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- W1976229080 abstract "This paper describes a simple and convenient method for the preparation of tritiated mestranol and ethinylestradiol of high specific activity as a prerequisite in the development of the radioimmunoassay of the unlabelled compounds. Radioactive mestranol was prepared from estrone-6,7- 3 H (40 Ci/mmole) by methylation followed by ethinylation and purification by TLC. Radioactive ethinylestradiol could not be made from this mestranol by demethylation with boron tribromide, but it could be made directly from estrone-6,7- 3 H by ethinylation, removing the unreacted estrone by Girard's reagent T and purifying the product by TLC. Purities of these compounds were checked by TLC in two solvent systems and finally by the isotopic dilution technique. The specific activity of the final products was calculated by determining the loss of tritium during each step of reaction with a double isotopic method." @default.
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- W1976229080 date "1974-02-01" @default.
- W1976229080 modified "2023-09-27" @default.
- W1976229080 title "Radioimmunoassay of contraceptive steroids II. Synthesis of 6,7-3H-mestranol and ethinylestradiol of high specific activity" @default.
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- W1976229080 doi "https://doi.org/10.1016/0039-128x(74)90148-2" @default.
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