Methods of Quantitative Organic Analysis
Methods of Quantitative Organic Analysis
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Acetylation by acetic anhydride in the cold is a slow pro- cess, but it may be considerably hastened by the addition of pyridine and warming on the water bath for a short time.
E . OH + (CH 3 CO) 2 + Pyridine = E . . CO . CH 3 + CH 3 . COOH : Pyridine.
Since the acetic acid formed is at once taken up by the pyridine it can exert no hydrolyzing influence on the acetyl compound. The amount of acetic acid thus taken up is determined by titration with alkali, which decomposes the pyridine salt form...ing sodium acetate. The details for quan- titative work are as follows : A mixture of 120 gms. Acetic anhydride and 880 gms. Of pyridine is used for acetylation. Twenty-five c. C. Are equivalent to 60 c. C. N. Alkali.
1 to 2 gms. Of the hydroxy compound are weighed into a 200 c. C. Flask, 25 c. C. Of the pyridine solution added, and the flask heated on a water bath for a quarter of an hour. A con- denser is unnecessary as direct experiment has shown that no anhydride is lost by evaporation. The mixture is cooled, 25 c.
What to read after Methods of Quantitative Organic Analysis?
You can find similar books in the "Read Also" column, or choose other free books by P C R Kingscott to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Acetylation by acetic anhydride in the cold is a slow pro- cess, but it may be considerably hastened by the addition of pyridine and warming on the water bath for a short time.
E . OH + (CH 3 CO) 2 + Pyridine = E . . CO . CH 3 + CH 3 . COOH : Pyridine.
Since the acetic acid formed is at once taken up by the pyridine it can exert no hydrolyzing influence on the acetyl compound. The amount of acetic acid thus taken up is determined by titration with alkali, which decomposes the pyridine salt form...ing sodium acetate. The details for quan- titative work are as follows : A mixture of 120 gms. Acetic anhydride and 880 gms. Of pyridine is used for acetylation. Twenty-five c. C. Are equivalent to 60 c. C. N. Alkali.
1 to 2 gms. Of the hydroxy compound are weighed into a 200 c. C. Flask, 25 c. C. Of the pyridine solution added, and the flask heated on a water bath for a quarter of an hour. A con- denser is unnecessary as direct experiment has shown that no anhydride is lost by evaporation. The mixture is cooled, 25 c.
What to read after Methods of Quantitative Organic Analysis?
You can find similar books in the "Read Also" column, or choose other free books by P C R Kingscott to read onlineMoreLess
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