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The double-isonitrile insertion into the Ti-C bond is favored over double insertion into the Ti-N bond of the azatitanacyclobutene because of the precedent for the former related to three-component coupling. In addition, three-component coupling products are often observed as minor products in the reactions of Table 1. However, double insertion into the Ti-N bond could lead to the same observed products. Single insertion into both sides of the azatitanacyclobutene would generate a formyl and amidinate at the two ends of the product; to generate thepyrrole, C-C bond formation would be required from these two groups, which seems unlikely
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