The conformations of cis (1) and trans (2) 4-oxoperhydroazulenes have been studied by employing data from X-ray crystal structures of solid derivatives,'H NMR spectra, 13Cj XMR spectra, and molecular mechanics calculations. Related studies have been performed with the 2-tert-butyl-4-oxoperhydroazulenes 8a and 9a and the l0-methyl-4- oxoperhydroazulenes 10 and 11. Those studies suggest that the trans ketone 2 exists in ...
