Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202306267
Keywords
Dehalogenative Deuteration; EPR; Metal-Organic Frameworks; Photocatalysis; SXPD
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This study reports a method for photocatalytic dehalogenative deuteration using a metal-organic framework, MFM-300(Cr), as the catalyst. The catalyst shows high deuterium incorporation and excellent tolerance to various functional groups. Synchrotron X-ray powder diffraction and in situ electron paramagnetic resonance spectroscopy reveal the mechanism and reaction pathway.
Deuterium labelling of organic compounds is an important process in chemistry. We report the first example of photocatalytic dehalogenative deuteration of both arylhalides and alkylhalides (40 substrates) over a metal-organic framework, MFM-300(Cr), using CD3CN as the deuterium source at room temperature. MFM-300(Cr) catalyses high deuterium incorporation and shows excellent tolerance to various functional groups. Synchrotron X-ray powder diffraction reveals the activation of halogenated substrates via confined binding within MFM-300(Cr). In situ electron paramagnetic resonance spectroscopy confirms the formation of carbon-based radicals as intermediates and reveals the reaction pathway. This protocol removes the use of precious-metal catalysts from state-of-the-art processes based upon direct hydrogen isotope exchange and shows high photocatalytic stability, thus enabling multiple catalytic cycles. The metal-organic framework MFM-300(Cr) acts as a photocatalyst for the dehalogenative deuteration of both arylhalides and alkylhalides (40 substrates) with high deuterium incorporation. Synchrotron PXRD reveals the activation of halogenated substrates via confined binding within MFM-300(Cr). In situ EPR spectroscopy confirms the formation of carbon-based radicals as intermediates and reveals the reaction pathway.image
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