The lithium derivatives prepared from 5-bromo-2,4-bis-O-trimethylsilyluracil and 5-bromo-2,4-bis-NO-trimethylsilylisocytosine rearrange rapidly to form the corresponding 5-trimethylsilyl compounds, but the lithium derivative from 5-bromo-2,4-bis-NO-trimethylsilylcytosine does not.
I. Arai and G. D. Daves, J. Chem. Soc., Chem. Commun., 1976, 69 DOI: 10.1039/C39760000069
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