| http://www.w3.org/ns/prov#value | - The reaction takes place in the presence of a secondary amine and preferably in a suitable solvent which may include aliphatic and aromatic hydrocarbons such as petroleum ether, benzene, toluene, xylene, hexane or cyclohexane; halogenated aliphatic and aromatic hydrocarbons such as carbon tetrachloride, methylene chloride, chloroform, chloro- and dichlorobenzene; ethers such as diethyl ether, tetr
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