The first clean, high-yield route is presented to methylidenes RuCl 2(L)(PCy 3)(=CH 2) (L = H 2IMes or IMes), key vectors for catalysis and deactivation in many olefin metathesis reactions. (H 2IMes = N,N′-bis(mesityl)imidazolin-2-ylidene; IMes = N,N′-bis(mesityl)imidazol-2-ylidene).

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Journal Catalysis Science and Technology
Lummiss, J.A.M. (Justin A. M.), Beach, N.J. (Nicholas J.), Smith, J. C, & Fogg, D.E. (Deryn E.). (2012). Targeting an Achilles heel in olefin metathesis: A strategy for high-yield synthesis of second-generation Grubbs methylidene catalysts. Catalysis Science and Technology, 2(8), 1630–1632. doi:10.1039/c2cy20213a