Search results
Results from the WOW.Com Content Network
The general structure of an oxocarbenium ion. In organic chemistry, an oxocarbenium ion (alternatively spelled oxacarbenium) is a chemical species characterized by a central sp 2-hybridized atom of carbon, a substituent atom of oxygen, and an overall positive charge that is delocalized between the central carbon and oxygen atoms (R 2 [CO] + R). [1]
Another class of oxonium ions encountered in organic chemistry is the oxocarbenium ions, obtained by protonation or alkylation of a carbonyl group e.g. R−C= + −R′ which forms a resonance structure with the fully-fledged carbocation R− + −O−R′ and is therefore especially stable:
A carbenium ion is a positive ion with the structure RR′R″C +, that is, a chemical species with carbon atom having three covalent bonds, and it bears a +1 formal charge. Carbenium ions are a major subset of carbocations, which is a general term for diamagnetic carbon-based cations. In parallel with carbenium ions is another subset of ...
After a Prilezhaev-type oxidation of the silyl enol ether with the peroxyacid to form the siloxy oxirane intermediate, acid-catalyzed ring-opening yields an oxocarbenium ion. [1] [4] This intermediate then participates in a 1,4-silyl migration (Brook rearrangement) to give an α-siloxy carbonyl derivative that can be readily converted to the α ...
The carbamate is formed when an uncharged lysine side chain near the ion reacts with a carbon dioxide molecule from the air (not the substrate carbon dioxide molecule), which then renders it charged, and, therefore, able to bind the Mg 2+ ion. [11] Carbamate formation is a critical step in the formation of biomass from atmospheric carbon dioxide.
Carboxylate ion Acrylate ion. In organic chemistry, a carboxylate is the conjugate base of a carboxylic acid, RCOO − (or RCO − 2). It is an anion, an ion with negative charge. Carboxylate salts are salts that have the general formula M(RCOO) n, where M is a metal and n is 1, 2,....
Acylium ions are intermediates in several reactions, such as the Friedel-Crafts acylation of arenes by acetyl chloride in the presence of aluminium trichloride: C 6 H 5 R + CH 3 CO + + AlCl − 4 → CH 3 COC 6 H 4 R + HCl + AlCl 3. Such depictions may be simplistic because of ion-pairing between the acetyl cation (an acylium cation) and the ...
Some are useful commercially, but the topic has attracted regular scholarly scrutiny. Oxalate (C 2 O 4 2-) is a kind of dicarboxylate ligand. [1] As a small, symmetrical dinegative ion, oxalate commonly forms five-membered MO 2 C 2 chelate rings. Mixed ligand complexes are known, e.g., [Co(C 2 O 4)(NH 3) 4] κ+. [2]