N-quaternary compounds—XLIV: Synthesis and circular dichroism of α-N,N-dimethylamino and α-N,N,N-trimethylammonio ketones

CD spectra of acyclic α-N,N-dimethylamino ketones exhibit two absorption bands of opposite sign at ca. 240 and 305–315 nm. Both bands are ascribed to the same conformers. On protonation only one CD band is seen. The single CD band of α-N,N,N-trimethylammonio ketones has the same sign and almost the same wavelength maximum as the protonated amino ketones.