2. In the preparation of m-nitrobenzaldehyde dimetylacetal^1: structure 1,the pr

Question

2. In the preparation of m-nitrobenzaldehyde dimetylacetal^1: structure 1,the product and sodium chloride are obtained as a mixture after the reaction has been run. The separation of these two is described as follows: (1) The residue is treated with cool water, and the aqueous solution is extracted with two 50 ml portions of ether. The ether solution is treated briefly with anhydrous magnesium sulfate, and then for twelve hours with anhydrous sodium carbonate. Alter the ether has NO2 been removed by distillation under reduced pressure from a steam bath, the residue is distilled under reduced pressure to give the product bp 141-143 degree C/8mm. a. Which compound is found in the ether layer? b. Why is a second 50 mL portion of ether used? c. What is the purpose of treating with magnesium sulfate? With sodium carbonate? c. What does 8mm mean and why was that condition used?

Explanation / Answer

a. Ether is used to extract the organic compound m-nitrobenzaldehyde dimethylacetal.

b. Second 50 mL ether is used to extract traces of m-nitrobenzaldehyde dimethylacetal present in the aqueous extract.

c.Magnesium Sulfate as well as Sodium Carbonate are hygroscopic materials. These are used to absorb traces of water from ether layer.

d. 8 mm mean the boiling takes place at a reduced pressure of 8 mm of Hg. This reduced pressure is used to lower the boiling point such that oxidation or other recations at higher temperature does not take place.

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