Category: Science - Chemistry/Biochemistry
1. Tannin 2. Digallic Acid 3. Ellagic Acid 4. Depsides Carbomethoxylation of Hydroxybenzoic Acids Chlorides of Carbomethoxyhydroxybenzoic Acids Preparation of Didepsides Preparation of Tridepsides Preparation of Tetradepsides Tannoid Substances of the Tannin Type Chart showing...
The first investigations of gall-tannin date from the year 1770, at which time, however, no exact differentiation between tannin and gallic acid was made. The first step in this...
5. part 30 per cent. HCHO solution plus 3 parts of water) in the cold, withcontinuous stirring, the solution remains clear and assumes a brown colour. When left several hours, a light, white flocculent precipitate deposits, which increases in quantity...
4. PART IIWith regard to their _industrial production_, but few synthetic tannins are, to-day, of practical and commercial interest. In addition to simplicity in the method of manufacture...
2. PART IIA. Condensation of Free Phenolsulphonic Acid B. Condensation of Partly Neutralised Phenolsulphonic Acid C. Condensation of Completely Neutralised Phenolsulphonic Acid D. Condens...
1. PART I1. Tannin 2. Digallic Acid 3. Ellagic Acid 4. Depsides Carbomethoxylation of Hydroxybenzoic Acids Chlorides of Carbomethoxyhydroxybenzoic Acids Preparation of Didepsides Prepara...