Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . or the Kekule view forms the closest approximation to the constitutional formulae indicate the existence of two isomericcompounds of the following types— OH CH3—C— and k CH3 HO—C—C02HI H whilst, on the vant Hoff-Le Bel view, two isomerides should existin which the four groups, H, CH3, OH, and C02H, are arranged aboutthe central carbon atom in the manner indicated in Figs. 3 and 4. Although in each case two isomerides would be obtained, theexam
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . or the Kekule view forms the closest approximation to the constitutional formulae indicate the existence of two isomericcompounds of the following types— OH CH3—C— and k CH3 HO—C—C02HI H whilst, on the vant Hoff-Le Bel view, two isomerides should existin which the four groups, H, CH3, OH, and C02H, are arranged aboutthe central carbon atom in the manner indicated in Figs. 3 and 4. Although in each case two isomerides would be obtained, theexamination of the two kinds of figure reveals very essential differ-ences. The solid figure isomerides differ only in that the one is theimage in a mirror of the other—they are related in the same kind of. way as a right- and a left-hand glove. The differences observablebetween two molecules thus related should consequently not be differ-ences of an ordinary chemical nature, but differences involvingmerely a kind of chemical, physical and mechanical right- and left-handedness. The Kekule constitutional formulae, on the other hand,would indicate—if they indicate anything—that the substances towhich they refer differ in the more gross way in which ordinary 1903.] on Recent Advances in Stereochemistry. 305 chemical isomerides differ in chemical, physical and mechanicalrespects. That carbon atom which was present in the originalmethane molecule is, in these new compounds, now attached to fourdifferent atomic groups, and such a carbon atom is termed an asym-metric carbon atom. It is in the case of substances containing anasymmetric carbon atom that a lack of agreement is observedbetween the facts and the kind of isomerism indicated by the Kekuleformulfe, and in these cases also the speci
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