SCHEDULED MAINTENANCE
The 1H n.m.r. chemical shifts, obtained at 100 MHz, of a number of cholestane, ergostane, and stigmastane analogues have been assigned. Deviations from additivity of substituent effects upon the angular methyl chemical shifts were noted for certain 14,15 disubstituted compounds. Resolution of signals from the C-25 methyl groups of stigmastanes, but not of the ergostanes, was observed.
T. A. Wittstruck, J. K. Sliwowski and E. Caspi, J. Chem. Soc., Perkin Trans. 1, 1977, 1403 DOI: 10.1039/P19770001403
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