| http://www.w3.org/ns/prov#value | - thylformamide and N-methyl-pyrrolidone, and, only in the event that compounds of the formula (VI) are employed, alcohols, such as methanol, ethanol, propanol, iso-propanol, butanol, iso-butanol and tert-butanol, and, if appropriate, in the presence of a base, suitable bases being, in the event that compounds of the formula (V) are employed, inorganic bases, in particular alkali metal carbonates or
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