepared that contain the electron-withdrawing ArR groups 2,4,6-X3C6H2 (ArX3, X = Cl, Br), 2,6-Cl2-4-CF3C6H2 (ArCl2CF3), and 3,5-(CF3)2C6H3 (Ar(CF3)2). Reported complexes include W­(NArR)2Cl2(dme) (dme = 1,2-dimethoxyethane), W­(NArR)2(CH2CMe3)2, W­(NArR)­(CHCMe3)­(OTf)2(dme), and W­(NArR)­(CHCMe3)­(ODBMP)2 (DBMP = 4-Me-2,6-(CHPh2)­C6H2). The W­(NArR)­(CHCMe3)­(ODBMP)2 complexes were explored as initiators for the polymerization of 2,3-dicarbomethoxynorbornadiene (DCMNBD).