Nitric Acid → 2,5-Cyclohexadiene-1,4-dione, 2,3,5-trimethyl-

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Reaction Steps

1000 g of carbon tetrachloride was charged in a 5-liter four neck flask equipped with a stirrer, a condenser, a chlorine-bubbling pipe and a thermometer, and 408 g (3 moles) of 2,3,6-trimethylphenol was dissolved therein. Thereafter, 210 g (3 moles) of chlorine gas was bubbled thereinto at 40°C in 2 hours. After the completion of the bubbling, a mixture of 210 g of a commercially available nitric acid (63 percent by weight) and 600 g of water was immediately added dropwise thereto at 40°C for 2 hours. After the completion of the dropwise addition, the stirring was continued for further 1 hour. Then, the reaction solution was allowed to stand, and the separated lower layer of carbon tetrachloride was taken out, and washed with water, followed by distilling off carbon tetrachloride. Thus, 460 g of the residue was obtained as a red oil, in which 405 g of 2,3,6-trimethyl-p-benzoquinone was included. (90 percent in yield).

Provenance & Evidence