Catalyst reaction method, method for producing formate, and method for producing formic acid

A catalyst reaction method, wherein

• in a catalyst reaction using at least one catalyst selected from the group consisting of a metal complex represented by the following general formula (1A), a tautomer or stereoisomer of the metal complex, and a salt of the metal complex or the tautomer or stereoisomer, a ligand represented by the following general formula (1B) is used in such a manner that a ratio of a substance amount of the ligand to a substance amount of the catalyst in a reaction system is greater than 0 to 15,
• (in the general formula (1A), X represents a zero-valent to monovalent atomic group containing a typical element of Groups 13 to 15 and capable of coordinating to M, Q each independently represents a crosslinked structure containing a typical element of Groups 14 to 16 and connecting Y and X, Y each independently represents a zero-valent to monovalent atomic group containing a typical element of Groups 14 to 16 and capable of coordinating to M, M represents a metal atom, Z represents a halogen atom or a hydrogen atom, n represents an integer of 0 to 3, and when more than one L are present, L each independently represents a neutral or anionic ligand), and
• (in the general formula (1B), X represents the zero-valent to monovalent atomic group containing the typical element of Groups 13 to 15 and capable of coordinating to M in the general formula (1A), Q each independently represents a crosslinked structure containing a typical element of Groups 14 to 16 and connecting Y and X, and Y each independently represents the zero-valent to monovalent atomic group containing the typical element of Groups 14 to 16 and capable of coordinating to M in the general formula (1A)).