prov:value
| - xane and paraformaldehyde, are also known.As diluents for the reaction according to the invention, all inert organic solvents are suitable, especially hydrocarbons such as petroleum ether, ligroin and toluene, halogenated hydrocarbons such as chlorobenzene, 1,2-dichlorobenzene,1,2-dichloroethane, methylene chloride and chloroform, nitrated hydrocarbons such as nitrobenzene and nitromethane, and et
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