Jg. Rodriguez et A. Perales, MOLECULAR-STRUCTURE AND ABSOLUTE-CONFIGURATION OF 2,3-DIDEHYDRO-1-BETA,10-BETA-EPOXYPSILOSTACHYIN-B (ISOPAULITIN), Journal of natural products, 58(4), 1995, pp. 564-569
The molecular structure, conformational analysis, and absolute configu
ration of isopaulitin [1], a sesquiterpene lactone, have been determin
ed by single-crystal X-ray diffraction analysis. The correlation betwe
en the position and stereochemistry of the gamma-lactone fusion to the
cycloheptane ring and the sign of the Cotton effect of the n-pi tran
sition of the C=C-C=O chromophore in 1 has been analyzed.