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- W2082807096 abstract "Abstract Pentafluorobenzoyl derivatives of estrone, estradiol-17β and testosterone were prepared and characterized by their melting point, infrared spectrum, fluorine content and R F values on thin-layer chromatograms. The stability, gas chromatographic behavior and electron affinity of these derivatives were investigated. In contrast to the 3-heptafluorobutyrates of estrone and estradiol, the corresponding pentafluorobenzoates were shown to be stable esters. The electron affinity of the 3-pentafluorobenzoates and the 3-heptafluorobutyrates of estrogens was of the same order. In the 17-position of estradiol and testosterone, introduction of the pentafluorobenzoyl group was markedly more effective in enhancing electron capturing capacity than was heptafluorobutyration. Conditions for pentafluorobenzoylation were defined under which the reaction is specific for phenolic hydroxyl groups. Of the derivatives investigated, estrone pentafluorobenzoate and estradiol-3-pentafluorobenzoate-17-heptafluorobutyrate were found to be most suitable for determination of estrone and estradiol, respectively. A method for the preparation, purification by thin-layer chromatography, and quantitation by electron capture detection -gas chromatography of these two estrogen derivatives on a sub-nanogram scale is described." @default.
- W2082807096 created "2016-06-24" @default.
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- W2082807096 date "1970-05-01" @default.
- W2082807096 modified "2023-09-25" @default.
- W2082807096 title "Stable fluorinated derivatives of estradiol-17β, estrone and other hydroxy-steroids suitable for electron capture detection — Gas chromatography" @default.
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- W2082807096 doi "https://doi.org/10.1016/s0039-128x(70)80069-1" @default.
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