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.

Synthesis of isoindoline nitroxides by electrocyclic reactions

Abstract: The Suzuki reaction of the pyrroline nitroxide, 3-bromo-4- formyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-1-yloxyl radical, with vinylboronic acids and subsequent Horner-Wadsworth-Emmons reaction followed by electocyclic reaction of the thus formed 1,3,5-triene and oxidation offers a new route for the synthesis of 5,6-disubstituted 1,1,3,3-tetramethylisoindolin-2-yloxyl radicals. The alternative Diels-Alder reaction pathway sometimes resulted in poor yields. Starting from 5-(ethoxycarbonyl)-1,1,3,3-tetramethyl-6-phenylisoindolin-2-yloxyl radical we obtained a spin-labeled fluorenone.

Determination and Analysis of Solubility of 2-Bromo-9-fluorenone in 10 Different Organic Solvents and Three Binary Solvent Mixtures at Different Temperatures (T = 278.15–323.15 K)

Abstract: This article deals with the saturated solubility and solvation behavior of 2-bromo-9-fluorenone in 10 industrial common solvents and three binary mixed solvents by means of experimental and mathematical correlations. Solubility experiments were investigated using the static equilibrium method combined with high-performance liquid chromatography (HPLC) from 278.15 to 323.15 K at atmospheric pressure. The results showed that the maximum and minimum solubility of 2-bromo-9-fluorenone was 0.0526 (mole fraction) in 1,4-dioxane at 323.15 K and 0.0002 (mole fraction) in methanol at 278.15 K, respectively, and the solubility increased with the increase in temperature in all solvents. Furthermore, the solubility data of 2-bromo-9-fluorenone was analyzed using the Apelblat model, the Buchowski–Ksiazaczak λh model in pure solvents, CNIBS/R-K model, and the Jouyban–Acree model in binary solvent mixtures. By error comparison, the Apelblat model and the CNIBS/R-K model can better predict the solubility of 2-bromo-9-fluorenone. In addition, the solvation behavior was illustrated by the KAT-LSER model in pure solvents, and the result shows that the cohesive energy density in the solution is the main factor affecting 2-bromo-9-fluorenone. Therefore, the solubility data is very important for optimizing the extraction process and recrystallizing 2-bromo-9-fluorenone to obtain a higher yield in industry production.

Carbon-carbon bond forming reaction to use fluorenone imine

Abstract: PROBLEM TO BE SOLVED: To provide a diamine analog or an amino alcohol analog in high efficiency. SOLUTION: There is provided a reaction method for forming a carbon-carbon bond comprising a reaction of a fluorenone imine compound with a compound expressed by general formula [II] or a carbonyl compound to synthesize the diamine analog or the amino alcohol analog. COPYRIGHT: (C)2011,JPO&INPIT

Economical, ecologically friendly prepn. of fluorene-bisphenol(s)

Abstract: In the prepn. of fluorene-bisphenols (I) by reacting fluorenone (II) with phenols in the presence of strongly acid ion exchange resin (III) based on styrene with SO3H gps., (a) gelatinous (II) crosslinked with 1-6 wt.% DVB is used; and (b) the mother liquor contg. isomers, oligomers and by-prods., obtd. by sepg. most of (I), is treated with (III) and the by-prods. are converted to (I).

Synthetic method of 3-bromo-9,9'-spirobifluorene

Abstract: The invention discloses a synthetic method of 3-bromo-9,9'-spirobifluorene and belongs to the field of organic chemical synthesis. The synthetic method is implemented by the following steps: under the protection of an inert gas, after preparation of a Grignard reagent in a methyltetrahydrofuran solvent by taking 1,3-dibromo-benzene as the starting material, the Grignard reagent is catalyzed by zinc bromide, the obtained product reacts with o-halogen iodobenzene and magnesium powder, the reaction product reacts with fluorenone, then hydration is performed, and under catalysis of sodium phosphate, 3-bromo-9,9'-spirobifluorene is obtained by intramolecular closed-loop synthesis. The synthetic method is simple in process, the raw materials are low in price and easily accessible, the product production cost is remarkably reduced, and application of fluorene derivatives to design and synthesis of organic photoelectric materials as intermediates is expanded.