Assertion: benzoic acid's use | /r/HasProperty | combined with a nickel compound
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text: However, according to the present invention, it has been discovered that the combined use of a manganese compound, (which by itself is a catalyst inferior to the cobalt compound), combined with a nickel compound, and at specific ratios, achieves conspicuously synergistic effect, and that excellent reaction results that would be unexpected from use of the cobalt compound along. or the nickel or manganese compound alone, alone,.be obtained.