Search results
Results from the WOW.Com Content Network
The reaction with many Lewis acids results in the addition to the nitrogen atom of pyridine, which is similar to the reactivity of tertiary amines. The ability of pyridine and its derivatives to oxidize, forming amine oxides (N-oxides), is also a feature of tertiary amines. [86] The nitrogen center of pyridine features a basic lone pair of ...
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]
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 ...
Heterocyclic organic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of organic heterocycles. [ 2 ] Examples of heterocyclic compounds include all of the nucleic acids , the majority of drugs, most biomass ( cellulose and related materials), and many natural and synthetic dyes.
The nitrogen (N)-containing aromatic rings can be separated into basic aromatic rings that are easily protonated, and form aromatic cations and salts (e.g., pyridinium), and non-basic aromatic rings. In the basic aromatic rings , the lone pair of electrons is not part of the aromatic system and extends in the plane of the ring.
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 ...
[4] σ-adduct (Meisenheimer adduct) formation; Evidence indicates that before addition of the amino group, the ring nitrogen atom is sorbed onto the surface of sodium amide and the sodium cation forms a coordination complex. [3] This increases the δ+ on the α-carbon atom, thus 1,2-addition of sodium amide is favored over 1,4-addition.
MCl x + H 2 P → M(P)Cl 2−x + 2 HCl. Two pyrrole protons are lost. The porphyrin dianion is an L 2 X 2 ligand. These syntheses require somewhat forcing conditions, [9] consistent with the tight fit of the metal in the N 4 2-"pocket." In nature, the insertion is mediated by chelatase enzymes. The insertion of a metal proceeds by the ...