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Microwave-ready heterocycles: Cobalt-catalyzed [2+2+2] cyclotrimerization of nitrile derivatives with diynes anchored to a solid support under microwave irradiation provides a universal approach to pyridine, pyridone, and iminopyridine products. The reaction is completely chemo- and regioselective, and the products are obtained in excellent yield and high purity.
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Young et al. (2007) studied this question.
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