Keiichi Tsuji

A new furoxan derivative and its precursors formed by the reaction of sorbic acid with sodium nitrite

Abstract A new furoxan derivative ( 3 ) and its precursors ( 4a and 4b ) were isolated from the reaction mixture of sorbic acid with sodium nitrite, and their structures were determined by spectroscopic and X-ray crystallographic analysis.

Redox reaction of tri(2-deoxy-2-L-ascorbyl)amine. Formation of a persisting free radical species in water

Abstract Electrochemical studies showed that tri(2-deoxy-2- L -ascorbyl)amine ( 1 ), a new compound isolated as one of the products of reaction of dehydro- L -ascorbic acid with phenylalanine (with added L -ascorbic acid) in ethanol, is oxidized in aqueous solution in two reversible one-electron transfer steps, on mercury or platinum electrode. The first step occurs through the dianion, and its product is an unusually stable blue anion radical giving a characteristic ESR signal. The product of the second step of oxidation is labile and is slowly converted into the oxidized form of di(2-deoxy-2- L -ascorbyl)amine, presumably by hydrolysis with splitting of L -ascorbic acid.