| http://www.w3.org/ns/prov#value | - Process according to any one of the preceding paragraphs, characterized in that it is used in the presence of an organic solvent chosen from aromatic hydrocarbons, in particular toluene, halogenated solvents such as dichloromethane, alcohols such as methanol, nitrites such as acetonitrile, ethers such as THF or sulphoxides such as DMSO. [0038] 15.
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