Oxygen → 2,5-Cyclohexadiene-1,4-dione, 2,3,5-trimethyl-

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Reaction Steps

3.96 g of cobalt di-(salcylal)-3,3'-diimino -di-n-propylamine (0.1 mole) and 1.01 g of triethylamine (0.01 mole) were dissolved in 100 ml of chloroform and oxygen gas (100 ml/min) was then bubbled into the resulting solution for 5 seconds at a temperature of 10°C to form an oxygen complex. To this was added a solution of 13.6 g of 2,3,5-trimethylphenol (0.1 mole) in 100 ml of chloroform in three portions and oxygen gas (250 ml/min) was again introduced into the solution for a period of 8 hours to complete the reaction. After completion of the reaction, chloroform was distilled off and the residue was steam distilled by introducing steam thereinto. The distillate was extracted with ether and the ether was then distilled off to give 15.0 g of pseudocumoquinone (0.1 mole) having a melting point of 32°C, that is, the yield was quantitative.

Provenance & Evidence