Phosgene → HCID 13937616, compound

Participants

Reaction Steps

A suspension of 8.4 g of the product from Example 5 and 0.1 g of 1,4-diazabicyclo[2.2.2]octane (DABCO) in 75 ml xylenes was heated to reflux temperature. To this stirred solution was added 2 ml of phosgene at a rate that maintained the temperature above 130°. When the addition was complete, the turbid solution was heated at reflux temperature for 15 minutes, allowed to cool, and then filtered under an atmosphere of nitrogen. Removal of the solvent from the filtrate afforded the product as a viscous brown oil which was dissolved in dry methylene chloride and carried on to the next step without purification. The infrared spectrum of this intermediate displayed a characteristic isocyanate absorption at 2215 cm-1 and a carbonyl stretching absorption at 1730 cm-1.

Provenance & Evidence