Platinum-Mediated Reversible Cross-linking/Decross-linking of Polyacetylenes Substituted with Phosphine Ligands: Catalytic Activity for Hydrosilylation

Polymeric metal complexes have attracted interest as polymer catalysts. In the present study, borane-2-(diphenylphosphino)-N-(4-ethynylphenyl)benzamide (1o) and borane-4-(diphenylphosphino)-N-(4-ethynylphenyl)benzamide (1p) were synthesized and polymerized using (nbd)Rh(PPh3)[C(Ph) = CPh2] as a catalyst. The BH3 groups were removed from the formed polymers to obtain polyacetylenes with −PPh2 ligands at the side chains, from which polymeric metal complexes were constructed by intermolecular and intramolecular coordination of platinum (Pt). The Pt-coordinating cross-linked network polymers were decross-linked by the addition of PPh3. The Pt-coordinating polymers catalyzed hydrosilylation of 1-dodecene with diethoxymethylsilane.