Polyethylene glycol as a non-ionic liquid solvent for polyoxometalate catalyzed aerobic oxidation

Abstract

The H5PV2Mo10O40 polyoxometalate in a polyethylene glycol solvent was effective for a series of aerobic oxidation reactions including oxydehydrogenation of alcohols and cyclic dienes, oxidation of sulfides and the Wacker reaction; the solvent-catalyst phase can be recovered and recycled.

An environmentally benign and efficient synthesis of 2-thio-substituted benzothiazoles

“…It has benign characteristic properties with respect to environment and chemical industry such as low cost, low flammability, low toxicity, recyclability, facile degradability, and miscibility with various organic solvents likes toluene, dichloromethane, alcohol, and acetone [11], compared to ionic liquids, supercritical fluids, and micellar systems [12]. Polyethylene glycol is compatible with several organic synthetic transformations like substitution reactions [13], oxidation and reduction reactions [14], Heck reaction [15], asymmetric dihydroxylation [16], Suzuki cross-coupling reaction [17], Wacker reaction [18], and partial reductions of alkynes [19].…”

Polyethylene glycol (PEG-400) as a medium for novel and efficient synthesis of 2-phenyl-2,3-dihydroquinazolin-4(1H)-one derivatives

“…In past decades, polyethylene glycol (PEG-400) has acquired significance as an eco-friendly solvent in many organic reactions, and economically viable, non-hazardous, and nontoxic green solvent. On the other hand, PEG also acts as a phase transfer catalyst and is used in many synthetic organic transformations [16] such as oxidation, reduction reactions [17], and Suzuki cross-coupling reaction [18], Wacker reaction [19], and Heck reaction [20]. …”

A green methodology for one-pot synthesis of polysubstituted-tetrahydropyrimidines using PEG

“…In general, polyethylene glycol (PEG) and their monomethyl ethers are inexpensive (17), thermally stable, non-toxic (18,19), being used in food products, cosmetics, and potentially recyclable (20,21). PEG is water miscible which facilitates its removal from reaction products found wide applications as a medium for phase transfer catalysts (22,23). Recently, great attention has been focused on the use of PEG as a benign, alternative reaction medium in the synthesis of various organic compounds (24,25).…”