Dehydration of 2,3-butanediol in the liquid phase with 3 to 20% of sulphuric acid gave water, butanone-2, and the cyclic methyl ethyl ketal of 2,3-butanediol as the chief products, the total yield of liquid products being about 96%. The reaction can be run as a continuous process, and by using conditions that favour removal of the cyclic ketal from the reaction mixture it may make up 75% of the weight of the total liquid products. The rate of dehydration of 2,3-butanediol varied as the square of the 2,3-butanediol concentration and increased logarithmically with increase in the concentration of sulphuric acid.
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Neish et al. (1945) studied this question.
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