Gas phase infrared spectroscopy in characterization of unsaturated natural products

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Abstract
Characteristic absorptions which occur at 3028-301 1 and 970-967 cm-l in gas-phase Fourier-transform infrared spectra (FTIR) allow unambiguous determination of the configuration of the double bonds in long-chain unsaturated compounds bearing a RCH=CHR' type of bond. The intensities of these two bands indicate the number of cis or trans bonds present in linear polyunsaturated compounds. Terminal vinyl groups can be identified, even when other fbnctional groups are present, by the presence of 3085 and 914 cm-labsorptions. Compounds bearing (E,Z) or (Z,Q conjugated moieties show a characteristic "fingerprint" consisting of two bands at 978-977 and 948-946 cm.-l

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