A one-component phosphonium borane Lewis pair serves as a dual initiator and catalyst in the ring-opening alternating copolymerization of anhydrides and epoxides

Abstract

Lewis pairs as synergistic catalysts have demonstrated versatile adaptabilities towards different monomers. Herein, we converted bi-component Lewis pair into one-component Lewis pair by integrating Lewis acid and ionic Lewis base...

Synthesis of degradable polyacetals via an intramolecular phosphonium bisborane Lewis pair catalyzed copolymerization of epoxides with o‐phthaladehyde

“…However, the catalytic efficiency was relatively low and the molecular weight of the reported copolymer needed further improvements. In contrast to binary organoborane based Lewis pair, we and others showed that one‐component organoborane based Lewis pair exhibited enhanced activity in the ROP 35,36,39–43 …”

“…Our group focused on the ring-opening polymerization (ROP) and ROAP using Lewis pair organocatalysts. 34,35 Previously, we reported phosphonium bisborane PPB-Br showed synergistic effect on the ROP of PO and exhibited good tolerance of various functional groups to prepared diverse functionalized PPOs. 36,37 We reasoned that the introduction of acetal units into the polyether backbone could effectively empower the degradability of the material and improve the scope and use of the material.…”

“…In contrast to binary organoborane based Lewis pair, we and others showed that one-component organoborane based Lewis pair exhibited enhanced activity in the ROP. 35,36,[39][40][41][42][43] To diversify the reaction scope of ROAP and demonstrate the synergistic effects on enhancing the activity of one-component organoborane based Lewis pair, we herein attempted to apply PBB-Br for the copolymerization of PO and OPA to generate degradable PPO with acetal backbone.…”

“…Our group focused on the ring‐opening polymerization (ROP) and ROAP using Lewis pair organocatalysts 34,35 . Previously, we reported phosphonium bisborane PPB‐Br showed synergistic effect on the ROP of PO and exhibited good tolerance of various functional groups to prepared diverse functionalized PPOs 36,37 .…”

Synthesis of Degradable Polyacetals via an Intramolecular Phosphonium Borane Lewis Pair Catalyzed Copolymerization of Epoxides with o-Phthaladehyde

“…Our group focused on the ring-opening polymerization (ROP) and ROAP using Lewis pair organocatalysts. 34,35 We first reported phosphonium bisborane PPB showed synergistic effect on the ROP of PO and exhibited good tolerance of various functional groups to prepared diverse functionalized PPOs. 36 We reasoned that the introduction of acetal units into the polyether backbone could effectively empower the degradability of the material and improve the scope and use of the material.…”