Abstract: The intermolecular and intramolecular reductive coupling reactions of _,- unsaturated nitrile derivatives induced by a low-valent titanium reagent prepared from titanium tetrachloride and zinc powder were studied. The configuration of cyclodimerization product was confirmed by X-ray analysis. Key words: cyclopentenes, reductive cyclization, 2- aminoquinolines, low-valent titanium, _,-unsaturated nitriles