491-39-4
thiochromen-4-one
→
~88%
22810-27-1
1,1-dioxothiochromen-4-one
~62%
37682-92-1
4H-1-Benzothiopyran-4-one 1-oxide
+
27720-87-2
3-bromo-1,1-dioxo-2,3-dihydrothiochromen-4-one
~49%