A nitrous acid complex was identified by spectroscopic and kinetic analyses under stopped-flow conditions as an intermediate in the reaction of copper(I) nitrite complex 1 with trifluoroacetic acid (see scheme). A reaction mechanism was proposed in which two protons are transferred in a stepwise manner to the nitrite anion. Intramolecular electron transfer from copper to the nitrite ligand occurs in the second protonation step.
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Kujime et al. (2006) studied this question.
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