Suggested Reaction 1.3.4.-

Left

3,4,6-Trichlorocatechol
+1,4-Dithiothreitol

Right

3,4,6-Trichloro-cis-1,2-dihydroxycyclohexa-3,5-diene
+Oxidized dithiothreitol

[BiSSCat | GREP ]