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Naphthalenediols, 1- and 2-naphthols, and phenols in the presence of nano ZnO as catalyst and water as green solvent react with methylenemalononitrile, generated in situ from aldehyde and malononitrile, to yield 2-amino-4 H -chromenes.
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Hosseini‐Sarvari et al. (2011) studied this question.
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