prov:value
| - er cooling to heating, wherein it is preferable to carry out it under cooling.As to the solvent to be used in the reaction, no solvent may be used or a solvent inert to the reaction may be used, including aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene and the like, ethers such as diethyl ether,tetrahydrofuran, dimethoxyethane (DME) and the like, halogenated hydrocarbons such as
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