1961
DOI: 10.1002/cber.19610940322
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Über die Oxydation mit CrO3 in Dimethylformamid

Abstract: An einigen Beispielen aus der Steroidreihe wird gezeigt, daR sich Dimethylformamid sehr gut als Losungsmittel fur CrO3-Oxydationen von Alkoholgruppen eignet. Ketalgruppen werden trotz Zugabe von Schwefelslure als Reaktionsbeschleuniger nicht gespalten, ebensowenig wird die leicht oxydable 7-Methylengruppe in As-Steroiden angegriffen.

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Cited by 43 publications
(6 citation statements)
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“…Under these conditions a number of steroidal alcohols have been converted to ketones at room temperature in about 80 % yield [122] (see Table 12); acetonide and ketals remain unaltered. Thus, cholesterol is recovered unchanged after three weeks of exposure to the solution and only a 50 % conversion to 51X-cholestan-3-one is observed after heating 51X-cholestan-3,8-01 for 45 hrs.at 50°C.…”
Section: Oxidation Of Alcohols With Chromic Acid In Dimethylformamidementioning
confidence: 99%
“…Under these conditions a number of steroidal alcohols have been converted to ketones at room temperature in about 80 % yield [122] (see Table 12); acetonide and ketals remain unaltered. Thus, cholesterol is recovered unchanged after three weeks of exposure to the solution and only a 50 % conversion to 51X-cholestan-3-one is observed after heating 51X-cholestan-3,8-01 for 45 hrs.at 50°C.…”
Section: Oxidation Of Alcohols With Chromic Acid In Dimethylformamidementioning
confidence: 99%
“…Hydrolysis-exchange of 31 with levulinic acid in aqueous hydrochloric acid and chloroforni was very slow and only the C-5 oxime ether was cleaved. The 19-norsteroid 33 was also readily obtained from the 17-hydroxy intermediate 28 via the 3,17-diol 30 and the 3,17-diketone 32 (oxidation with chromium trioxide in dimethylformaniide [12].…”
Section: )mentioning
confidence: 99%
“…5,5 5,76 D (3,5) 6,58DD 5,82 D (3.5) 5,94 D (3,5) 5,95 D (3) ca. 6,6 (1,5+ 5,5) 5,65 D (4) 9.75 D (1) ca. 4,l ca.…”
Section: Die Konstitution Von Diacetoxyscirpenolunclassified