Bromide‐Assisted Oxidation of Substituted Phenols with Hydrogen Peroxide to the Corresponding p‐Quinol and p‐Quinol Ethers over WO₄²⁻‐Exchanged Layered Double Hydroxides

Abstract

Einfach und effizient verläuft die Eintopfsynthese von Hydroxycyclohexadienonen (Chinolen) und ihren Ethern über Wolfram‐ausgetauschten Schichtdoppelhydroxiden (WO42−‐LDHs). Diese Hydroxide katalysieren die Brom‐gestützte Oxidation substituierter Phenole zu den 4‐Alkoxy‐ und 4‐Hydroxycyclohexa‐2,5‐dienonen in hoher Ausbeute (siehe Schema).

Fe3O4 Core/Layered Double Hydroxide Shell Nanocomposite: Versatile Magnetic Matrix for Anionic Functional Materials

“…This catalyst also shows high catalytic activities in oxidative alkoxylation of mesitol with various alcohols (see the Supporting Information). [21][22][23] In summary, we have demonstrated the fabrication of magnetic core/LDH shell structure and its use as recoverable support for nanocatalysts. This composite structure possesses high anion loading capacity and can be conveniently separated.…”

Oxidative De‐aromatization of para‐Alkyl Phenols into para‐Peroxyquinols and para‐Quinols Mediated by Oxone as a Source of Singlet Oxygen

“…Among the numerous methods described for the preparation of para ‐quinols,7 hypervalent iodine( III ) oxidants such as (diacetoxyiodo)benzene (PIDA) and [bis(trifluoroacetoxy)iodo]benzene (PIFA) have usually been the reagents of choice for the oxidation of para ‐alkyl phenols 10. Very recently, Jacobs and co‐workers reported the oxidation of para ‐substituted phenols to form para ‐quinol ethers in which H 2 O 2 was used in the presence of a tungstate‐exchanged layered double hydroxide catalyst 11…”

Fe3O4 Core/Layered Double Hydroxide Shell Nanocomposite: Versatile Magnetic Matrix for Anionic Functional Materials

“…The catalyst could be effectively recycled and reused six times without any apparent decrease in its catalytic activity (Table 1). This catalyst also shows high catalytic activities in oxidative alkoxylation of mesitol with various alcohols (see the Supporting Information) 21–23…”