Some 4(1h) Pyridylidene Compounds II Synthesis and Structure of N,N‐Conjugated‐4‐Pyridine Compounds

The reaction of 4‐methylpyridine and its methiodide with p‐N, N‐dimethylamino‐benzaldehyde gave 4‐p‐N, N‐dimethylaminostyrylpyridine (I) and 4‐p‐N, N‐dimethylaminostyrylpyridine methiodide (II), respectively, II was also prepared by methylation of I with methyl iodide in methanol. The pyridylidene structure of II, N‐benzyl‐4‐(p‐N, N‐dimethylaminophenyl) pyridinium chloride (IVa) and its methiodide (Va) was discussed in terms of UV, NMR and mass spectra.