Triad polymer side-chain carbon

The Triad Chemical Shift Sequence with Respect to an Increasing Field Strength for Some Representative Vinyl Polymer Side-Chain Carbon Resonances... 

In agreement with the data on poly-a-olefins and poly-vinyl-ethers having the side chain asymmetric carbon atoms in the y-position with respect to the main chain, stereoregularity does not exert a remarkable influence on the rotatory power of poly-acrylates and poly-methacrylates. In fact, according to the quantitative data reported by H. Sobue, K. Matsuzaki, S. Nakano (135), and to the qualitative indications given by Liu, Szuty and Ullmann (64), concerning respectively poly-menthyl-meth-acrylate and poly-(l-methyl-benzyl)-methaciylate, the specific optical activity of the polymers does not vary by more than 30% when varying, within a wide interval, the isotactic triads content of the polymers (Table 18). 

Data for other polymers may generally be found in the appropriate referenee see Ch. 12. and 13. The signals for C-1,2 double-bond triads are resolved but cannot be fully assigned in 100 MHz spectra they are not resolved in the spectra of polymers of cyclodecene or cyclododecene (Dounis 1995). tcc, etc. denote double-bond triads. The central letter refers to the double bond in which the carbon is situated, the first letter refers to the next nearest double bond, and the third letter to the double bond on the other side of the central double bond. The sequence Icc thus correspponds to the actual sequence in the chain (Greene 1986). 

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