Abstract: The active radicals produced in the photochemical hydrogen abstraction reactions between benzophenone and ethers or phenols have been studied by combination of sqin trapping reagent 2,4,6-tri-t-butylnitrosobenyene (TEN) by ESR spectroscopy. Results demostratethat benzophenone can abstract hvdrogen from a-c adjacent to oxygen of ethers as follows.
ϕ₂CO+ROR→ϕ₂ĊOH+R'ĊHOR
And the R'ĊHOR reacts with TBN to form either Nitroxide(I) or N-alkoxyanilino spin adducts. For the case of phenols, benzophenone abstracts hydrogen from phenolic hydroxyl of phenols to from phenoxy radicals (R-O-Ȯ). They also react with TEN to formeither(I) or (Ⅱ) spin adducts.