| http://www.w3.org/ns/prov#value | - In still another example, the reaction time is from about 2 hours to about 6 hours.Preferred solvents are selected from the group consisting of acetonitrile, chloroform, 1,2-dichloroethane, 1,1,2-trichloroethane, dichloromethane, carbon tetrachloride, and methanol.Typically, the base used in the reaction is a strong base.
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