Theoretical organic chemistry / by Julius B. Cohen.

  • Julius B. Cohen
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Theoretical organic chemistry / by Julius B. Cohen. Source: Wellcome Collection.

    66/604 (page 46)
    CLASSIFICATION Classification.—Having ascertained the molecular formula of a substance from its analysis and molecular weight, some¬ thing may be learned about its structure from its relation to other compounds of known constitution. It is therefore desir¬ able to adopt a system of classification which will bring into prominence this relationship. The simplest and most natural method is to group together all those compounds which contain the same elements and which possess at the same time the same chemical properties, i.e. which behave in the same manner towards reagents. Reagents employed in Organic Chemistry.—The following are the most important reagents used in organic chemistry :—• Oxidising Agents. — (i) Nitric acid (dilute and strong)— 2PINO3 = 2NO + h2o + 3O. (2) Potassium permanganate in acid or alkaline solution— 2KMn04 + 3H2SO4 = K2S04 + 2MnS04 + 3H0O + 5O. 2KMn04 + HoO = 2KOH+ 2Mn02 + 3O. (3) Potassium dichromate and sulphuric acid— K2Cr207 + 4H.2S04 — K2S04 + Cr2(S04)3 + 4H20 + 3O. (4) Chromium trioxide and glacial acetic acid—- 2Cr03 + 6C2H402 = Cr2(C2H302)6 + 3H20 + 3O. The use of a reagent in an organic solvent, like acetic acid, is of advantage on account of the solubility of organic substances in such solvents.