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Organocatalytic, rapid and facile cyclotrimerization of isocyanates using tetrabutylammonium phthalimide-N-oxyl and tetraethylammonium 2-(carbamoyl)benzoate under solvent-free conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
50956 46823 2010 5 PDF Available
Title
Organocatalytic, rapid and facile cyclotrimerization of isocyanates using tetrabutylammonium phthalimide-N-oxyl and tetraethylammonium 2-(carbamoyl)benzoate under solvent-free conditions
Abstract

Tetrabutylammonium phthalimide-N-oxyl and tetraethylammonium 2-(carbamoyl)benzoate were found to be effective and easily accessible organocatalysts for selective cylotrimerization of aryl and alkyl isocyanates under mild reaction conditions. The reaction proceeds smoothly using very low catalyst loadings of these metal-free organocatalysts (0.025 and 0.25 mol%, respectively) under solvent-free conditions at room temperature within a very short reaction time.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights►Cyclotrimerization of isocyanates is a very important reaction in manufacturing of coating materials such as polyurethanes. ►Organocatalytic protocols demonstrate considerable advantages over traditional catalytic systems. ►Cylotrimerization of isocyanates is catalyzed by tetrabutylammonium phthalimide-N-oxyl (1) and tetraethylammonium 2-(carbamoyl)benzoate (2) as efficient organocatalysts. ►High to quantitative yields of the products were obtained under mild reaction conditions.

Keywords
Isocyanate cylotrimerization; Polyurethanes; Coating materials; Organocatalysis; Tetrabutylammonium phthalimide-N-oxyl; Tetraethylammonium 2-(carbamoyl)benzoate
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Organocatalytic, rapid and facile cyclotrimerization of isocyanates using tetrabutylammonium phthalimide-N-oxyl and tetraethylammonium 2-(carbamoyl)benzoate under solvent-free conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 3, 30 November 2010, Pages 226–230
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us