Nitric acid in the presence of supported P2O5 on silica gel: an efficient and novel reagent for oxidation of sulfides to the corresponding sulfoxides

Basic ionic liquids. A short review

“…Many stoichiometric oxidants are known for the oxidation of alcohols such as chromates, hypochlorites, permanganates, and others, however many of these oxidants are toxicand produce large amounts of wastes [140][141]. Much attention is being directed to newer and selective methods of oxidations.…”

P2O5/SiO2 as a New, Efficient and Reusable Catalyst for Preparation of 4,4′‐Epoxydicoumarins Under Solvent‐free Conditions

“…Phosphorus pentoxide/silica gel (P 2 O 5 /SiO 2 ) is inexpensive, green, commercially available and heterogeneous catalytic system which has been used in several organic transformations, such as synthesis of N-sulfonyl imines 4 , condensation of indoles with carbonyl compounds 5 , esterification 6 , oxidation of sulfides to sulfoxides 7 , schmidt reaction 8 , Fries rearrangement 9 , direct sulfonylation of aromatic rings 10 , oxime preparation 11 , conversion of aldehydes to acylals 12 , selective deprotection of 1,1-diacetals 13 and acetalization of carbonyl compounds 14 .…”

Zr(HSO4)4 catalyzed one-pot strecker synthesis of α-amino nitriles from aldehydes and ketones under solvent-free conditions

“…In continuation of our efforts to develop new methods in organic synthesis [27][28][29], we found out that zirconium hydrogen sulfate has many advantages over sulfuric acid alone. This reagent is safe and environmentally benign and presents fewer disposal problems.…”