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- W2091897218 abstract "Chemical shifts of signals due to methyl groups in position 10β (in CDCl 3 ) and 4α and 4β (in C 6 D 6 ) in 1 H NMR spectra of pentacyclic triterpene 3-oxo derivatives ( V, VIII, IX , and XII ) are suitable for estimation of chair-boat equilibrium in the ring A. Benzene and lanthanide induced shifts of 4α and 4β-methyl protons were also used for this purpose. The results obtained with 2α-methyl-3-ketones ( III, X ) and 2β-methyl-3-ketones ( IV, XI ) as the respective chair and boat models agree well with those derived from other physical data (about 40% boat). The same methods were applied to 4,4-dimethylsteroid 3-ketones XV-XVII ." @default.
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- W2091897218 date "1990-01-01" @default.
- W2091897218 modified "2023-10-18" @default.
- W2091897218 title "Conformation of ring A in triterpenoid and 4,4-dimethylsteroid 3-ketones. Chemical shifts of methyl protons and lanthanide and benzene induced shifts" @default.
- W2091897218 doi "https://doi.org/10.1135/cccc19900766" @default.
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