Reactions of Hydrogen Peroxide. III. Tungstic Acid Catalyzed Hydroxylation of Cyclohexene in Nonaqueous Media

Synthesis of Imidazole and Theophylline Derivatives Incorporating Pyrimidine‐Fused Heterocycles Using Magnetic Nanoparticles‐Supported Tungstic Acid (MNP‐TA) Catalyst

“…The acidic catalytic site of MNP‐TA catalyst is tungstic acid (TA) which has been previously used in many organic reactions . The immobilization of this acidic fragment on different supports for synthesis of heterogeneous catalyst systems has been considered and several acid catalyst system based on TA has been prepared and applied in organic transformations .…”

Synthesis of Cyclic Peroxides

“…Thus, trioxadecalin 565 was obtained from cyclohexene in a process involving epoxide 563 and β-hydroperoxycyclohexanol 564, by treatment with concentrated H 2 O 2 and tungstic acid in acetone (40% overall yield) (Scheme 159) 473 . Similarly, treatment of epoxides 566 with anhydrous H 2 O 2 in ether gives the corresponding β-hydroperoxyalcohols 567, which condense with carbonyls in the presence of copper(II) sulfate to form trioxanes 568 (Scheme 160) 474,475 .…”

Metal-Catalysed Epoxidations of Olefins with Hydroperoxides

“…When certain catalysts (Na 2 W0 4 , Na z Mo0 4 and Na 3 V0 4 generally give the best results) are used, under neutral or basic conditions, selective epoxidation is often observed [29][30][31][32][33][34][35][36][37][38]. When certain catalysts (Na 2 W0 4 , Na z Mo0 4 and Na 3 V0 4 generally give the best results) are used, under neutral or basic conditions, selective epoxidation is often observed [29][30][31][32][33][34][35][36][37][38].…”