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Structure of pyridine N-oxide. Oxidation of pyridine occurs at nitrogen to give pyridine N-oxide. The oxidation can be achieved with peracids: [94] C 5 H 5 N + RCO 3 H → C 5 H 5 NO + RCO 2 H. Some electrophilic substitutions on the pyridine are usefully effected using pyridine N-oxide followed by deoxygenation. Addition of oxygen suppresses ...
Structures and names of common heterocyclic compounds Pyridine, a heterocyclic compound. A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). [1]
L n MO + H 2 NR → L n MNR + H 2 O. This approach is illustrated by the conversion of MoO 2 Cl 2 to the diimido derivative MoCl 2 (NAr) 2 (dimethoxyethane), precursors to the Schrock carbenes of the type Mo(OR) 2 (NAr)(CH-t-Bu). [4] L n MCl 2 + 3 H 2 NR → L n MNR + 2 RNH 3 Cl. Aryl isocyanates react with metal oxides concomitant with ...
With a pK a of 5.25 for its conjugate acid, pyridine is about 15x less basic than imidazole. Pyridine is a weak pi-acceptor ligand. Trends in the M-N distances for complexes of the type [MCl 2 (py) 4] 2+ reveal an anticorrelation with d-electron count. [2]
Pyridine-N-oxides bind to metals through the oxygen. According to X-ray crystallography, the M-O-N angle is approximately 130° in many of these complexes. As reflected by the pKa of 0.79 for C 5 H 5 NOH +, pyridine N-oxides are weakly basic ligands. Their complexes are generally high spin, hence they are kinetically labile.
26.4 dyn/cm at 100 °C Viscosity [2] 0.974 mPa·s at 20 °C Thermodynamic properties. Phase behavior ... log 10 of Pyridine vapor pressure. Uses formula: ...
Fe(DIP)(N 2) 2 is a precursor to highly active catalysts for hydrosilylation and hydrogenation reactions. [1] Dissociation of N 2 from Fe(DIP)(N 2) 2 results in binding of the anilino arene in an η 6-fashion. This binding mode may play a role in the catalytic hydrogenation cycle. [1] Structure of Co(DIP)Cl where DIP = C 5 H 3 N-2,6-(C(NAr)Me ...
Pyridine N-oxide is five orders of magnitude less basic than pyridine: the pK a of protonated pyridine-N-oxide is 0.8. [7] Protonated derivatives are isolable, e.g., [C 5 H 5 NOH]Cl. [3] Further demonstrating its (feeble) basicity, pyridine-N-oxide also serves as a ligand in coordination chemistry.