Phenyl isocyanate → 3738-98-5

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Reaction Steps

With cooling, 128 g of phenyl isocyanate are added dropwise to 96 g of dimethylaminoethanol at 60°-70° C. in the course of 45 minutes. After a further 30 minutes at 65° C., low boiling constituents are removed at a pressure of 0.02 torr and a bath temperature of 90° C. The residue (218.4 g=97.6%) is a light yellow fluid and consists substantially of the above ester. Titration: 1 equivalent=208.4 g (theory 208.2). IR spectrum 3320 cm-1NH, 1720 cm-1C=O; no bands between 2000 and 2500 cm-1, i.e. isocyanate is no longer present. Small amounts of 5-10 g can be distilled in a bulb tube at 135° C./0.015 torr; larger amounts decompose on distillation.

Provenance & Evidence