| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 50956 | Catalysis Communications | 2010 | 5 Pages |
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.
