Abstract
AbstractThe irradiation of water solution of cytidine with UVC light showed that the compound participates in a tautomerism following the kinetics of a first‐order reaction. The PIDA mechanism showed that the proton detachments in the tautomers of cytidine occur through the repulsive 1πσ* excited states and lead to conical intersections S0/S1, whose structures were optimized. More probable is the IRC mechanism, which proceeds along 1nπ* excited state reaction paths. This mechanism includes a water molecule as a catalyst, which assists the phototransformation of amino‐oxo tautomer of cytidine into imino‐hydroxy one.
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