Synthesis of N,N′‐Disubstituted Urea from Ethylene Carbonate and Amine Using CaO.

The syntheses of carbon dioxide (CO 2 ) based industrially important chemicals have gained considerable interest in view of the sustainable chemistry and "green chemistry" concepts. In this review, recent developments in the chemical fixation of CO 2 to valuable chemicals are discussed. The synthesis of five-member cyclic carbonates via, cycloaddition of CO 2 to epoxides is one of the promising reactions replacing the existing poisonous phosgene-based synthetic route. This review focuses on the synthesis of cyclic carbonates, vinyl carbamates, and quinazoline-2,4(1H,3H)-diones via reaction of CO 2 and epoxide, amines/phenyl acetylene, 2-aminobenzinitrile and other chemicals. Direct synthesis of dimethyl carbonate, 1,3-disubstituted urea and 2-oxazolidinones/2-imidazolidinones have limitations at present because of the reaction equilibrium and chemical inertness of CO 2 . The preferred alternatives for their synthesis like transesterification of ethylene carbonate with methanol, transamination of ethylene carbonate with primary amine and transamination reaction of ethylene carbonate with diamines/β-aminoalcohols are discussed. These methodologies offer marked improvements for greener chemical fixation of CO 2 in to industrially important chemicals.

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“…Bhanage et al in 2005 carried out the same transformation using alkali metal oxides as heterogeneous base catalyst [228,229].…”

Section: Synthesis Of 13-disubstituted Symmetrical/ Unsymmetrical Ureamentioning

confidence: 99%

Carbon dioxide: a renewable feedstock for the synthesis of fine and bulk chemicals

Patil

Tambade

Jagtap

et al. 2009

Front. Chem. Eng. China

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Synthesis of N,N′‐Disubstituted Urea from Ethylene Carbonate and Amine Using CaO.

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Carbon dioxide: a renewable feedstock for the synthesis of fine and bulk chemicals

Carbon dioxide: a renewable feedstock for the synthesis of fine and bulk chemicals

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