Phenyl isocyanate → N-[2-(4-Oxo-4H-3,1-benzoxazin-2-yl)phenyl]-N'-phenylurea

Participants

Reaction Conditions

Reaction Steps

A 250 ml three-neck bottle was charged under room temperature with 12.8 g [0.05 mol] anthranoylanthranilic acid and 100 ml methylethylketone. Under stirring 5.95 g [0.05 mol] phenylisocyanate was added and heated for about 4 hours under reflux about 80° C.). After this the suspension was cooled down to about. 40° C. Then 40 ml acetanhydrid was added and then heated additionally for 3 hours. After cooling down to 10° C. the precipitate was sucked off, washed with acetone and dried at 50° C. under normal pressure.

Provenance & Evidence