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.