X-Ray analysis of the p-bromobenzenesulphonate esters of 16β-hydroxy-3-methoxy-D-noroestra-1,3,5(10)-triene and 16α-hydroxy-3-methoxy-D-noroestra-1,3,5(10)-triene has established molecular geometries of these model compounds containing conformationally rigid cyclobutane rings.
P. Coggon, A. T. McPhail, S. G. Levine and R. Misra, J. Chem. Soc. D, 1971, 1133 DOI: 10.1039/C29710001133
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