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Reaction Of Keto Isomer Indoxyl With O2, Forming Indigo.

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What type of reaction occurs when the keto isomer of indoxyl reacts with O2 to form Indigo?


Addition, Substitution, Oxidation, or Reduction?


Aren't the hydrogens being removed from indoxyl, forming H2O and making this an Oxidation reaction?



Looks to me (having googled it) that indeed one loses 4 H atoms, for each pair of indoxyl units, to make one indigo molecule.  

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