Various N-arylpyrazoles can be prepared by a condensation reaction fro
m pyrazoles and activated aryl ethers as 2,4-dinitrophenyl phenyl ethe
r and 2,4,6-trini-trophenyl-phenyl ether in DMSO as solvent at 155-165
degrees for 1-3 hours. The basicity of pyrazoles and the reactivity o
f activated aryl ethers are important factors in this reactions.