A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a Article£¬once mentioned of 1806-29-7, Application In Synthesis of 2,2-Biphenol
SECOND-ORDER COMBINATION REACTION OF PHENOXYL RADICALS
Phenoxy radicals, when produced pulse radiolytically at concentrations > 1E-4 M, combine in second-order processes to give 2,2′-, 2,4′, and 4,4′-dihydroxybiphenyl as the predominant products.The ratios of these products observed under a variety of conditions, 0.73:1.73:1.00, indicate that radical combination at the ortho and para positions of the ring occurs statistically with, however, reaction at the para site favored by a factor of 2.4 over that at the ortho site.This ratio is considerably greater than the ratio of 1.55 of the unpaired spin populations at the two sites as indicated by ESR data.There is essentially no reaction at the meta position where the unpaired spin population is negative.Approximately 10percent of the radicals couple at oxygen to yield 2- and 4-phenoxyphenol.The yields of these two products are, however, considerably lower than might be expected from the unpaired spin population of 0.2 on the oxygen atom of phenoxyl.It is clear that factors in addition to the unpaired spin population are important in controlling the combination processes.Under optimum conditions these five products account for ca. 90percent of the phenoxyl radicals initially produced so that electronic disproportionation or coupling to form diphenyl peroxide is relatively unimportant.Multi-pulse experiments show that after products build up to concentrations comparable to that of the phenoxyl radical, secondary electron-transfer reactions lead to more complex products.In studies with gamma-rays at low-dose rates phenoxyl radicals predominantly react with the products so that the yields of simple combination products are very low.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Application In Synthesis of 2,2-Biphenol. In my other articles, you can also check out more blogs about 1806-29-7
Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare