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Tritium and deuterium content of the snow in Groenland

✍ Scribed by L. Merlivat; J. Ravoire; J.P. Vergnaud; C. Lorius

Book ID
115853398
Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
311 KB
Volume
19
Category
Article
ISSN
0012-821X

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## Abstract The synthesis of d, l, ‐12‐bromocamptothecin (**2d**) from camptothecin (**1**) is described. Reduction of the bromo derivative **2d** with tritium gas in the presence of palladium on carbon afforded d, l‐camptothecin 12‐^3^H having a specific activity of 29 Ci/mmol. A simpler labelling