prov:value
| - ane, cyclohexane or petroleum fractions, or other solvents such as nitromethane, dimethylformamide, dimethylacetamide, 1,2-dimethoxyethane, dimethyl sulphoxide, acetonitrile or pyridine, those preferred are methylene chloride, trichloromethane, tetrahydrofuran or dimethylformamide, preferably in a temperature range from room temperature up to reflux of the solvents at normal pressure. [0146] The c
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