Experimental evidence is presented indicating that hydrolysis of an ester by superoxide in an aprotic solvent does not proceed via the corresponding acyl peroxide, although the peroxycarboxylate anion is involved.
Deuterium Isotope Effects in Some Acid-catalyzed Cyclizations of 2-Deuterio-2'-carboxybiphenyl
作者:Donald B. Denney、Peter P. Klemchuk
DOI:10.1021/ja01546a025
日期:1958.7
2-Deuterio-2'-carboxybiphenyl has been cyclized to fluorenone with sulfuric acid, polyphosphoric acid and anhydrous hydrogen fluoride. The isotope effects for these reactions have been determined. Hydrogen fluoride cyclization exhibited a kHKD of 3.02, whereas the other acid-catalyzed cyclizations had isotope effects in the range 1.13-1.46. The significance of these results is discussed with respect
Bis(2-phenylbenzoyl) peroxide (2-PhBPO) photodecomposed by 100% O–O bond cleavage to give mainly biphenyl-2,2′-carbolactone on 313 nm irradiation, however, on 254 nm, the photodecomposition proceeded through 60% two bonds cleavage (simultaneous C–C and O–O bonds cleavage).
Bis(2-phenylbenzoyl) peroxide (2-PhBPO) was found to decompose on singlet and triplet sensitized irradiations in benzene and carbon tetrachloride. The quantum yields were determined to be 0.48 and 0.43 on direct excitation and chrysene sensitization in benzene, respectively, and 0.62 and 0.60 on benzophenone and 3′-methoxyacetophenone sensitizations in carbon tetrachloride, respectively. The reaction