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A saturated aqueous solution
of Na2CO3(20 mL) was then added slowly over a period
of 30 min while stirring. The organic layer was separated,
washed with water, and dried under vacuum. The crude
product was recrystallized from an acetone¨Cbenzene
mixture to afford 1. Yield: 94%, m.p 156¨C157 C.
C19H14N2O2: Found: C, 75.6; H, 4.6; N, 9.3. Calcd: C,
75.5; H, 4.7; N, 9.3.1H-NMR (CDCl3): d=12.72 (br, s,
1H), 8.90 (d,J=8.3 Hz, 1H), 8.76 (ddd,J=4.7, 1.7,
0.8 Hz, 1H), 8.29 (br, d, J=7.8 Hz, 1H), 7.90 (td,
J=7.7, 1.6 Hz, 1H), 7.76¨C7.78 (m, 2H), 7.56¨C7.66 (m,
3H), 7.45¨C7.49 (m, 3H), 7.15 (m, 1H) ppm.

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