Arylmagnesium bromides react with N-substituted maleimides to yield N-substituted-5-aryl-5-hydroxy-2-pyrrolinones and not the corresponding open chain β-aroylacrylamides. The structural assignments are based on ultraviolet, infrared, and nuclear magnetic resonance spectra.
A. Queen and A. Reipas, J. Chem. Soc. C, 1967, 245 DOI: 10.1039/J39670000245
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