Full Assignment of the 13C NMR Spectra of Regioregular Polypropylenes: Methine Region

We recently reported the assignment of the Me and methylene regions in the 150 MHz 13C NMR spectra of regioregular polypropylenes with different tacticities. In this article, we complete the assignment by extending it to the methine region. Despite a comparatively low resoln., the methine resonance provides addnl. information that can be of use in the configurational anal. of these polymers. Moreover, its chem. shift spreading can be predicted quant. in terms of semiempirical methods based on the γ-gauche effect, with an appropriate choice of the parameter scheme.