Ligand for forming ruthenium complex, ruthenium complex catalyst, production method therefor and use thereof

A method for producing a ruthenium complex catalyst, the method comprising:

• a first step of preparing a pyridine derivative;
• a second step of forming a 2-fluoropyridine derivative by selective fluorination;
• a third step of forming a fluoropyridine carboxaldehyde from the 2-fluoropyridine derivative;
• a fourth step of forming an imine by reaction of the fluoropyridine carboxaldehyde with an aniline compound;
• a fifth step of forming a ligand having a structure of a following Chemical Formula 1a by an intramolecular cyclization reaction of the imine with AgOTf and tBuCO2CH2Cl;
• and
• a sixth step of binding the ligand to Ru to form a ruthenium complex catalyst having a structure of a following Chemical Formula 2a:
• wherein R1 comprises an atom or atomic group smaller than R2,
• wherein each of R3, R4, R5 and R6 is selected from the group consisting of hydrogen, a halogen atom, a linear or branched alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms.

A ligand for ruthenium complex formation, the ligand having a structure represented by a following Chemical Formula 1a:

• wherein R1 represents F or Cl,
• wherein R2 represents MEP(2-methyl-6-ethylphenyl), DEP(2,6-diethylphenyl), DIPP(2,6-diisopropylphenyl), IPP(2-isopropylphenyl) or TBP(2-t-butylphenyl),
• wherein each of R3, R5 and R6 represent hydrogen, and
• wherein R4 represents t-Bu or Cl.