As. Kulikov et al., REDUCTION OF THE FUROXAN RING TO THE FURAZAN RING IN SOME CARBONYL-SUBSTITUTED FUROXANS, Russian chemical bulletin, 43(4), 1994, pp. 630-631
It was shown that the furoxan ring is efficiently reduced to the furaz
an ring in carbonyl-substituted furoxans with other functional groups
by the action of the SnCl2-HCl-AcOH system.