A highly active chiral (S,S)-bis(oxazoline) Pd(ii) alkyl complex/activator catalytic system for vinyl polymerization of norbornene in air and water†
Abstract
A series of air/water-tolerant chiral Pd alkyl complexes (R2-(S,S)-BOZ)PdR′ (1–3, R = CH(CH3)2, Ph; R′ = Me, Ph) were synthesized and structurally characterized. In the presence of an excess of activator, such as [Ph3C][B(C6F5)4], [PhMe2NH][B(C6F5)4], or B(C6F5)3, the air/water-tolerant chiral Pd(II) alkyl complexes 1–3 could promote the norbornene polymerization in air and water using unpretreated technical grade solvent and monomer with extremely high activity up to 1.7 × 109 g PNB per molPd per h.