Carbon‐13 NMR of polybutadiene

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Abstract
By using the carbon‐13 NMR technique, it is shown that there are no cis‐1,4–trans‐1,4 linkages in a n‐BuLi‐catalyzed polybutadiene. The polymer consists of “blocks” of cis‐1,4 units and trans‐1,4 units separated by isolated vinyl units. Preliminary evidence suggests this might also be true for other types of 1,3‐diene polymerization. Some of the implications of this finding on the mechanism of polymerization are discussed. Tacticity triad distributions are readily determined in polybutadienes with high 1,2 addition contents.