Probing Site Cooperativity of Frustrated Phosphine/Borane Lewis Pairs by a Polymerization Study

The first highly active phosphine (P)/borane (B) Lewis pair polymerization is promoted unexpectedly by P–B adducts. The P and B site cooperativity is essential for achieving effective polymerization, as shown by this study examining the reactivity of a library of P/B Lewis pairs toward polymerization of a renewable acrylic monomer.