@article {7186, title = {CONTIGNASTEROL, A HIGHLY OXYGENATED STEROID WITH THE UNNATURAL 14-BETA CONFIGURATION FROM THE MARINE SPONGE PETROSIA-CONTIGNATA THIELE, 1899}, journal = {Journal of Organic Chemistry}, volume = {57}, number = {2}, year = {1992}, note = {ISI Document Delivery No.: HA466Times Cited: 56Cited Reference Count: 18}, month = {Jan}, pages = {525-528}, type = {Article}, abstract = {Contignasterol (1), a highly oxygenated steroid with the {\textquoteright}{\textquoteright}unnatural{\textquoteright}{\textquoteright} 14-beta proton configuration and a cyclic hemiacetal functionality in its side chain, has been isolated from the marine sponge Petrosia contignata. The structure of contignasterol was elucidated via spectroscopic studies of its tetraacetate 2 and its reduction product pentaacetate 5. Contignasterol (1) is the first example of a naturally occurring steroid with the {\textquoteright}{\textquoteright}unnatural{\textquoteright}{\textquoteright} 14-beta proton configuration.}, keywords = {C-13 ASSIGNMENTS, H-1, NMR-SPECTROSCOPY}, isbn = {0022-3263}, url = {://A1992HA46600024}, author = {Burgoyne, D. L. and Andersen, R. J. and Allen, T. M.} }