Abstract

A method for the detection and identification of <i>cis-trans</i> isomers of trialkyl ethylenes has not been established. Greenlee and Wiley, Hively, and Rummens, have attempted to develop methods that employ boiling-point differences, gas-chromatographic retention times, and rehybridization concepts, respectively. Corish has developed a method that employs an absorption band near 4065 cm⁻¹ to determine the <i>cis</i> content in polyisoprenes. We have investigated the near- and middle-infrared regions in an attempt to relate absorption bands that are produced by <i>cis-trans</i> polyisoprenes to bands produced by isomers of other similar trialkylethylene structures. In our study, the R₁–CH=C CH₃R₂ structures were investigated where R₁ is an alkyl group and R₂ is an alkyl substituent other than a methyl group. The Rule 10.11 of IUPAC <i>Notation for Organic Compounds,</i> has been used for the <i>cis-trans</i> nomenclature. This consists of designating the compounds with the two longest chains on the same side of the double bond as being in the <i>cis,</i> and on opposite sides of the double bond as being in the <i>trans</i> configurations.

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