1. Stereochemical effects in electron impact mass spectra ofcis-trans isomeric 1,2,4,5-tetramethylcyclohexanes
2. The behavior of stereoisomeric ions in the gas phase: The Case of cyclohexane-hexacarboxylic methyl esters
3. G. Audisio, M. Grassi, S. Daolio and P. Traldi, Org. Mass Spectrom., in press.
4. At the present state of our research, we are in a position to attribute unequivocally the exact structure to the trans and cis isomers of the macrocycles, but we are not yet in a position to define which stereoisomer is syn and which is anti. Analogously as reported in the literature [5], we have arbitrarily called the compounds 1 trans-syn-trans, 2 trans-anti-trans, 3 cis-syn-cis and 4 cis-anti-cis.
5. I. J. Burden, A. C. Coxon, J. F. Stoddard and C. M. Wheatley, J. Chem. Soc., Perkin Trans. I, 220 (1977) and their references.