Green and reusable homogeneous oxidative system with ceric ammonium nitrate/[Imim‐PEG₁₀₀₀‐TEMPO] for efficient aerobic oxidation of alcohols and one‐pot synthesis of benzimidazoles from alcohols under ambient conditions

Abstract

An efficient and reusable catalytic system for aerobic oxidation of alcohols and one-pot synthesis of benzimidazoles from alcohols with ceric ammonium nitrate and PEG 1000 -ionic liquid-immobilized 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) is described. This system shows excellent activity and selectivity, affording the target products with good yields. Moreover, the catalytic system can be recycled and reused without significant loss of catalytic activity after seven runs.

Cobalt-Catalyzed Sustainable Synthesis of Benzimidazoles by Redox-Economical Coupling of o-Nitroanilines and Alcohols

“…Classically, two general methods are reported which comprise the reaction of substituted o -phenylenediamines with carboxylic acid derivatives at high temperature and under strong acidic conditions (Scheme ). The second method involves the use of substituted aldehydes or alcohols and o -phenylenediamines under oxidative reaction conditions . Both these approaches, although widely applied, suffer from the limited functional group tolerance and generation of stoichiometric quantities of waste, from the leaving groups, oxidants, additives, and so forth.…”

Microwave Assisted Surfactant-Thermal Synthesis of Metal-Organic Framework Materials

“…Beyond MOF synthesis, polyethylene glycol (PEG) has been employed as an efficient "green solvent" for synthetic chemistry for many years, since it possesses a very low vapor pressure similar to ionic liquids, but is nontoxic and biodegradable [21,22]. PEG can dissolve a wide range of solutes as exemplified in intense recent research to employ PEG as a solvent for multi-component ("one-pot") synthesis reactions [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Even mineral salts may be soluble in PEG [43].…”