Fluorenone

About: Fluorenone is a research topic. Over the lifetime, 1067 publications have been published within this topic receiving 17162 citations. The topic is also known as: Diphenylene ketone & 9-Oxofluorene.

Computational Study of Lawesson’s Reagent Mediated Fluorenone Dimerization Forming 9,9’-Bifluorenylidene

Abstract: The ambition of this work is to start a path to the a priori rational design of high yield production for electron acceptors with finely tuned band gaps, from the comfort of an armchair. To this end, organic photovoltaics offer a cheap and sustainable means of manufacture using readily available materials and avoids the toxicity of some of the heavy metals used in first and second-generation solar cells such as cadmium. The microwave assisted Lawesson’s reagent mediated one-pot one-step solventless synthesis takes less than 3 minutes and results in an 84% yield of 9,9’-bifluorenylidene from two equivalents of fluorenone. While fullerenes have traditionally been the most widely used electron acceptors in organic photovoltaics, bifluorenylidenes have been gaining attention due to their superior absorption in the visible spectrum, highly tunable band gap and cheap/efficient synthesis. Using an analog system to study the reaction divided into two parts; intermediate formation and sulfur extrusion, a molecular pathway has been devised that fits the reaction conditions and explains differences in % yields of substituted 9,9’bifluorenylidenes reported in a manner readily conducive to making predictions based on the substituents chosen in the 9-fluorenylidene scaffold.

Streptomycete and application thereof in reduction of aromatic ketone

Abstract: The invention relates to the field of biocatalysis, and in particular relates to a streptomyces (Streptomyces sp.DUT003 with the preserving number of CGMCC2518) and application thereof in the reduction of rigid macrocyclic aromatic ketone such as substituted fluorenone. With the streptomyces, aromatic ketone, in particular the rigid macrocyclic aromatic ketone such as the substituted fluorenone can be reduced with high efficiency; products are aromatic alcohol and the aromatic alcohol with optical activity, the problems of synthesizing the aromatic alcohol and the aromatic alcohol with optical activity chemically and industrially are solved, the conversion rate can reach between 89 and 98 percent, the products have high stereoselectivity, and the ee value is between 83 and 100 percent. The streptomyces has the advantages of easy culture, mild reduction and reaction condition, simple operation steps, less environmental pollution, and good prospect of industrial application and development.

Delayed fluorescence light emitting substance, and organic el element

Abstract: PROBLEM TO BE SOLVED: To provide a fluorescence light emitting substance and a thermally activated delayed fluorescence light emitting substance exhibiting a high internal quantum yield, and to provide an organic EL element exhibiting a high external light emitting efficiency obtained by using the fluorescence light emitting substance and the thermally activated delayed fluorescence light emitting substance for a light emitting layer of the organic EL element.SOLUTION: A delayed fluorescence light emitting substance is aromatic hydrocarbon having a substituent Xn in either one of aromatic ring among a benzene ring, a naphthalene ring, a biphenyl ring and a fluorene ring, and the substituent Xn is selected from either one of residues of benzothiazole, coumarin, fluorenone, acridone, quinacridone, acridine, anthraquinone, thioxanthone, phthalimide, naphthyl dicarboimide and pyrene, or a residue of a derivative of the either one, and the number of the substituent is 1 or more. There is also provided an organic EL element containing the delayed fluorescence light emitting substance in a light emitting layer.

Intermediates in the decomposition of aliphatic diazo-compounds. Part 20. Kinetic studies on reductively initiated electron transfer chain catalysis of the decomposition of 9-diazofluorene

Abstract: The method of constant-current electrolysis (c.c.e.) at a platinum cathode has been used to investigate the kinetics of the electron transfer chain catalysis of the decomposition of 9-diazofluorene (FIN2) in CH3CN solution. Equations have been derived for various possible kinetic forms of both chain propagation and termination, and comparison with observation indicates that the chain carrier reacts with a molecule of FIN2 to propagate the chain and reacts with the solvent, or other additive such as oxygen or diethyl malonate, to terminate the chain. Interruption of the current in the experiments (i.c.c.e.) leads to a different set of equations from which it is possible to evaluate separately the rate constants for propagation and termination. The identity of the chain carrier is discussed. It is established that this is unlikely to be the diazolalkane anion radical, FIN2–˙, as previously thought. Anion-radicals derived from the product fluorenone azine are the likeliest candidates under the reaction conditions used.