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The circular dichroism spectra of (–)-(R)-2-(1,2,2-trimethylpropyl)pyridine, under various conditions of solvent and temperature, are reported. The results are consistent with the presence of three electronic transitions (two n→π* and one π→π* excitations) in the spectral range examined (300–230 nm).

The circular dichroism spectrum of (+)-5,6,7,8-tetrahydro-8,9,9-trimethyl-5,8-methanoquinoline, a molecule containing a pyridine chromophore perturbed by an alkyl moiety has been carried out down to 170 nm through the region of the allowed π→π* transitions.

C.d. and u.v. absorption bands of (R)-3,3-dimethyl-2-methylaminobutane in the 250–180 nm spectral region are reported and assigned to Rydberg-type transitions on the basis of c.d. data at low temperature.

The c.d. spectra of three chiral open-chain saturated ethers are described in the spectral region 140–200 nm.

Circular dichroism spectra recorded far into the vacuum u.v. region for solutions of a simple ether demonstrate that the positions of the bands depend on the extent of hydrogen bonding with the solvent.