Melting points were determined with a Thomas-Hoover capillary apparatus and are uncorrected. Ultraviolet spectra were recorded on a Beckman DK-2 spectrophotometer and evaporations were performed under diminished pressure at 40°with a Rotoevaporator unless otherwise stated. The MCD spectra were determined on the Cary Model 60 with MCD attachment. (30) U. S. Patent 3,121.092; Chem. Abstr., 60, 2030 (1964). (31) Baker silica gel, chromatographic quality, deactivated with 10% HzO and containing 0.5% by weight Du Pont 609 Phosphor: B Leov and M. Goodman, Chem. Ind. (London), 2026 (1967). (32) The synthesis of 10 has been reported (J. Zemlicka, Abstracts, 4th International Congress on Heterocyclic Chemistry, Salt Lake City, Utah, July 9-13, 1973, p 15) as the major product using different reaction conditions.
Umsetzung der Pyridinium‐Verbindungen (Ia), (Ib) und (IV) mit Natrium= Cyanid in Aceton/Wasser führt zu den Dihydrobipyridylen (IIa), (IIb)′und (V) in 95, 80 und 51%iger Ausbeute.
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