479-33-4 Usage
Chemical Properties
Tetraphenylcyclopentadienone is an organic compound with the formula (C6H5)4C4CO. It is a dark purple to black crystalline solid that is soluble in organic solvents. It is an easily made building block for many organic and organometallic compounds.
Uses
Tetraphenylcyclopentadienone is a building block for several organic and organometallic compounds. It is also used as an efficient cyclone system or in re-circulation systems for the capturing of fine active pharmaceuticals and food ingredients.
Preparation
Tetraphenylcyclopentadienone can be synthesized by a double aldol condensation involving benzil and dibenzyl ketone in the presence of a basic catalyst.Tetraphenylcyclopentadienone has been prepared by the action of phenylmagnesium bromide on benzaldiphenylmaleide, and by reduction, dehydration, and oxidation of the methylenedesoxybenzoin obtained by condensing formaldehyde with desoxybenzoin. The present procedure is essentially that of Dilthey.Synthesis of tetraphenylcyclopentadienone
Agricultural Uses
Tetraphenylcyclopentadienone is a dust-collecting device consisting of a cylindrical chamber, the lower portion of which is tapered to fit into a cone-shaped receptacle below it, is called a cyclone. Dust-laden air enters through a vertical slot-like duct on the upper wall of the chamber at the rate of at least 30meters a second. Since the particles enter at a tangent, they whirl in a circular or cyclonic path within the chamber. The centrifugal force exerted on the particles is proportional to their weight and square of their velocity. The particles slide along the walls of the chamber and gradually circulate down into the conical receptor, while the clean air escapes through a central pipe at the bottom. The dust accumulates in the cone and is discharged continuously or at intervals. The larger the particles, the more efficient the process of their removal. In simple cyclones, particles below 50microns in diameter are not retained, but improved models retain particles as small as 20microns.
Cyclones are used in handling and granulating fertilizers to avoid air pollution and are a safety requirement in the production plants.
Check Digit Verification of cas no
The CAS Registry Mumber 479-33-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,7 and 9 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 479-33:
(5*4)+(4*7)+(3*9)+(2*3)+(1*3)=84
84 % 10 = 4
So 479-33-4 is a valid CAS Registry Number.
InChI:InChI=1/C29H20O/c30-29-27(23-17-9-3-10-18-23)25(21-13-5-1-6-14-21)26(22-15-7-2-8-16-22)28(29)24-19-11-4-12-20-24/h1-20H
479-33-4Relevant articles and documents
Maitlis,Games
, p. 1887 (1963)
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Cetini et al.
, p. 437 (1969)
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Tetraaryl Cyclopentadienones: Experimental and Theoretical Insights into Negative Solvatochromism and Electrochemistry
Meitinger, Nicolas,Mengele, Alexander K.,Witas, Kamil,Kupfer, Stephan,Rau, Sven,Nauroozi, Djawed
, p. 6555 - 6562 (2020/10/02)
The synthesis of a series of tetraaryl cyclopentadienones comprising different substitution patterns is reported. Their photophysical and electrochemical properties are investigated by UV/Vis spectroscopy and cyclic voltammetry as well as by supporting quantum chemical simulations and reveal a distinct effect of substituents on the redox behavior of the molecules as well as the absorption properties of this class of compounds. While electrochemical data display a shift in reduction potential of up to 200 mV between the differently substituted cyclopentadienones, their photophysical investigations in differently polar solvents suggest a negative solvatochromic effect, although protic solvents induce a bathochromic shift. Crystal structure analyses of some derivatives confirm similarity with related cyclopentadienones while providing insight into intermolecular C–H···O and C–H···π interactions in the solid state.
Highly Stable, Low Gas Crossover, Proton-Conducting Phenylated Polyphenylenes
Adamski, Michael,Skalski, Thomas J. G.,Britton, Benjamin,Peckham, Timothy J.,Metzler, Lukas,Holdcroft, Steven
supporting information, p. 9058 - 9061 (2017/07/24)
Two classes of novel sulfonated phenylated polyphenylene ionomers are investigated as polyaromatic-based proton exchange membranes. Both types of ionomer possess high ion exchange capacities yet are insoluble in water at elevated temperatures. They exhibit high proton conductivity under both fully hydrated conditions and reduced relative humidity, and are markedly resilient to free radical attack. Fuel cells constructed with membrane-electrode assemblies containing each ionomer membrane yield high in situ proton conductivity and peak power densities that are greater than obtained using Nafion reference membranes. In situ chemical stability accelerated stress tests reveal that this class of the polyaromatic membranes allow significantly lower gas crossover and lower rates of degradation than Nafion benchmark systems. These results point to a promising future for molecularly designed sulfonated phenylated polyphenylenes as proton-conducting media in electrochemical technologies.
