Acetic Acid → N-(3-chloropropyl)-6-acetyl-2-benzoxazolinone

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A mixture of N-(3-chloropropyl)-2-benzoxazolinone (8.5 g, 40 mmol), polyphosphoric acid (100 g), and acetic acid (2.4 g, 2.3 ml, 40 mmol), was stirred and heated at 100° C. for 2 hours. The hot solution was poured into ice-water to deposit a yellow gum. The mixture was extracted with dichloromethane, and insolubles were filtered. The dichloromethane extract was washed with water, dried (K2CO3), and concentrated to afford 6.4 g of a slightly green solid. This was recrystallized from ethanol (95%) to yield N-(3-chloropropyl)-6-acetyl-2-benzoxazolinone as a brown solid, 3.5 g, m.p.=100°-103° C.

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