Abstract

Conformational analysis suggests that thujopsene (1) can exist as 2 possible conformations, steroidal and nonsteroidal. The conformation of 1 has been investigated using a NMR spectroscopic method. Analyses of the 1H NMR, ROESY, and long-range 1H-1H COSY spectra indicate that 1 exists in a steroidal conformation. Although the conformations of related compounds 2 and 3 were originally assigned as nonsteroidal, careful reexamination of the published NMR data indicates that both compounds exist in a steroidal conformation.

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