| prov:value
| - Preferred aryloxy compounds of element M comprise an aryloxy radical RO with general formula: where R1, R2, R3, R4 and R5, which may be identical or different, each represent a hydrogen atom, a halogen atom or a hydrocarbyl radical, for example alkyl, cycloalkyl, alkenyl, aryl, or aralkyl, substituted aryl or cycloalkyl, preferably containing 1 to 16 carbon atoms, more particularly 1 to 10 carbon
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