Regioregular poly(propylene oxide), PPO, formed by simple base (KOH) and coordinate base (TPP)AlCl, (tetraphenylporphinato)aluminum chloride, ring-opening polymerization of propylene oxide, PO, has been studied by high field 13 C{ 1 H} NMR spectroscopy at various concentrations in CDCl 3 and C 6 D 6 . The original assignments of Tonelli and Schilling [ Macromolecules 1986, 19, 1337−1343] at the triad and diad sensitivity level have been extended to tetrad sensitivity.
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Chisholm et al. (2002) studied this question.
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