| http://www.w3.org/ns/prov#value | - When Me signifies a bivalent metal ion, the compound of formula I, wherein Me signifies hydrogen, may be converted first into the alkali metal salt, e.g. by dissolving the compound of formula I in alcohol and adding an alkali hydroxide such as NaOH or KOH. A Me- salt, e.g. the chloride, is subsequently added to the reaction mixture and the desired product is then obtained.
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