Patent ID: 9637425
Date: 2017-05-02
CPC Classifications: B01J,C07B,C07C,C07F

Claim:
1. A catalyst, comprising a NCN pincer ligand group VI metal complex, wherein the NCN pincer ligand is in the dianionic form or trianionic form having the structures: wherein the group VI metal is in the +2 oxidation state or +4 oxidation state where the NCN pincer ligand with N and C are nitrogen and carbon anion sites of the NCN pincer ligand and HN is a neutral site and metal ion form a pair of five-member rings or a pair of six-member rings in the complexes and where R is 2,6-bis-(i-propyl)phenyl, 3,5-bis-(methyl)phenyl, 3,5-bis-(trifluoromethyl) phenyl, 3,5-bis-(i-propyl)phenyl, mesytyl, or tri-i-propylsilyl and R′ is a normal alkyl group or a phenyl group, and wherein the NCN pincer ligand in the triprotonated form is: where R is 2,6-bis-(i-propyl)phenyl, 3,5-bis-(methyl)phenyl, 3,5-bis-(trifluoromethyl) phenyl, 3,5-bis-(i-propyl)phenyl, mesytyl, or tri-i-propylsilyl and where L is tetrahydrofuran (THF).