Abstract
ORD and CD measurements in the UV spectra region are reported for a series of compounds possessing the α-arylethyl structure. The compounds examined are S-(+)-2-( p-tolyl)butane, S-(+)-2-methyl-6-( p-tolyl)heptane, R-(−)-2-( p-anisyl)propionic acid, S-(+)-3-( p-anisyl)butanoic acid, S-(+)-3-( p-tolyl)butanoic acid, S-(+)-3-( p-carboxyphenyl)butanoic acid, S-(+)-4-( p-tolyl)pentanoic acid, S-(+)-4-( p-tolyl)pentanol-1, and S-(+)-2-methyl-6-( p-tolyl)heptanone-4-. Two positive Cotton effects, due to the 1L a and 1L b transitions of the aromatic ring are observed. Carboxyl and hydroxyl functions separated from the chiral center by at least one methylene group do not affect the sign of either aromatic Cotton band. In contrast, a carboxyl group attached directly to the chiral center results in aromatic Cotton effects of negative sign.
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