Topic
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.
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Patent•
27 Feb 2008
TL;DR: In this article, an improved 2,7-bis[2-(diethylamino)ethoxy]fluorenone dihydrochloride production process comprising stages of sulfurization of fluorenone followed by neutralization of obtained reaction mass was described.
Abstract: FIELD: industrial organic synthesis ^ SUBSTANCE: invention provides improved 2,7-bis[2-(diethylamino)ethoxy]fluorenone dihydrochloride production process comprising stages of sulfurization of fluorenone followed by neutralization of obtained reaction mass, isolation of purified fluorenone-2,7-disulfonic acid disodium salt, "alkaline melting" of this salt in presence of sodium nitrate to form 44'-dihydroxydiphenyldicarboxylic acid, cyclization to form 2,7-dihydroxyfluorene and alkylation thereof More specifically, 2,7-dihydroxyfluorene obtained in cyclization stage is converted into alkali metal salt and toluene solution of 2-diethylaminoethyl chloride is added to preheated aqueous solution of the above salt at molar ratio 1:(3-5), preferably 1:4, to form 2,7-bis[2-(diethylamino)ethoxy]fluorenone, which is then treated with concentrated aqueous hydrochloric acid at molar ratio 1:(35-4), preferably 1:35 ^ EFFECT: increased yield and improved quality of product, and simplified process ^ 3 cl, 3 dwg, 4 ex
1 citations
TL;DR: In this paper, the selectivity of a titanium (III) species electrochemically generated from Cp 2 TiCl 2 for the reduction of the 4,4′-dinitrodibenzyle and the 9-fluorenone was investigated.
1 citations
Patent•
16 Jul 2009
1 citations
Patent•
15 Apr 2004
TL;DR: In this paper, a method was proposed to form an insoluble matter under heating in the presence of an acid catalyst, and an impurity (the one bearing hydroxy group, e.g., 9-methyl-9-fluorenol) in fluorenone was converted into a derivative having a solubility or boiling point different from that of fluorescence.
Abstract: PROBLEM TO BE SOLVED: To simply and efficiently manufacture high-purity fluorenone by separating and removing impurities from fluorenone at a high degree. SOLUTION: By such a method as to form an insoluble matter under heating in the presence of an acid catalyst, an impurity (the one bearing hydroxy group, e.g., 9-methyl-9-fluorenol) in fluorenone is converted into a derivative having a solubility or boiling point different from that of fluorenone. The derivative is separated and removed from fluorenone, giving high-purity fluorenone. When analyzed by gas chromatography at a column temperature of 180°C by using a silica gel as a column filler, the high-purity fluorenone substantially exhibits no peak within a retention time of 16-18 min and exhibits a single peak within a retention time of 18.5-19.5 min. An ethanol solution of the high-purity fluorenone with a concentration of 20 wt.% has a transmittance of 99% or higher at a wavelength of 600 nm. COPYRIGHT: (C)2004,JPO
1 citations
TL;DR: The synthetic sequence involving the oxidation of fluorene to fluorenone and the reduction of fluorenol to fluorenols can be extended by preparing the title compounds via the intermediate 9-chlorofluorene.
Abstract: The synthetic sequence involving the oxidation of fluorene to fluorenone and the reduction of fluorenone to fluorenol can be extended by preparing the title compounds via the intermediate 9-chlorofluorene. The latter is obtained by heating fluorenol in methanol with conc. hydrochloric acid.
1 citations