LIGHT ABSORPTION STUDIES: PART XXI. THE ULTRAVIOLET AND INFRARED ABSORPTION OFo-ALKYL- ANDo,o′-DIALKYL-SUBSTITUTED ANISOLES

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Abstract
Steric effects, previously reported by other workers in o- and o,o′-alkyl-substituted anisoles, were reinvestigated using compounds carefully purified by vapor phase chromatography. The ultraviolet spectral data indicate that the o-alkyl-substituted anisoles exist in one conformation, whereas the investigated o,o′-dialkyl-substituted anisoles exist in a different conformation. The conformations appear to be almost independent of the size of the substituent groups. Infrared, dipole moment, and other data are consistent with this interpretation.