The Preparation of Organic Compounds
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C. Of concentrated sulphuric acid. The whole is cooled to o by the addition of ice, and then 15 grm. Of potassium or sodium bichromate dissolved in 200 c. C. Of water slowly added. The mixture must be well stirred, and any rise in temperature prevented by adding more ice from time to time. The quinone separates in the pure state and only requires to be carefully washed. Red needles melting with decomposition at 115-! 20.
PREPARATION OF /3-NAPHTHOQUINONE-4-SULPHONIC ACID. Twenty grammes of a-ami...no-/3-naphthol-4-sulphonic acid are ground up with 30 c. C. Of 23 per cent, nitric acid. When the reaction is over, hot water is added until solution takes place. Some insoluble impurities are removed by nitration, and the resulting filtrate then treated with potas- sium chloride until no more precipitation takes place. The potassium salt of the quinone sulphonic acid is then filtered off, washed with cold water, and recrystallised from alcohol. Yield 84 per cent.
PREPARATION OF . -BENZOQUINONE-CHLORIMIDE (Cl : N .
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You can find similar books in the "Read Also" column, or choose other free books by E De Barry Barnett to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
C. Of concentrated sulphuric acid. The whole is cooled to o by the addition of ice, and then 15 grm. Of potassium or sodium bichromate dissolved in 200 c. C. Of water slowly added. The mixture must be well stirred, and any rise in temperature prevented by adding more ice from time to time. The quinone separates in the pure state and only requires to be carefully washed. Red needles melting with decomposition at 115-! 20.
PREPARATION OF /3-NAPHTHOQUINONE-4-SULPHONIC ACID. Twenty grammes of a-ami...no-/3-naphthol-4-sulphonic acid are ground up with 30 c. C. Of 23 per cent, nitric acid. When the reaction is over, hot water is added until solution takes place. Some insoluble impurities are removed by nitration, and the resulting filtrate then treated with potas- sium chloride until no more precipitation takes place. The potassium salt of the quinone sulphonic acid is then filtered off, washed with cold water, and recrystallised from alcohol. Yield 84 per cent.
PREPARATION OF . -BENZOQUINONE-CHLORIMIDE (Cl : N .
What to read after The Preparation of Organic Compounds?
You can find similar books in the "Read Also" column, or choose other free books by E De Barry Barnett to read onlineMoreLess
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