1-[2-(2,5-dioxopyrrol-1-yl)phenyl]pyrrole-2,5-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The procedure of Example 1 is repeated using 5.33 g (25 mmole) of N,N-dibenzylhydroxylamine and 3.35 g (12.5 mmole) of N,N'-ortho-phenylenedimaleimide. The residue is purified by preparative HPLC (Silica gel: 7:3 heptane:ethyl acetate eluent) to give 5.9 g (34%) of a white solid. The residue is purified by preparative HPLC (Silica gel: 7:3 heptane:ethyl acetate eluent)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The title compound is prepared from N,N'-1,2-phenylenedimaleimide and 4-benzoyloxy-1-hydroxy-2,2,6,6-tetramethylpiperidine according to the general procedure of Example 6.