| http://www.w3.org/ns/prov#value | - following diagram: ##STR12##Inert solvents for the purpose of the invention are solvents which are unchanged or are only inconsiderably changed under the chosen reaction conditions.Examples of inert solvents suitable for the process (II)+(III).fwdarw.(I) are ethers such as, for example, diethyl ether, glycol monomethyl or dimethyl ether, dioxane or tetrahydrofuran, or hydrocarbons such as benzene
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