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- A mixture of 3-pivaloyloxymethyladenine (100 mg) and CH3I (0.5 mL) in 10mL of MeOH was heated at 60°C for 5 h. After the solvent was removed by evaporation, 1 mL of aqueous 25% NH4OH was added and the mixture left to stand at room temperature for 2 h. After solvent was removed, product ratio of 7- and 3-methyladenines (1:1) was measured by NMR spectroscopy. Products were separated by PLC (silica gel, CHCl3-MeOH = 7:3). 9-Methyladenine (9 mg, 15% yield), adenine (15 mg, 28%) and 7-methyladenine (11 mg, 18%) were eluted in that order