| http://www.w3.org/ns/prov#value | - In the case of the dihalides VIII or IX (X???Y???Br or Cl), the elimination of HY is followed by base-catalysed hydrolysis, for example, in the presence of alkali alkoxides, such as sodium methoxide, at temperatures between 20 and 100??? C., preferably between 30 and 95??? C., particularly preferably between and 90??? C., which leads to the desired dibenzoylmethane compounds of the formula I.
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