Polystyrene-Supported Carbodiimide Catalysts

Article abstract of DOI:10.1021/jo00172a044

Polystyrene-anchored triphenylarsine oxide 8 has been prepared from brominated polystyrene beads by a lithium-mediated arsenation-hydrogen peroxide oxidation sequence.Compound 8 with only 0.6 mequiv of As/g has been found to be a highly effective, insoluble catalyst for the conversion of aryl isocyanates to diarylcarbodiimides in high yield.Up to 5.6 x 10⁴ turnovers of the catalyst 8 in the carbodiimide-forming reaction have been measured when appropriate measures are taken to prevent its deactivation.Several arylcarbodiimides have been prepared in high yield by using 8.