Quinoxaline N-oxides
It is found that 2,3-dimethylquinoxaline-l, 4-di-N-oxide reacts with formaldehyde only in the presence of alkaline reagents, and that independent of the amount of formaldehyde taken, 2-(β-hydroxyethyl)-3-methyl- and 2, 3-bis (β -hydroxyethyl) quinoxaline-di-N-oxides are formed. Oxidation of quinoxaline derivatives of general formula VI gives the corresponding mono- and di-N-oxides.