The contraction of ring a in 5α-cholestane derivatives
作者:B. Fuchs、H.J.E. Loewenthal
DOI:10.1016/0040-4020(60)80070-1
日期:1960.1
The β-keto-ester which is obtained by Dieckmann cyclization of the dimethyl ester (I) of the dicarboxylic acid obtained by oxidative opening of ring A in 5α-cholestan-3-one and related compounds has been shown to have the structure IIa, by its degradation, via the unsaturated acid (Va), to A-nor-5β-cholestan-3-one (VI) and to the dimethyl ester (VIIb). The stereochemistry of compound IIa and of related
Opticalrotatorydispersion and circular dichroism measurements of a number of steroidal thiocyanates have demonstrated that a low intensity absorption near 250 nm is optically active. On the assumption that this transition of thiocyanates is qualitatively similar to the n → π* transition of azides, an octant rule is proposed for thiocyanates, which leads to the prediction of the sign of the Cotton
Optical Rotatory Dispersion Studies. XXXVI.<sup>1</sup> α-Haloketones (Part 7).<sup>2</sup> Demonstration of Boat Form in the Bromination of 2α-Methylcholestan-3-one<sup>3,4</sup>
作者:Carl Djerassi、Neville Finch、R. C. Cookson、C. W. Bird
DOI:10.1021/ja01505a044
日期:1960.10
Geminal substitution via steroidal 2- and 4-cyano-3-ones
作者:Peter Beak、Tommy L. Chaffin
DOI:10.1021/jo00832a037
日期:1970.7
1103. The acid-catalysed isomerisation of cyclopropanes