Abstract
The interaction of the L-cysteine solution with iron(III) compounds of FeCl3, Fe2(SO4)3, Fe(NO3)3 was studied in an acidic medium (pH 2). It was shown that the reaction proceeded 30 minutes with the formation of L-cystine (21–40%) as the main product. It was found that the L-cysteine reaction with FeCl3 leads to the formation of the L-cysteine sulfinic acid in the solution as a by-product. The products of the L-cysteine reaction
 with Fe(III) compounds were interpreted by IR and NMR spectroscopy.
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