Applications of Some Metal Hydrogen Sulfates in Organic Transformations

Abstract

Sodium, magnesium, ferric, zirconium and aluminum hydrogen sulfates have been used as efficient reagents in organic chemistry. A broad range of reactions including deprotection, oxidation, C-C, C-N and C-O bond formation and cleavage took place in the presence of these reagents under mild and completely heterogeneous reaction conditions in good to high yields. In many cases the reagents were recycled and reused. This article is dedicated to Professor Naser Iranpoor who dedicates himself to the progress of science of organic chemistry in Iran and also teaches us how to live and love.

Applications of a novel nano magnetic catalyst in the synthesis of 1,8-dioxo-octahydroxanthene and dihydropyrano[2,3-c]pyrazole derivatives

“…In continuance of our researches on the design, synthesis and use of solid acids [42], inorganic acidic salts [43] [nano-Fe 3 O 4 @SiO 2 @(CH 2 ) 3 -Imidazole-SO 3 H]Cl as a MNPs catalyst (10 mg) was added and mixed to a mixture of aromatic aldehyde (1 mmol) and dimedone (0.280 g, 2 mmol) under solvent-free conditions at 80 o C for the suitable time described in Table 3. After completion of the reaction which was identified with TLC (n-hexane/ethyl acetate: 5/3), the MNPs catalyst was recovered magnetically by adding 5 ml ethanol and the mixture was purified by recrystallization from ethanol-water (10:1), which resulted in precipitation of the expected 1,8-dioxooctahydroxanthene derivatives.…”