Zur Dehydrierung von Steroid-allylalkoholen. Über Steroide, 174. Mitteilung
作者:K. Heusler、J. Kalvoda、P. Wieland、A. Wettstein
DOI:10.1002/hlca.19610440124
日期:——
Secondary allylic alcohol groups in polyhydroxy-steroids can be dehydrogenated selectively by the OPPENAUER method under mild conditions. This is exemplified by the preparation of testosterone and of a number of 20-hydroxy-Δ4-pregnene-3-ones.
The effects of C11-substituents on the hydroxylation of Δ1,4-3-oxosteroids with osmiumtetroxide, have been examined. The 11α-substituents, such as 11α-hydroxy, 1α-acetoxy or 11α-methyl-11β-hydroxy groups, result in the selective addition of osmiumtetroxide at the Δ4 double bond, giving 4β,5β-dihydroxy-Δ1-3-oxosteroids. On the other hand, the 11-oxo yields exclusively 1α,2α-dihydroxy-Δ4-3-oxosteroids
Temperature indicating material and temperature monitoring member
申请人:Toshiba Tec Kabushiki Kaisha
公开号:EP1026221A2
公开(公告)日:2000-08-09
In the present invention, a temperature indicating material is prepared by incorporating, in a rewritable base system which comprises an electron donating compound, an electron accepting compound and a reversal material and undergoes color changes with temperature and time, a thermochromism controller which changes a rate of crystal to amorphous or phase-separation to non-phase-separation rate. Upon color changes with an environmental temperature, the thermochromism controller undergoes crystallization or phase separation to have a function as a place for reaction and contributes to the color changes of the temperature indicating material. The incorporation of the thermochromism controller therefore makes it possible to impart the resulting temperature indicating material with improved sensitivity to temperature at around an environmental temperature and a high S/N ratio.
Steroids. XLIII.<sup>1</sup> A Ten Step Conversion of Progesterone to Cortisone. The Differential Reduction of Pregnane-3,20-diones with Sodium Borohydride<sup>2</sup>
作者:O. Mancera、Howard J. Ringold、Carl Djerassi、G. Rosenkranz、Franz Sondheimer