| http://www.w3.org/ns/prov#value | - appropriate organic solvent (e.g. methylene chloride); or (g) for compounds of formula Ia in which R5 represents OCH3 or OCH2CH3, reaction of a corresponding compound of formula Ia in which R5 represents OH with dimethylsulfate or diethylsulfate, respectively, for example in the presence of a suitable base (e.g. an alkali metal hydroxide such as KOH (for example in aqueous solution at e.g. 50 wt.
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