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3. When compound 11 is treated with two equivalents of methansulfonic acid (MSOH) in dichloromethane, the pyrazole 12 and hydrazine 13 are obtained (after

3. When compound 11 is treated with two equivalents of methansulfonic acid (MSOH) in dichloromethane, the pyrazole 12 and hydrazine 13 are obtained (after the reaction mixture has been neutralized): COME OMe OMe H MSOH 2 EtO CH2Cl, EtO H' H. H 11 12 13 "OEt Propose a reasonable mechanism!

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