Synthesis of linearly bonded 1,1’ -bis[4-(1,3-diselenan-2-yl)pyrazoles] from 1,1’ -bis(pyrazole-4-carbaldehydes) and propane-1,3-diselenol

The reaction of linearly bonded 1,1’-bis(pyrazole-4-carbaldehydes) with propane-1,3-diselenol at room temperature in the presence of Me₃SiCl followed by treatment with triethylamine affords the corresponding 1,1’-bis[4-(1,3-diselenan-2-yl)pyrazoles].