Preparation of 1,2-Dimethoxy Benzene

o-Dimethoxy benzene was prepared from oanisidine by diazotization,hydrolysis and methylation.The optimal reaction conditions were as follows:n(o-anisidine)∶n(sulfuric acid)∶n(sodium nitrite)=1.0∶3.0∶1.01,n(ohydroxy methylphenate)∶n(dimethyl sulfate)=1∶1.4,the diazotization temperature was 10～15℃,the acid concentration and temperature in process of hydrolysis were 40% and 110℃ respectively;the methylation temperature was 80℃,the reaction lasted 3h and the total yield was 84.8%.The product was confirmed by IR and 1HNMR.