Phenyl isocyanate → HCID 20492382, compound

Participants

Reaction Steps

A mixture of 3.0 parts of the product from Example 81, 0.90 parts of phenyl isocyanate and 0.1 parts of 1,4-diazabicyclo[2,2,2]octane in 25 parts of dry benzene was heated under reflux conditions for 24 hours. The benzene solvent was removed by distillation under reduced pressure and the residue crystallised from petroleum ether (b.p. 60°-80° C.) to give 4-phenylcarbamoyloxy-1-[2'-(phenylcarbamoyloxy)-2'-phenylethyl]-2,2,6,6-tetramethylpiperidine having a melting point of 173° C. and the following elemental analysis by weight:

Provenance & Evidence