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An improved one-pot synthesis of olefin metathesis catalysts (PCy 3 )(L)Ru CHPhCl 2 (L = N-heterocyclic nucleophilic carbene: IMes, 3; SIMes, 4 ) employs potassium tert -amylate to deprotonate the imidazolium salt ligand precursor. Both of the reaction steps are carried out using a one-pot protocol in hexane with commercially available reagents under mild conditions, permitting the isolation of 3 and 4 by simple filtration.
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Jafarpour et al. (2001) studied this question.
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