Extract from "Preparation of Organic Intermediates" (Shirley, 1951)
CO(CH2COOH)2 + 2 HNO2 -> CO(CH=NOH)2 + 2 CO2 + 2 H2O
Koessler and Hanke, J. Am. Chem. Soc., 40, 1717 (1918)'; Pechmann and Wehs- arg, Bet., 19, 2465 (1886).
A solution of 50 g. of acetonedicarboxylic acid (crude, containing some sulfuric acid) [Org. Syntheses Coll. Vol. 1, 11 (1941)] in 100 ml. of water is
stirred and cooled in an ice bath while a concentrated aqueous solution of 30 g. (0.44 mole) of sodium nitrite is added drop-wise. The resulting
mixture is acidified by the slow addition of
dilute sulfuric acid with continued cooling and stirring. The precipitated diisonitrosoacetone is collected by filtration and washed with water. The
yield is about 50%. The product may be further purified by recrystallization from methanol. The pure product melts at 143-144 ° .
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