1-Benzyl-2-methyl-4,5-dihydrpimidazole has been lithiated and C-acylated by reaction with esters and a nitrile. The products do not exist as 2-(2-oxoalkyl)dihydroimidazoles but as the alternative tautomers, as indicated by spectroscopic and crystallographic data.
M. W. Anderson, M. J. Begley, R. C. F. Jones and J. Saunders, J. Chem. Soc., Perkin Trans. 1, 1984, 2599 DOI: 10.1039/P19840002599
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