The X-ray crystal structures of a number of 6-ketoestra-1,3,5(10)-trien-17-ones and 6-ketoestra-1,3,5(10)-triene-17-one 17-O,O-acetals have been determined and the effect of the acetal group on the conformation of rings B and D are discussed.
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4.
The ring analyses were carried with help of PLATON software (SpekA.L., J. Appl. Cryst., 2003, 36, 7) using ring puckering analysis by Cremer and Pople: D. Cremer and J.A. Pople, J. Am. Chem. Soc., 1975, 97, 1354 with the percentages of half chair and envelope conformations according to G.G. Evans and J.A. Boeyens, Acta Cryst., 1989, B45, 581.
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6.
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