SYNTHESIS OF PYRUVIC ACID
- Grind together in a glass mortar 200g (1.33 mol) of
powdered tartaric acid and 300g (2.2mol) of freshly fused potassium hydrogen
sulphate to form an intimate mixture.
- Place the mixture in a 1.5-litre
round-bottomed flask, and fit the latter with a still-head and a long air
condenser.
- Heat the flask in an oil bath maintained at 210-220 °C until liquid
no longer distils over.
- If foaming is considerable and there is danger of the
mixture frothing over, heat the upper part of the flask with a free flame.
- Fractionate the distillate under reduced pressure and collect the pyruvic acid
at 75-80 °C/25mmHg. The yield is 60 g (51%).
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