As the first of a series of investigations on adrenochrome (the 5,6‐quinone of 3‐hydroxy‐2,3‐dihydro‐1‐methylindole), one of the red precursors of the skin pigment, derived from adrenaline, this paper deals with the preparation of this quinone, its properties and some of its derivatives. It is able to form methaemoglobin from haemoglobin and to convert haemochromogen into verdohaemochromogen, the intermediate compound in the haemoglobin breakdown to the bile pigments.
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W. L. C. Veer (1942) studied this question.
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