Chiral diboranes as catalysts for the stereoselective organopolymerization of epoxides.

ABSTRACT: It is demonstrated that stereoselective polymerization of epoxides, long a domain of metal-based compounds, can also be achieved via the application of organocatalysts. A simple two-step synthesis starting from widely available 1,1'-bi-2-naphthol (BINOL) backbones yields diboranes which, in tandem with organobases, deliver isotactic-enriched (it) polyethers from the homopolymerization of racemic propylene oxide (PO) and other epoxides. Thereby, isotactic diad contents of up to 88% can be achieved, resulting in well-defined (1.1 < Đ _M < 1.3) polyethers with high molar masses (M _n > 100 000 g mol^-1). Notably, it is also possible to grow it-enriched sequences of PPO on aliphatic polyester-type initiators, thus enabling the in

SUBMITTER: Sirin-Sariaslan A 

PROVIDER: S-EPMC9491197 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature