Abstract
Reaction of the bridged bisbenzimidazolium salts 2,6-bis(N1-alkyl-N3-methylenebenzimidazolium)pyridine dibromide (1, alkyl = methyl; 2, alkyl = ethyl; 3, alkyl = n-propyl; 4, alkyl = n-butyl) with palladium acetate yields the palladium pincer complexes of type [Pd(L)Br]Br, 5−8 (L = 2,6-bis(N1-alkyl-N3-methylenebenzimidazolin-2-ylidene)pyridine). Compounds 1, 2·0.5MeOH, 4·CH2Cl2, and 6·MeOH (L = 2,6-bis(N1-ethyl-N3-methylenebenzimidazolin-2-ylidene)pyridine) were characterized by X-ray diffraction. The molecular structure of 6 shows a distorted square-planar coordination geometry for the palladium atom. In situ generated pincer complexes 5−8 have been tested as catalysts in Heck-type coupling reactions of different aryl halides with styrene.
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