Search results
Results from the WOW.Com Content Network
The reaction of O 2 BF 4 with xenon at 173 K (−100 °C) produces a white solid believed to be F–Xe–BF 2, containing an unusual xenon-boron bond: [14] 2 O 2 BF 4 + 2 Xe → 2 O 2 + F 2 + 2 FXeBF 2. The dioxygenyl salts O 2 BF 4 and O 2 AsF 6 react with carbon monoxide to give oxalyl fluoride, C 2 O 2 F 2, in high yield. [15]
In organic chemistry, the Mannich reaction is a three-component organic reaction that involves the amino alkylation of an acidic proton next to a carbonyl (C=O) functional group by formaldehyde (H−CHO) and a primary or secondary amine (−NH 2) or ammonia (NH 3). [1] The final product is a β-amino-carbonyl compound also known as a Mannich base.
Like phenols, aniline derivatives are highly susceptible to electrophilic substitution reactions. Its high reactivity reflects that it is an enamine, which enhances the electron-donating ability of the ring. For example, reaction of aniline with sulfuric acid at 180 °C produces sulfanilic acid, H 2 NC 6 H 4 SO 3 H.
The displaced halide anion then usually reacts via another S N 2 reaction on one of the R 1 carbons, displacing the oxygen atom to give the desired phosphonate (4) and another alkyl halide (5). This has been supported by the observation that chiral R 1 groups experience inversion of configuration at the carbon center attacked by the halide anion.
The charge on the ion is +5 − 3 × 2 = −1, and so the formula is ClO − 3. The structure of the ion is predicted by VSEPR theory to be pyramidal, with three bonding electron pairs and one lone pair. In a similar way, The oxyanion of chlorine(III) has the formula ClO − 2, and is bent with two lone pairs and two bonding pairs.
As shown in the example below, this was executed by a transannular halide abstraction strategy through the reaction of the oxonium ion precursor (an organic halide) with the silver salt of the Krossing's anion Ag[Al(pftb) 4]•CH 2 Cl 2, generating the desired oxonium ion with simultaneous precipitation of inorganic silver halides.
Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH 3 CO) 2 O.Commonly abbreviated Ac 2 O, it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis.
The anionic charge is delocalized over the oxygen and the two carbon sites. Thus they have the character of both an alkoxide and a carbanion. [5] Although they are often drawn as being simple salts, in fact they adopt complicated structures often featuring aggregates. [6] Structure of the lithium enolate PhC(OLi)=CMe 2 (tmeda) dimer. H atoms ...