Carbon‐13 NMR of 1,2‐polybutadienes: Configurational sequencing

Carbon‐13 Fourier‐transform spectra (67.88 MHz) of 1,2‐polybutadienes (PBDs) (I–IV) were obtained. The triad and pentad intensities were calculated for the olefinic methylene carbon (C‐1). Bernoullian and first‐order Markov‐chain propagation statistics were tested to fit the experimental data. The pentad placements for the olefinic methine carbon (C‐2) were also assigned using the data calculated for the C‐1 carbon. Fine‐structure splitting due to placements higher than pentads was observed for both C‐1 and C‐2 carbons in PBD samples III and IV.