Three reductones, 2, 3-dihydroxy-4, 4-diphenyl-2, 5-cyclohexadien-l-one (11), 3, 4- dihydroxycoumarin (35), and 3, 4-dihydroxyspiro [5.5] undecan-3-en-4-one (641, were prepared and subsequently reacted with superoxide anion radical (02'-), generated from KO2 and 18-crown-6 polyether. The reactions were carried out in aprotic media and quenched with methyl iodide which facilitates the trapping of the various oxyanions ...
![3,4-Dihydroxy-2-oxo-2H[1]benzopyran Structure](https://image.chemsrc.com/caspic/179/77889-64-6.png)
