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Methyl 2-bromobenzoate under Heck reaction with acrylonitrile results in lactonization to give the benzofuran-2-one 3-(cyanomethyl)-2-coumaranone. It is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals
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Heck reaction with acrylonitrile results in lactonization to give the benzofuran-2-one 3-(cyanomethyl)-2-coumaranone: J. Heterocycl. Chem., 32, 1587 (1995):