Author Description

Excerpt from American Chemical Journal, 1889, Vol. 11 Hantzsch and Herrmann have, in a series of papers,2 assumed the chemical difference of the various modifications of ethyl p-dihydroxy-terephthalate; they assert that all para-dihydroxy or all benzene derivatives must be colorless, while ketones or quinones must be colored. The question of color is purely arbitrary and does not prove anything whatever. Heretofore more has been considered necessary in order to settle the constitution of a chemical compound. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.