| http://www.w3.org/ns/prov#value | - A suitable solvent may for example, be selected from aromatic hydrocarbons, for example benzene, toluene, ethylbenzene and the three xylenes; sulfoxides, for example dimethyl sulfoxide and diethyl sulfoxide; sulfones, for example diisopropyl sulfone and tetrahydrothiophene 1,1-dioxide (also referred to as "sulfolane) and ethers, for example anisole, 2,5,8-trioxanonane (also referred to as diglym
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