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An unprecedent, efficient, and convenient lab-scale protocol for stable deuteration of Mesalamine, with mixed catalyst 10% Pd/C (10wt%) and 10% Pt/C (25wt%) at 145°C, using D2O as deuterium source, in hydrogen atmosphere, is reported. The nature of reactive species with Pd/C–Pt/C–D2O–H2 system is suggested to be of electrophilic nature D+ type.
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