Abstract
The 13C NMR spectra of cis-syn-cis and cis-anti-cis-1,7-dimethyl-4-isopropylidene-tricyclo[5.3.0.0 2,6]decan-3-ones, and their two trans-fused cyclopentanone isomers, as well as that of 1,7-dimethyl-4-isopropylidene-tricyclo-[4.4.0.0 2,7]decan-3-one are analysed. Chemical shifts at unusually high fields are observed for the carbonyl carbon signals of the two trans-fused cyclopentanone isomers.
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