Reactions of μ-dichlorobis(η3-allyl)palladium(II) with bis(1-H-benzo-triazolyl-methyl) selenide: Formation of unexpected polymeric structure with dormant Se donor site. Applications of the polymeric Pd-complexes in Heck coupling

Bis(1-H-benzo-triazolylmethyl)selenide (L) was synthesized by reacting Se2− generated in situ with 1-(chloromethyl)-1H-benzotriazole. It shows characteristic proton, C-13 and Se-77 NMR spectra. μ-Dichlorobis(η3-allyl)palladium(II) reacts with L resulting in a polymeric complexes which form single crystals of stoichiometry [Pd(η3-C3H5)(L)]·ClO4/PF6·CH3CN (1/2). Their structures are of chain type. The anions ClO4-/PF6- interlink these chains through hydrogen bonds. The 1 and 2 have been found suitable for catalyzing Heck's C-C coupling reactions (TON up to 93,000; conversion up to 93%).