Reactions of thallium(I) carboxylates and iodine with alkenes
作者:Richard C. Cambie、Rodney C. Hayward、John L. Roberts、Peter S. Rutledge
DOI:10.1039/p19740001858
日期:——
Treatment of an alkene with a thallium(I) carboxylate and iodine gives the corresponding vic-iodocarboxylate in high yield. The reactions are regiospecific and in conjunction with solvolysis of the products, offer an alternative to the Prévost reaction. Differences in the behaviour of thallium(I) carboxylates and silver carboxylates towards alkenes in the presence of iodine are discussed.
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O 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 R值未始终遵循八分法则。轴向O 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O 组并非始终遵循八进制或“反八进制”行为。
Syntheses of Steroidal<i>trans</i>-Iodo Acetates
作者:C. Akira Horiuchi、J. Yasuo Satoh
DOI:10.1246/bcsj.60.426
日期:1987.1
The reaction of the following steroidal olefins with iodine–copper(II) acetate in acetic acid afforded the corresponding steroidal trans-iodo acetates: 5α-cholest-1-, -2-, and -3-ene; and 5β-cholest-1-, -2-, and -3-ene.
Über Steroide und Sexualhormone. 160. Mitteilung. 2α, 3α- und 2β, 3β-Oxido-chlolestane; Konfiguration der 2-Oxy-cholestane
作者:A. Fürst、Pl. A. Plattner
DOI:10.1002/hlca.19490320139
日期:1949.2.1
Es wurde die Konfiguration der beiden 2,3-Cholesten-oxyde und der beiden 2-Oxy-cholestane bestimmt. Unter den Acetaten von Epi-cholestanol, Cholestanol, 2α-Oxy-cholestan und 2β-Oxy-cholestan erwies sich dasjenige des letztgenannten Alkohols als am schwersten verseifbar, was mit Modellbetrachtungen übereinstimmt.