Oxidation of the diastereoisomeric phosphonate diesters of d(TpA)(3a) or (3b) with sulphur showed that the reaction is stereospecific and proceeds with retention of configuration; oxidation with I2–H218O, however, leads to (Sp)-[18O]d(TpA), preferentially, regardless of the diastereoisomeric phosphonate diester used.
F. Seela and U. Kretschmer, J. Chem. Soc., Chem. Commun., 1990, 1154 DOI: 10.1039/C39900001154
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