Note 13 — VOLUME VI slice I Châtelet to Chicago (continued 5)
Reading edition
It is now established that ortho compounds do exist in isomeric forms, instances being provided by chlor-, brom-, and amino-toluene, chlorphenol, and chloraniline; but arguments, e.g. E. Knoevenagel’s theory of “motoisomerism,” have been brought forward to cause these facts to support Kekulé.