| http://www.w3.org/ns/prov#value | - the formula (XII), [0180] in which [0181] R2 and R3 have the meaning indicated above, and [0182] R8 represents (C1-C4)-alkyl, preferred methyl or ethyl, [0183] in inert solvents, for example alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol or tert-butanol, or other solvents such as dimethylformamide or dimethyl sulphoxide, those preferred are methanol or ethanol, in a tempera
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