| http://www.w3.org/ns/prov#value | - As to the solvent used in this cyclization, alcohols such as methanol, ethanol and isopropanol; aromatic hydrocarbons such as benzene, toluene and xylene; halogenated hydrocarbons such as dichloromethane, dichloroethane, chloroform and carbon tetrachloride; ethers such as diethyl ether, tetrahydrofuran, dioxane, diglyme and monoglyme; aprotic polar solvents such as dimethylformamide, dimethyl sulf
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