The bifunctional bis pyrazolines and bis isoxazolines have been prepared from 1-aroyl-2-styrylsulfonylethenes and 1-arylsulfonyl-2-styrylsulfonylethenes.
Novel 2-pyrazolines were obtained by the cycloaddition of diazomethane to bis(arylsulfonylethenyl)-sulfones (3) and 1-arylsulfonyl-2-styrylsulfonylethenes (7). Dehydrogenation of 2-pyrazolines with chloranil gave pyrazoles.