The Fundamental Processes of Dye Chemistry
The Fundamental Processes of Dye Chemistry
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The hydrochloride of isatin- anilide separates out, mixed with finely divided sulphur, as a light reddish-brown precipitate.
To obtain the anilide in a pure form it is filtered off and thoroughly washed with 20 % salt solution. The hydrochloride freed from all acid is then stirred up with water and dilute sodium carbonate solution MISCELLANEOUS DYES 165 until there is a faintly alkaline reaction. The precipitate of anilide and sulphur is filtered off, thoroughly washed, and the dried mixture ex...tracted with cold carbon bisulphide. Finally, the anilide is crystallized from hot alcohol, from which it is obtained in the form of dark needles having a melting point of 126, the yield from 200 gms. Thioamide being about 150 gms. Pure substance. On boiling with a slight excess of dilute hydrochloric acid, the anilido group is split off as aniline, pure isatin being precipitated directly. M. P. 200-201. It is recrystallized from hot water in which it is easily soluble. Isatin is an important intermediate for the synthesis of various valuable vat-colours.
What to read after The Fundamental Processes of Dye Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by H E Hans Eduard Fierz David to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The hydrochloride of isatin- anilide separates out, mixed with finely divided sulphur, as a light reddish-brown precipitate.
To obtain the anilide in a pure form it is filtered off and thoroughly washed with 20 % salt solution. The hydrochloride freed from all acid is then stirred up with water and dilute sodium carbonate solution MISCELLANEOUS DYES 165 until there is a faintly alkaline reaction. The precipitate of anilide and sulphur is filtered off, thoroughly washed, and the dried mixture ex...tracted with cold carbon bisulphide. Finally, the anilide is crystallized from hot alcohol, from which it is obtained in the form of dark needles having a melting point of 126, the yield from 200 gms. Thioamide being about 150 gms. Pure substance. On boiling with a slight excess of dilute hydrochloric acid, the anilido group is split off as aniline, pure isatin being precipitated directly. M. P. 200-201. It is recrystallized from hot water in which it is easily soluble. Isatin is an important intermediate for the synthesis of various valuable vat-colours.
What to read after The Fundamental Processes of Dye Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by H E Hans Eduard Fierz David to read onlineMoreLess
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