N-Phthaloylglycine → 2H-Isoindole-2-acetyl chloride, 1,3-dihydro-1,3-dioxo-

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A solution of 1,3-dihydro-1,3-dioxo-2H-isoindole-2-acetic acid (7.00 g) and thionyl chloride (12 mL) was stirred at reflux under nitrogen for one hour. The thionyl chloride was distilled from the reaction, and the resulting crude product was further purified by distillation via a kugelrohr apparatus (BUCHI, Flawil, Switzerland). [Bp: 160°-180° C. (oven temperature) at 10 mm Hg.]The yield of the title compound was 6.88 grams (90.2%). The structure of the title compound, and of all of the compounds synthesized in each of the subsequent examples, was confirmed by 1H NMR.

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