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-benzotriazolylmethyl)selenide (L) has been synthesized by reacting Se2− generated in situ with 1-(chloromethyl)-1H-benzotriazole. Proton, C-13 and Se-77 NMR spectra of L are characteristic. μ-Dichlorobis(η3-allyl)palladium(II) reacts with L resulting in polymeric complexes which give single crystals of stoichiometry [Pd(η3-C3H5)(L)]·ClO4/PF6·CH3CN (1/2). The single crystal X-ray diffraction analyses of these polymeric species reveal that they have chain type of structures, and anions through non-covalent interactions interlink these chains. On changing anion image with image the nature of chain is not affected. The 1/2 have been found suitable for catalyzing Heck’s C–C coupling reactions (TON up to 93,000; conversion up to 93%).