Combination of Sulfite Anion and Phase Transfer Catalysts for Green Cyclotrimerization of Aryl Isocyanate

M. G. Dekamin, S. Mallakpour and M. Ghassemi, Syn. Comm. 2005, 35, 427-434. Combination of Sulfite Anion and Phase Transfer Catalysts for Green Cyclotrimerization of Aryl Isocyanate.