Halotosyloxylation reaction of alkynes with iodine or NBS or NCS was efficiently promoted by the poly{[4-(hydroxyl)(tosoyloxyl)iodo]styrene}.
Halotosyloxylatio
9-Pyridyl-1,8-dioxo-2,3,4,5,6,7-hexahydroxanthene 3 (C18H17NO3) was prepared by the reaction of 4-pyridinecarboxaldehyde and 1,3-cyclohexanedione using Nafion-H