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• W2002306880 abstract "The triplet excited aromatic ketones benzophenone, xanthone, thioxanthone, fluorenone, benzil and 4,4′-dimethoxybenzophenone sensitize the dediazoniation of arene diazonium salts. The quantum yields of the photolyses of benzene diazonium tetrafluoroborate in the presence of these ketones and of 4-chlorobenzene diazonium tetrafluoroborate, 4-methyl-benzene diazonium tetrafluoroborate and 4-methoxybenzene diazonium tetrafluoroborate in the presence of benzophenone were determined. In almost all cases the reduction products are of the Ar—H type (Ar ≡ aryl) which is characteristic of the electron transfer mechanism. The photochemically induced dynamic nuclear polarization (photo-CIDNP) of 4-chlorobenzene diazonium tetrafluoroborate and 4-cyanobenzenediazonium-β-15N tetrafluoroborate in the presence of the ketones under investigation was also studied. In all cases except fluorenone the signs of the photo-CIDNP effects clearly point to triplet precursors. The photo-CIDNP effect in the presence of fluorenone has the same sign as that or pyrene which is known to react via the excited singlet state. This is because of the long lifetime of the excited singlet state of fluorenone which is efficiently trapped by the diazonium salt. These results suggest that the dediazoniation of arene diazonium salts sensitized by aromatic ketones proceeds via electron transfer but not via energy transfer." @default.
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• W2002306880 date "1985-03-01" @default.
• W2002306880 modified "2023-09-24" @default.
• W2002306880 title "Dediazoniation of arene diazonium salts by triplet excited aromatic ketones: electron or energy transfer?" @default.
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• W2002306880 doi "https://doi.org/10.1016/0047-2670(85)85041-3" @default.
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