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Typical Experimental Procedure, Compound 3a: A mixture of homophthalic acid (1 g, 5.5 mmol) and acid chloride (22 mmol) was placed in a 25 mL conical flask. Microwave irradiation (MW domestic type oven 900 W with a frequency 2450 MHz, Dawlance, Pakistan) was applied for 90 seconds (three pulses each of 30s, The completion of reaction was monitored by the TLC analysis. The solvent system for TLC was hexane and ethyl acetate (7:3, The product was purified by column chromatography using hexane as eluent and recrytallized by methanol containing traces of water. A representative set of physical and spectroscopic data of prepared compounds is given below. Phenyi-1M-isocoumarin 3a: Yield: 92, m.p, 80 °C; IR (ν max, KBr, cm-, 1734, 1614, 1550, 3018; 1H-NMR (400 MHz, CDC13, δ 6.94 (1H, s, H-4, 7.26 (1H, d, J, 7.53 Hz, H-5, 7.59 (1H, t, J= 7.38 Hz, H-6),7.84 (1H, t, J= 7.63 Hz, H-7),8.3 1H
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2: C,81.07%, H,4.54% found:C,81.1 1%; H,4.54%
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