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- W2090969345 abstract "Polycyclic ketones react reversibly with methanol, ethanol, and isopropanol in presence of hydrogen chloride. Treatment of 5α-cholestan-3-one (2) in acidic methanol solution gives the crystalline dimethyl ketal (7). In optically active substances, the percentage of ketal formed is easily followed by RD and CD, and is a function of structural and stereochemical factors. Furthermore, the reversibility of the ketone ⇌ ketal reaction is strongly dependent on the amount of water present in the reactive medium. On montre que les céto-stéroides en solution dans le méthanol conduisent à un diméthyl acétal en milieu acide. L'étude par dichroisme circulaire révèle que tant la structure que la stéréochimie du composé cétonique, comme la nature de l'alcool utilisé gouvernent l'équilibre cétone ⇌ cétal. Celui-ci dépend également de la quantité d'eau présente dans le milieu." @default.
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- W2090969345 date "1970-01-01" @default.
- W2090969345 modified "2023-09-27" @default.
- W2090969345 title "A new circular dichroism study of ketal formation of some steroidal ketones" @default.
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- W2090969345 doi "https://doi.org/10.1016/s0040-4020(01)93146-1" @default.
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