Abstract
Abstract The synthesis of o‐nitrosophenols from benzene (or its derivatives), hydroxylamine, and hydrogen peroxide in the presence of copper salts is generally known as the Baudisch reaction. This reaction has been reported to proceed via the simultaneous introduction of the nitroso and hydroxyl group into the adjacent position on the aromatic nucleus to form reddish violet copper salts. The free o ‐nitrosophenols, due to the formation of intramolecular hydrogen bonding, are volatile and can be obtained via acidifying the complexes with HCl followed by extraction in petroleum ether. It is also reported that the presence of copper salts is necessary to stabilize the nitrosyl radical to form stable complexes and to prevent the further oxidation. High yield has been reported when the reaction is applied to phenols.
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