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72 THE MANUFACTUEE OF CHEMICALS BY ELECTKOLYSIS potassium iodide, the substitution compound dithymol- 1 diiodide (aristol) is formed. This method has also been employed for obtaining eosin and other halogen derivatives 2 of the fluorescein group. it is claimed, can be obtained. Good yields of excellent quality, CONDENSA TION BY ELECTROL YSIS. 3 Many years ago, Brown and Walker found that by electrolysis of mono-esters of dibasic acids, carbon dioxide was removed, and the residues condensed to form a dibasic ester of higher molecular weight. For example, ethyl potassium malonate reacts in the following manner, giving diethylsuccinic ester:— /COOK 2CH/ = N COOC2H6 The method has been expanded by Mulliken and Weems, 5 and also by von Miller and Hofer. The principle has been applied to the preparation of 6 aromatic compounds from the carboxylic acid copper salts. The disappearance of the blue colour of the copper salt indicates the completion of the reaction- Ethylene diamine is produced from the copper salt of glycine:— (CH2NH2COO)2Cu - C2H4(NH2)2 + 2CO2 + Cu. 1a 3 4 66 Ber.,1895, 28, 2427, 3488. D.B.P. 147943(1904). CH2-COOC2H5 I + 2CO2 + 2K. CH2 •COOC2H6 D.B.P. 64405 (1891). Ibid.108838(1899). Annalen, 1891, 261,107 ; 1893, 274, 41. Amer. Chem. Journ., 1893,15,323; 1894=,16,569. 4PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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