D. Koster, T. Vasileff, G. Carlson
Sep 1, 1971
Citations
0
Influential Citations
7
Citations
Journal
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract
Abstract The rotational equilibria in fumaryl chloride, fumaryl fluoride and maleoyl fluoride have been studied by spectroscopic techniques. The fumaryl chloride and fumaryl fluoride vibrational data can be interpreted in terms of at least two isomers having C 3 , and C 2h symmetries. In dilute CS 2 solutions their relative energies appear to be about equal. There is evidence for only a C 2h species in the crystalline solids near −196°C. The relative energies of the three isomers possible for each compound can be arranged in six ways. The fumaryl fluoride and maleoyl fluoride NMR data are consistent with only two of these arrangements. In solution the ordering of the energies are either cis-trans, trans-trans, cis-cis or the forms cis-cis, trans-trans, cis-trans, where cis and trans refer to the conformation of the double bonds about the single bonds.