| http://www.w3.org/ns/prov#value | - The reaction temperature employed depends on various factors such as the starting materials, the solvent and the metalation agent used, but is generally between ???100??? C. and 100??? C., and preferably between ???70??? C. and 0??? C. The reaction time depends on a number of factors such as the starting materials, the solvent, the metalation agent and the reaction temperature, but is usually from
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