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Excerpt from American Chemical Journal, Vol. 39: January-June, 1908
This practically forgotten conception was revived some years ago, and attention was called to its extreme importance in explaining chemical changes.2 According to the writer, the Kekule double molecule is formed by the attraction of the free energy in two or more unlike molecules, and its formation proceeds with the conversion of more or less of the free energy into bound energy and heat, its stability being determined in this way. Such double molecules are represented by compounds with water of crystallization or by the numerous addition products of saturated organic substances with halhydric acids and halogens.3 The second stage in chemical action may occur in one of three ways: (a) bya double molecule passing over, with further conversion of the free into bound energy, into a much more stable ordinary molecule, a process represented by an addition reaction; (b) by a homogeneous; and (c) by a hetero geneous double decomposition.'
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