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The infrared absorption spectra, from 1 to 15 micron s, of I-b u tene, 2-methylpropene (isobutene) , cis-2-bu tene, trans-2-butene, and 1,3-butadiene have been recorded in the liquid phase under p ress ures suffi cient to liquify t hem at room temperature.
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Creitz et al. (1949) studied this question.
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