A chemically functionalized nanocrystalline TiO2 grafted ruthenium(II) polyazine complex was found to be an efficient visible light photoredox catalyst for the oxidative cyanation of tertiary amines to the corresponding α-aminonitriles in high to excellent yields, using molecular oxygen as an oxidant and sodium cyanide in acetic acid as a cyanide source. The developed photoredox catalyst could be easily recovered by simple filtration and reused for several runs with consistent catalytic activity.
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Kumar et al. (2014) studied this question.
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