The reaction of Grignard reagents with 1,2-di-isocyanoarene results in the formation of quinoxaline oligomers up to a hexa-oligomer, which may be derived from successive insertion of the two ortho isocyano groups of 1,2-di-isocyanoarene into the carbon–magnesium bond.
Y. Ito, E. Ihara, M. Hirai, H. Ohsaki, A. Ohnishi and M. Murakami, J. Chem. Soc., Chem. Commun., 1990, 403 DOI: 10.1039/C39900000403
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