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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. und König, Burkhard (2026) Photocatalytic Vanadium‐Mediated Amination of Benzene With Hydroxylamine. Chemistry – A European Journal.

Veröffentlichungsdatum dieses Volltextes: 31 Mrz 2026 05:51
Artikel
DOI zum Zitieren dieses Dokuments: 10.5283/epub.79062


Zusammenfassung

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.



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Details

DokumentenartArtikel
Titel eines Journals oder einer ZeitschriftChemistry – A European Journal
Verlag:Wiley
Datum28 März 2026
InstitutionenChemie und Pharmazie > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Burkhard König
Chemie und Pharmazie > Institut für Organische Chemie > Arbeitskreis Prof. Dr. Ruth Gschwind
Identifikationsnummer
WertTyp
10.1002/chem.202503475DOI
Stichwörter / Keywords51 V-NMR | aniline synthesis | kinetic analysis | photocatalysis | vanadium catalysis
Dewey-Dezimal-Klassifikation500 Naturwissenschaften und Mathematik > 540 Chemie
StatusVeröffentlicht
BegutachtetJa, diese Version wurde begutachtet
An der Universität Regensburg entstandenZum Teil
URN der UB Regensburgurn:nbn:de:bvb:355-epub-790623
Dokumenten-ID79062

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