Synthesis and chemistry of 5,6-dihydropyridinium salt adducts. Synthons for general electrophilic and nucleophilic substitution of the piperidine ring system
The reaction of the ambidentanion (2)derived from 2-cyano-3-ethyl-1-methyl-Δ3-piperideine (1) with t-butyl halides and p-NO2C6H4CH2X led to formation of the C-2 product (3)and the C-4 product (6) respectively via a probable singleelectrontransferreaction; dimerization of anion(2) gave dimmers (8)(8), (9), and (10) by electrontransfer to m-dinitrobenzene, I2, and 2-methyl-2-nitropropane.