Lmidazol-2-ylidenes

The Hedrick and Waymouth groups have also studied methods for generating NHC catalysts in situ for ROP without an external base [147-150], Thermal generation occurs readily with chloroform adduct 295 and pentafluorophenyl adduct 296 [147, 149]. Both compounds perform well as polymerization catalysts although 296 is stable at room temperature unlike 295. (lmidazol-2-ylidene)... 

Furstner, A., Thiel, O. R., Kindler, N., Bartkowska, B. Total Syntheses of (S)-(-)-Zearalenone and Lasiodiplodin Reveal Superior Metathesis Activity of Ruthenium Carbene Complexes with lmidazol-2-ylidene Ligands. J. Org. Chem. 2000, 65, 7990-7995. 

The Peris group has looked at the influence of lmidazol-2-ylidene, imidazol-4 ylidene, and pyrazol-3-ylidene ligands on the P-alkylation of secondary alcohols... 

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