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The Ph 3 C-H bond is relatively weak, with a bond dissociation energy (BDE) of 81 kcal/mol, or about 24 kcal/mol less than methane. [4] Correspondingly, triphenylmethane is mildly acidic, with a pK a of 33.297.
Triphenylphosphine (IUPAC name: triphenylphosphane) is a common organophosphorus compound with the formula P(C 6 H 5) 3 and often abbreviated to P Ph 3 or Ph 3 P. It is versatile compound that is widely used as a reagent in organic synthesis and as a ligand for transition metal complexes, including ones that serve as catalysts in organometallic chemistry.
Triphenylmethanol features three phenyl (Ph) rings and an alcohol group bound to a central tetrahedral carbon atom. All three C–Ph bonds are typical of sp 3-sp 2 carbon-carbon bonds with lengths of approximately 1.47 Å, while the C–O bond length is approximately 1.42 Å.
Ph 3 PO is structurally related to POCl 3. [2] As established by X-ray crystallography, the geometry around P is tetrahedral, and the P-O distance is 1.48 Å. [3] Other modifications of Ph 3 PO have been found: For example, a monoclinic form crystalizes in the space group P2 1 /c with Z = 4 and a = 15.066(1) Å, b = 9.037(2) Å, c = 11.296(3) Å, and β = 98.47(1)°.The orthorhombic ...
Pentaethylenehexamine is a hexadentate ligand, owing to the Lewis basicity of the six amine groups. [3] Pentaethylenehexamine is in the category of polyethyleneamines and is part of mixtures of these sold commercially. [2] Commercial supplies of pentaethylenehexamine contain, in addition to the linear form, branched and cyclic polyamines. [2]
PCl 3 + 3 C 2 H 5 OH → (C 2 H 5 O) 2 P(O)H + 2 HCl + C 2 H 5 Cl. Under similar conditions but in the presence of base, triethyl phosphite results: [3] PCl 3 + 3 EtOH + 3 R 3 N → P(OEt) 3 + 3 R 3 NH + 3 Cl −. Many analogues of diethyl phosphite can be prepared.
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The measurement of pH can become difficult at extremely acidic or alkaline conditions, such as below pH 2.5 (ca. 0.003 mol/dm 3 acid) or above pH 10.5 (above ca. 0.0003 mol/dm 3 alkaline). This is due to the breakdown of the Nernst equation in such conditions when using a glass electrode.