Chromatographic retention and structure roofing tile effect of isomers and its fine structure

Logarithmic plots of gas chromatographic retention data for different classes of compds. on different pairs of stationary phases were constructed. A remarkable effect was found. Isomers are spread along parallel lines in a repeated pattern, forming a \"roofing-tile\" series. The scattering of points around isomer lines is real and is a consequence of detailed structure of mols. Alkanes have been divided into groups that have equal nos. of primary, secondary, tertiary, and quaternary C atoms. Alkanes of these groups lie upon straight lines. Lines of all groups are parallel. Code nos. are in numerical order if attached to the position of the lines. [on SciFinder (R)