Effect of ancillary ligand on the photoluminescent and electroluminescent properties of blue Ir(III) complexes bearing main bipyridine ligand

Despite the widespread applications of C–H functionalization, controlling site selectivity remains a significant challenge. Covalently attached directing group (DG) served as an ancillary ligand to ensure proximal ortho-, distal meta- and para-C-H functionalization over the last two decades. These covalently linked DGs necessitate two extra steps for a single C–H functionalization: introduction of DG prior to C–H activation and removal of DG post-functionalization. We introduce here a transient directing group for distal C(sp2)-H functionalization via reversible imine formation. By overruling facile proximal C-H bond activation by imine-N atom, a suitably designed pyrimidine-based transient directing group (TDG) successfully delivered selective distal C-C bond formation. Application of this transient directing group strategy for streamlining the synthesis of complex organic molecules without any necessary pre-functionalization at the distal position has been explored.

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Iridium Complex Catalyzed Hydrogen Production from Glucose and Various Monosaccharides

Catalysts ◽

10.3390/catal11080891 ◽

2021 ◽

Vol 11 (8) ◽

pp. 891

Author(s):

Ken-ichi Fujita ◽

Takayoshi Inoue ◽

Toshiki Tanaka ◽

Jaeyoung Jeong ◽

Shohichi Furukawa ◽

...

Keyword(s):

Hydrogen Production ◽

Catalytic System ◽

Catalytic Reaction ◽

Hydrogen Gas ◽

Water Soluble ◽

Starting Material ◽

Iridium Complex ◽

Production Of Hydrogen ◽

Bipyridine Ligand

A new catalytic system has been developed for hydrogen production from various monosaccharides, mainly glucose, as a starting material under reflux conditions in water in the presence of a water-soluble dicationic iridium complex bearing a functional bipyridine ligand. For example, the reaction of D-glucose in water under reflux for 20 h in the presence of [Cp*Ir(6,6′-dihydroxy-2,2′-bipyridine)(H2O)][OTf]2 (1.0 mol %) (Cp*: pentamethylcyclopentadienyl, OTf: trifluoromethanesulfonate) resulted in the production of hydrogen gas in 95% yield. In the present catalytic reaction, it was experimentally suggested that dehydrogenation of the alcoholic moiety at 1-position of glucose proceeded.

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Catalytic hydrosilylation of olefins and ketones by base metal complexes bearing a 2,2′:6′,2″-terpyridine ancillary ligand

Inorganica Chimica Acta ◽

10.1016/j.ica.2021.120403 ◽

2021 ◽

Vol 523 ◽

pp. 120403

Author(s):

Katsuaki Kobayashi ◽

Hiroshi Nakazawa

Keyword(s):

Metal Complexes ◽

Base Metal ◽

Ancillary Ligand ◽

Catalytic Hydrosilylation

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Self-assembled luminescent Cu(I) tetrametallic metallacycles based on 3,3’-bipyridine ligand

Organic Chemistry Frontiers ◽

10.1039/d1qo00538c ◽

2021 ◽

Author(s):

Christophe Lescop ◽

Guillaume Calvez ◽

Florent Moutier ◽

Jana Schiller

Keyword(s):

Supramolecular Chemistry ◽

Bipyridine Ligand ◽

Self Assembled

3,3’-bipyridine ligand B was reacted with pre-assembled [Cu2(2-dppm)2] Cu(I) bimetallic flexible precursor A accordingly to coordination-driven supramolecular chemistry synthetic principles. Outcomes obtained revealed the necessity to formally introduce bridging halide...

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