(2,2'-Bipyridine)palladiumdichloride Derivatives as Recyclable Catalysts in Heck Reactions

摘要

Fluorous ponytailed [PdCl_2(4,4'-bis(R_fCH_2OCH_2)-2,2'-bpy)], (R_f = CF_3(CF_2)_2 2a, HCF_2(CF_2)_3 2b, HCF_2(CF_2)_7 2c, and non-fluorous [PdCl_2(4,4'-bis(CH_3)-2,2'-bpy)] 3 were prepared and successfully employed in the catalyst reusage studies running the homogeneous Heck reaction of C_6H_5I and H_2C=CHCO_2CH_3, the catalysts being recycled for 8 consecutive runs without loss of activity and the recovery procedure being the direct vacuum distillation of mixtures to take advantage of the very high thermal stability of these PdCl_2(2,2'-bpy) derivatives.