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C. Nmr, The mixture became completely solid after 10 seconds. The crude mixture was then crushed and 6 mL of cold diethyl ether was added followed by 1 minute stirring After filtering and washing with additional diethyl ether and water, successively, the desired isocyanurate was isolated by simple filtration without further purification General procedure for solid isocyanates 2h-k: To a solution of isocyanate (2 mmol) in EtOAc (0.5 mL) was added TDAE (9.3 µL; 0.04 mmol; 2 mol%) under air at room temperature with vigorous stirring After 15 minutes, the solvent was evaporated under reduced pressure. The resulting mixture was then crushed and 2 mL of cold diethyl ether was added followed by 1 minute stirring. After filtering and washing with additional diethyl ether and water, the desired isocyanurate was isolated by simple filtration without further purification and 2j are in agreement with those reported in the literature,3,5-tris-(3-methoxyphenyl)-1,3,5-triazinane-2,4,6-trione 2d: mp 210 °C (s, 9H), General procedure for liquid isocyanates 2a-g: TDAE (9.3 µL mol%) was added to a vial containing the isocyanate (2 mmol) under air at room temperature with vigorous stirring 6H); 13 C NMR (50 MHz, CDCl3): 147, pp.5-5, 0200.

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