“…Cunneen, Higgins, and Watson (24B) described an infrared method for the analysis of cis and trans double bonds in polyisoprene, and Corish (235) attacked the same problem by the use of the near-infrared region. Kasatkina (435) analyzed for 1,4; 3,4; and 1,2 linkages in synthetic polyisoprenes bj' comparing rates of oxidation of the rubbers in benzoyl hydroperoxide with those of model compounds; Yakubchik and Filatova (7,95) applied a similar technique to sodium butadiene rubber. Several articles (45B, 575, 555) have appeared in which infrared spectroscopy has been employed in the determination of unsaturation in butadiene polymers.…”