1393570-07-4

Upstream product

• 1120-87-2 4-bromopyridin 
• 127-17-3 2-oxo-propionic acid 
• 138-60-3 chelidamic acid 
• 2033-24-1 cycl-isopropylidene malonate 
• 206647-42-9 4-bromo-2,6-pyridinedicarboxylic acid chloride 
• 162102-81-0 4-bromopyridine-2,6-dicarboxylic acid 
• 162102-79-6 dimethyl 4-bromo-2,6-pyridinedicarboxylate 
• 499-51-4 Chelidamic acid 
• 1422463-81-7 4-bromo-2,6-bis(1-pyrrolidinylcarbonyl)pyridine 
• 676-58-4 methylmagnesium chloride 
• 120491-93-2 4-bromopyridine-2,6-dicarbonyl dibromide 

Relevant academic research and scientific papers

Ditopic Chiral Pineno-Fused 2,2′:6′,2″-Terpyridine: Synthesis, Self-Assembly, and Optical Properties

The syntheses of 4′-substituted chiral 2,2′:6′,2″-terpyridine (tpy) ligands with predetermined configurations and directionalities are rather limited in the supramolecular chemistry field. In this study, a carbazole-linked ditopic chiral ligand L was synthesized using 4′-bromo-substituted pineno-fused tpy 5 as the precursor. Upon complexation with Cd(NO3)2·4H2O and Zn(NO3)2·6H2O, two enantiomerically pure metallosupramolecules, [Cd3L3] and [Zn4L4], have been self-assembled and characterized by NMR, electrospray ionization-mass spectrometry, traveling wave ion mobility-mass spectrometry, and DOSY analysis. In addition, their optical properties are characterized by UV-vis, fluorescence, circular dichroism, and circularly polarized luminescence, suggesting an efficiency transmission and amplification of chirality from the ligand to metal center via self-assembly.

Enhancing a Molecular Electrocatalyst's Activity for CO2Reduction by Simultaneously Modulating Three Substituent Effects

The electrocatalytic activity for CO2 reduction is greatly enhanced for Co complexes with pyridyldiimine-based ligands through the stepwise integration of three synergistic substituent effects: extended conjugation, electron-withdrawing ability, and intramolecular electrostatic effects. The stepwise incorporation of these effects into the catalyst structures results in a series of complexes that show an atypical inverse scaling relationship for CO2 reduction - the maximum activity of the resulting catalysts increases as the onset potentials are driven positive due to the ligand electronic substituent effects. Incorporating all three effects simultaneously into the catalyst structure results in a Co complex [Co(PDI-PyCH3+I-)] with dramatically enhanced activity for CO2 reduction, operating with over an order of magnitude higher activity (TOFcat = 4.1 × 104 s-1) and ～0.2 V more positive catalytic onset (Eonset = -1.52 V vs Fc+/0) compared to the parent complex, an intrinsic activity parameter TOF0 = 6.3 × 10-3 s-1, and >95% Faradaic efficiency for CO production in acetonitrile with 11 M water. This makes [Co(PDI-PyCH3+I-)] among the most active molecular catalysts reported for the CO2 reduction reaction. Our work highlights a promising catalyst design strategy for molecular CO2RR catalysts in which catalytic ability is enhanced by tuning three synergistic substituent effects simultaneously in a single catalyst structure.

Pinene condensed chiral terpyridyl bidentate compound and preparation method thereof

The invention discloses a pinene condensed chiral terpyridyl bidentate compound and a preparation method thereof. The compound has a structure formula shown in the description. Commercial diethyl oxalate and acetone are adopted as initial raw materials, the initial raw materials are subjected to a Suzuki coupling reaction with a boronic acid pinacol ester compound, and thus a chirally modified terpyridyl bidentate ligand is synthesized. The synthesis method disclosed by the invention is simple in operation, and the raw materials are low in price and easy to obtain. A terpyridyl compound can beused as the tridentate ligand to form a stable complex together with multiple transition metals and rare earth metal ions, and in addition, the complex has good catalysis performance and special redox, photophysical properties, and the like, and can be applied to fields such as material science, life science, supramolecular self assembling, molecular catalysis and DNA (deoxyribonucleic acid) chips.

METHODS AND COMPOUNDS FOR ENHANCING CONTRAST IN MAGNETIC RESONANCE IMAGING (MRI)

The present application relates to methods and compounds for enhancing contrast in magnetic resonance imaging. The methods comprise administering compounds of Formula I(a) or I(b) to a subject and obtaining a magnetic resonance image of the subject. The present application also relates to methods of preparing compounds of the Formula I(a) as well as intermediate compounds used in such a method of preparation.

A convenient approach for the synthesis of 2,6-diformyl- and 2,6-diacetylpyridines

2,6-Diformyl- and 2,6-diacetylpyridines are readily accessed in good yields (60-90%) via the single-pot reaction of 2,6-pyridine dicarboxamides with LiAlH4 or MeMgCl in THF at 0-20°C. The high efficiency of the method illustrates the significance of solubility in the reduction and alkylation of difunctionalized substrates.