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Králová, Dana ; Philipp, Maximilian ; Schmalzbauer, Matthias ; Reiter, Thilo ; Schäfer, Bernd ; Gschwind, Ruth M. ; König, Burkhard

Photocatalytic Vanadium‐Mediated Amination of Benzene With Hydroxylamine

Králová, Dana , Philipp, Maximilian , Schmalzbauer, Matthias, Reiter, Thilo, Schäfer, Bernd, Gschwind, Ruth M. and König, Burkhard (2026) Photocatalytic Vanadium‐Mediated Amination of Benzene With Hydroxylamine. Chemistry – A European Journal.

Date of publication of this fulltext: 31 Mar 2026 05:51
Article
DOI to cite this document: 10.5283/epub.79062


Abstract

The synthesis of aromatic amines, especially anilines, is crucial in organic chemistry because of their significance in pharmaceuticals and high-value chemicals. However, traditional methods for producing aniline involve pre-functionalization and/or several high-energy-demanding steps. Therefore, the development of direct protocols towards aniline has attracted significant interest. We introduce ...

The synthesis of aromatic amines, especially anilines, is crucial in organic chemistry because of their significance in pharmaceuticals and high-value chemicals. However, traditional methods for producing aniline involve pre-functionalization and/or several high-energy-demanding steps. Therefore, the development of direct protocols towards aniline has attracted significant interest. We introduce a direct photocatalytic method for synthesizing aniline using hydroxylamine and vanadium complexes. While previous studies describe vanadium complexes and hydroxylamine in thermally driven reactions, our research utilizes photochemistry, providing milder reaction conditions for the efficient benzene amination. Mechanistic investigations using 51V-NMR support coordination of hydroxylamine to vanadium and the multifaceted role of acetic acid as solvent, acid, and ligand. X-band EPR and 51V-NMR demonstrated the time-dependent reduction of vanadium by hydroxylamine. The same excess experiments and 15N-NMR coordination studies identified product inhibition by aniline. 1H-NMR kinetic experiments, enabled through a broad peak suppression, suggest a paramagnetic V+4-hydroxylamine complex as the key intermediate, and 51V-NMR kinetics support the photocatalyst's role in maintaining the redox cycle and reducing the active V+4-hydroxylamine intermediate. Our direct photocatalytic method not only enables the selective synthesis of aniline under mild conditions, but also allows easy scaling through its compatibility with flow systems.



Involved Institutions


Details

Item typeArticle
Journal or Publication TitleChemistry – A European Journal
Publisher:Wiley
Date28 March 2026
InstitutionsChemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Burkhard König
Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. Ruth Gschwind
Identification Number
ValueType
10.1002/chem.202503475DOI
Keywords51 V-NMR | aniline synthesis | kinetic analysis | photocatalysis | vanadium catalysis
Dewey Decimal Classification500 Science > 540 Chemistry & allied sciences
StatusPublished
RefereedYes, this version has been refereed
Created at the University of RegensburgPartially
URN of the UB Regensburgurn:nbn:de:bvb:355-epub-790623
Item ID79062

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