1-Lithio-2-n-butyl-1,2-dihydropyridine (V) prepared from pyridine and n-butyl-lithium in the presence or absence of TMEDA, reacts with benzophenone to give a number of products: (I), (II), (III), and of particular interest, the reduction product, (IV).
R. Levine and W. M. Kadunce, J. Chem. Soc. D, 1970, 921 DOI: 10.1039/C29700000921
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