The syntheses of 2,9,14-trimethyl-10,11,12,13-tetradehydrocyclotricosenone (6) and 2,11,16-trimethyl-12,13,14,15-tetradehydrocyclopentacosenone (7) are described. Examination of the 1H n.m.r. spectra indicates that (6) is diatropic, whereas (7) is paratropic, and these ring currents are increased by dissolution in deuteriotrifluoroacetic acid.
J. Ojima, K. Wada and M. Terasaki, J. Chem. Soc., Perkin Trans. 1, 1982, 51 DOI: 10.1039/P19820000051
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