6939-33-9Relevant articles and documents
Substituent-induced regioselective hydroxylation of the aromatic C-H bond on naphthalene with metachloroperbenzoic acid catalyzed by F20TPPMnCl
Chen, Chang-Di,Sheng, Wen-Bing,Shi, Guo-Jun,Guo, Can-Cheng
, p. 23 - 29 (2013/03/13)
The regioselective hydroxylation of the aromatic C-H bond on a series of naphthalenes with different β-substituent R (R = H, Me, Et, i-Pr, OMe, COOH, Br, etc.) was studied, and the substituent effect on the regioselectivity was investigated. The electron-donating substituent afforded the aromatic C-H bond hydroxylation at the 1α position with more than 80% selectivity, while the electron-withdrawing substituent afforded the aromatic C-H bond hydroxylation at the 4α position with more than 60% selectivity of β-substituted naphthalene hydroxylated with metachloroperbenzoic acid catalyzed by tetrakis(pentafluorophenyl)porphyrin manganese(III) chloride. The research showed that the steric and electronic effects of the substituent appeared to play a significant role in determining the regioselectivity, and the electronic effect was of more importance than the steric effect of the substituent in the current situation. The studies may provide additional proofs for the stepwise mechanism of the aromatic C-H bond hydroxylation through a cationic intermediate. Copyright
ARYNIC SPECIES; EFFECT OF SUBSTITUENTS ON THE REACTIVITY OF MONOSUBSTITUTED DEHYDROBENZENES
Gavina, F.,Luis, S. V.,Costero, A. M.
, p. 155 - 166 (2007/10/02)
Evidence is presented demonstrating the existence of free dehydrobenzenes in the thermal decomposition of diaryliodonium-2-carboxylates, and that o-benzyne itself and its 4-methyl-, 4-chloro-, 4-bromo- and 4-nitro-derivatives are generated from insoluble polymer-bound precursors and trapped by a second solid phase in Diels-Alder reactions.Lifetimes for these elusive species are determined.
GENERATION OF MONOSUBSTITUTED o-BENZYNES FROM POLYMERIC REAGENTS VIA HETEROLYTIC FRAGMENTATIONS
Gavina, F.,Luis, S.V.,Gil, P.,Costero, A.M.
, p. 779 - 782 (2007/10/02)
Generation of four 4-substituted o-benzynes by heterolytic fragmentation reactions is demonstrated.