A visible-light-promoted transfer hydrogenation of azobenzenes has been developed. In the presence of Bpin and upon visible-light irradiation, the reactions proceeded smoothly in methanol at ambient temperature. The azobenzenes with diverse functional groups have been reduced to the corresponding hydrazobenzenes with a yield of up to 96%. Preliminary mechanistic studies indicated that the hydrogen atom comes from the solvent and the transformation is achieved through a radical pathway.
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| http://dx.doi.org/10.1021/acs.joc.1c00394 | DOI Listing |
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