已经合成了2个α-和2个β-甲基和甲氧基-5α-胆甾烷-3-酮和3个α-和3个β-甲基-和甲氧基5α-胆甾烷-2-酮,并且它们的变温圆二色性获得并分析光谱。α轴和赤道CH3和OCH3基团的旋转强度(R)值是通过与母体酮的差异测量来确定的。(小)赤道CH3 R值未始终遵循八分法则。轴向OCH3基团不遵守Octant规则(“抗octant”行为),并在C = O n-pi过渡上施加红移。赤道OCH3组并非始终遵循八进制或“反八进制”行为。
Stereoselective reduction of C-2 substituted steroid C-3 ketones with lithium tris-(R,S-1,2-dimethylpropyl)-borohydride and sodium borohydride
作者:John F. Templeton、V.P.Sashi Kumar、R.K. Gupta、Anne M. Friesen
DOI:10.1016/0039-128x(86)90020-6
日期:1986.11
the stereoselectivereduction of steroid C-3 ketones with lithium tris-(R,S-1,2-dimethylpropyl)-borohydride and sodium borohydride was investigated. The C-2 mono- and di-substituted chloro and methyl derivatives were predominantly reduced to one of the epimeric alcohols. The 2 alpha-chloro and 2 alpha-methyl derivatives of 17 beta-acetoxy-5 alpha-androstan-3-one undergo stereoselectivereduction with
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
The octant rule VIII.∗∗For paper VII, see D. A. Lightner, J. K. Gawroński and T. D. Bouman, J. Am. Chem. Soc., 102, in press. Variable temperature circular dichroism spectra of α-methyl- and methoxyl-substituted 5α-cholestan-2- and -3-ones
作者:D.A. Lightner、F.P.C. Eng
DOI:10.1016/0039-128x(80)90102-6
日期:1980.2
synthesized and their variable temperature circulardichroismspectra obtained and analyzed. Rotatory strength (R) values for alpha-axial and equatorial CH3 and OCH3 groups are determined by difference measurements with the parent ketone. The (small) equatorial CH3 R-values do not consistently follow the OctantRule. Axial OCH3 groups do not obey the OctantRule ("anti-octant" behavior) and impose a bathochromic
已经合成了2个α-和2个β-甲基和甲氧基-5α-胆甾烷-3-酮和3个α-和3个β-甲基-和甲氧基5α-胆甾烷-2-酮,并且它们的变温圆二色性获得并分析光谱。α轴和赤道CH3和OCH3基团的旋转强度(R)值是通过与母体酮的差异测量来确定的。(小)赤道CH3 R值未始终遵循八分法则。轴向OCH3基团不遵守Octant规则(“抗octant”行为),并在C = O n-pi过渡上施加红移。赤道OCH3组并非始终遵循八进制或“反八进制”行为。
Schneider, Gyula; Mesko, Eszter; Dombi, Gyoergy, Journal of Chemical Research, Miniprint, 1987, # 1, p. 201 - 214