4-Ethyl- and isopropylpyridine reacted with LDA and TMEDA to give title compds. I (R = H, Me), which were subjected to x-ray anal. The structural parameters of the heterocyclic moieties of I are typical of N-lithiated 4-alkylidene-1,4-dihydropyridines. MNDO geometries compare quite well with x-ray structure of I (R = H). The lithium atom of I (R = H) in soln. prefers the same type of coordination as in the crystal. Two-dimensional 6Li,1H-HOESY showed Li contacts only to ortho-hydrogen atoms. I (R = H) reacts exclusively as a C nucleophile, whereas I (R = Me) reacts exclusively as a N nucleophile.