Journal of Physical Organic Chemistry p. 494 - 498 (1993)
Update date:2022-08-11
Topics:
Hasegawa, Tadashi
Imada, Manabu
Yoshioka, Michikazu
On irradiation on a dry silica gel surface, 2-benzoylcyclohexanones which have the lowest n, ?* state and are devoid of methyl substituents on their cyclohexanone rings, undergo an oxidative cleavage to give adipic acid and substituted benzoic acid along with the Norrish Type II product.Irradiation of 2-chlorocyclohexanone and cyclohexane-1,2-dione on silica gel gives adipic acid.The cyclohexanoyl radical on the surface, which is produced from the α-cleavage of the 2-benzoyl group of the 2-benzoylcyclohexanones or the cleavage of the C-Cl bond of 2-chlorocyclohexanone, is suggested as the precursor of adipic acid; the radical is probably converted into cyclohexane-1,2-dione, which undergoes a secondary photoreaction to give adipic acid on the surface.
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