| http://www.w3.org/ns/prov#value | - The compound represented by the formula (IX) can be obtained, for example, by reacting a compound represented by the formula (XI), ##STR123## wherein X is a halogen atom, and m and Y are as defined above, with metallic lithium, metallic sodium, metallic magnesium or alkyllithium (e.g. n-butyllithium).
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