Acid-Catalyzed Cleavage of 1,4-Dimethyl-1,4-dihydronaphthalene 1,4-Endoperoxide. Reactivity of the Resulting Hydroperoxy Carbocation with Nucleophiles
作者:Charles W. Jefford、Jean-Claude Rossier、Shigeo Kohmoto、John Boukouvalas
DOI:10.1002/hlca.19850680635
日期:1985.9.25
In the presence of acids, 1,4-dimethyl-1,4-dihydronaphthalene 1,4-endoperoxide readily reacts with nucleophiles to produce methyl- and ring-substituted naphthalenes in high yields. The regioselectivity observed depends on the nucleophile. The key intermediate is shown to be the corresponding hydroperoxy carbocation which could be intercepted in certain cases prior to aromatization. The hydroperoxide
A new approach was developed for Pd(II)-catalyzed aromatic coupling of oxabenzonorbornadienes with triarylphosphines as both ligands and aryl donors. Diverse functional groups including halo- (F-, Cl-, and Br-), CF3-, and furyl groups are well tolerated. For unsymmetrical triarylphosphines, the migration ability of aryls is consistent with the electronic property of substituents and maintains the order EDG-Ar > H-Ar > EWD-Ar (EDG means electron-donating group, EWG means electron-withdrawing group). A preliminary mechanistic study was also disclosed.
JEFFORD, CH. W.;ROSSIER, J. -C.;KOHMOTO, SHIGEO;BOUKOUVALAS, J., HELV. CHIM. ACTA, 1985, 68, N 6, 1804-1814
作者:JEFFORD, CH. W.、ROSSIER, J. -C.、KOHMOTO, SHIGEO、BOUKOUVALAS, J.