Hydroxy-steroids. Part XI. The preparation and infrared spectra of vicinal cholestanediols
作者:C. W. Davey、E. L. McGinnis、J. M. McKeown (née Chancellor)、G. D. Meakins、M. W. Pemberton、R. N. Young
DOI:10.1039/j39680002674
日期:——
Twenty-eight vicinal cholestanediols (positions 1,2; 2,3; 3,4; 4,5; 5,6; 6,7; and 7,8) have been prepared by unambiguous routes starting from the corresponding olefins. The O–H stretching bands of dilute solutions of these diols and of seven reference compounds have been examined under high dispersion. Characteristic differences between ax,ax, ax,eq, and eq,eq compounds were observed. It was concluded
Steroids and Walden inversion. Part LXII. The chlorination of 5α-cholestan-1-one
作者:C. W. Shoppee、S. C. Sharma
DOI:10.1039/j39680000245
日期:——
Monochlorination of 5α-cholestan-1-one is slow and yields 28% of the axial 2β-chloro-ketone and 32% of the equatorial 2α-chloro-ketone under conditions in which the 2β-chloro-ketone undergoes inversion to the extent of 49%; the values, 28 and 32%, take account of this transformation caused by acid-catalysed enolisation. Monochlorination of the axial 2β-chloro-ketone to give the 2,2-dichloro-ketone