prov:value
| - ne, toluene, hexane, cyclohexane or petroleum fractions, or other solvents such as nitromethane, dimethylacetamide, 1,2-dimethoxyethane, dimethyl sulphoxide, acetonitrile or pyridine, that preferred is 1,2-dichloroethane, preferably in a temperature range from 40??? C. up to reflux of the solvents at normal pressure. (cf. for example Charles et al.
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