Abstract
About twenty years ago the outlook on theoretical problems connected with tautomerism was considerably enlarged by the proposal to regard tautomeric changes, for certain purposes, as internal analogues of additivereactions1; thus the study of ring-chain tautomerism developed as a direct consequence of this point of view. It is curious that the complementary and equally valid idea of regarding tautomeric change as an internal form of elimination seems never to have been explored. Consideration shows that it leads to many striking analogies and correlations. This note is confined to a single illustration chosen because it happens to be simply explicable in terms of the preceding communication,
Published Version
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