Li. Belenkii et al., A NEW REDOX SYSTEM - TRICHLOROMETHYLARENE-PYRIDINE BASE - ON THE MECHANISM OF THE SYNTHESIS OF N-(4-PYRIDYL)PYRIDINIUM DICHLORIDE, Tetrahedron letters, 36(28), 1995, pp. 5075-5078
A redox reaction of trichloromethylarenes with pyridines results in re
spective N-(alpha-chloroarylmethyl)-substituted pyridinium chlorides w
hich give on hydrolysis aromatic aldehydes and 4-chloropyridines or 1,
4'-bipyridinium salts.