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64 THE MANTJFACTUEE OF CHEMICALS BY ELECTBOLYSIS Acetanilide and its homologues undergo intra-molecular rearrangement when reduced, and the corresponding x amines are formed :— / CtfH5. NHCOCH3 -> CfiH4< N 2 CH2. CH3 In the reduction of pyridine and quinoline compounds, 2 hydrogenation generally occurs. An interesting application of electrolytic reduction to vat-dyeing is the process of the Farbwerke vorm. Meister Lucius and Briming, in which alkali sulphite is electro- lytically reduced in the presence of indigo. In an acid 3 4 ^-Rosaniline can be obtained by the electrolytic reduc- tion of p-nitrodiaminotriphenylmethane. When nitro-group and keto-group are both present in the compound to be reduced, the former is preferably 5 solution, indigo white is precipitated. attacked so that azo-, azoxy-, or amino-keto compounds result. *Ber., 1899,32,68. 2 D.R.P . 104:664 (1898); Zeitsch. Elekfrochem., 1898, 2, 580. "D.B.P., 139567 (1902). 'Ibid. 84607(1894). B Elbs and Wogrinz, Zeitsch. EleJctrochem., 1903, 9, 428.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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