Yttrium‐Mediated Ring‐Opening Copolymerization of Oppositely Configurated 4‐Alkoxymethylene‐β‐Propiolactones: Effective Access to Highly Alternated Isotactic Functional PHAs

The ring‐opening copolymerization (ROCOP) of functional 4‐alkoxymethylene‐β‐propiolactones (BPL OR s) by yttrium‐bisphenolate complexes was investigated. The ROCOP of equimolar mixtures of BPL OR s of opposite configurations, namely (R)‐BPL OR1/(S)‐BPL OR2 [R 1, R 2=OMe, OAllyl, OCH 2 Ph (=OBn), …