Hydrogen peroxide reactions with sulfur compounds

Dimethyl pyridine 6 was treated with hydrogen peroxide and 3,5-dimethyl pyridine-N-oxide 7 was produced. Compound 7 was nitrated with a mixture of nitric and sulfuric acids to give 3,5-dimethyl-4-nitropyr-idine-N-oxide 8. Compound 8 was converted to 3,5-dimethyl-4-methox-ypyridine-N-oxide 9 by reaction with methanol. Compound 9 was treated with a mixture of methanol and ammonium dithionite to give 3,5-dimethyl-... 

The reaction has also been realized in the gas phase with sulfur being generated by mixing sulfur dioxide with hydrogen sulfide.27,28 This method seems to be very efficient for the preparation of aromatic and aliphatic compounds as well as the unsubstituted l,2-dithiole-3-thione. More complex l,2-dithiole-3-thiones such as 17 have also been prepared.28 4-Neopentyl-5-t-butyl-l,2-dithiole-3-thione has been prepared from triisobutylene and sulfur.29 1-Phenyl-1-propene does not give a simple thione in the reaction with sulfur, but thiol 18. The yield was raised by the presence of hydrogen sulfide and benzoyl peroxide.30... 

---