prov:value
| - The conversion of the compound having the formula (IIa), (IIb), (IX) or (IV) into an alkali metal salt thereof can be conducted at a temperature of about 0??? to about 200??? C., preferably room temperature to 50??? C. in a solvent, for example, aromatic solvents such as benzene, toluene, xylene and the like, n-hexane, cyclohexane, ethers such as diethyl ether, 1,2-dimethoxyethane, dioxane and the
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