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•
10 Aug 1999
TL;DR: In this article, a biphenyl derivative of formula I is subjected to ring formation in the presence of methanesulfonic acid in a solventless state generally at a temp. of room temperature to 150 deg.C for 1-5 hours.
Abstract: PROBLEM TO BE SOLVED: To obtain a high-purity fluorenone derivative industrially safely and simply under mild conditions in a high yield without requiring a complicated separating means, by subjecting a biphenyl derivative to ring formation in the presence of methanesulfonic acid and dealkylating the obtained fluorenone derivative. SOLUTION: A biphenyl derivative of formula I (R is H or a lower alkoxy; R is H, a lower alkenyl or the like; R is a lower alkyl; R is H, a lower alkenyl or the like; (p) and (q) are each 1-3) is subjected to ring formation in the presence of methanesulfonic acid in a solventless state generally at a temp. of room temperature to 150 deg.C for 1-5 hours. The obtained fluorenone derivative of formula II is heat-treated and dealkylated in a mixture of an acid and a solvent usually at a temp. of 30-150 deg.C for 1-15 hours to give the objective compound of formula III (e.g. 2,5-dihydroxy-1,3,6,8-tetrapropyl-9- fluorenone or the like).
2 citations
TL;DR: In this article, electron spin resonance studies of radical-anions1 of the thiophene analogues of fluorenone (cyclopentadithiophenones, IA-VIA) and dibenzothiophene-dioxide (dithienothiophen-dioxides, IB-VIB) deuteriumhydrogen exchange phenomena were observed.
Abstract: During electron spin resonance studies of radical-anions1 of the thiophene analogues of fluorenone (cyclopentadithiophenones, IA-VIA) and dibenzothiophene-dioxide (dithienothiophene-dioxides, IB-VIB) deuteriumhydrogen exchange phenomena were observed.
2 citations
TL;DR: In this paper, the authors used microwave dielectric absorption to study the excited triplet states formed by the laser flash photolysis and reported the triplet state lifetime and dipole moments of fluorenone and its derivatives.
Abstract: The technique of time resolved microwave dielectric absorption has been used to study the excited triplet states formed by the laser flash photolysis. The details of the experimental method and apparatus are discussed. The triplet state lifetimes and triplet state dipole moments of fluorenone and its derivatives are reported. The triplet state lifetime of fluorenone agrees with that obtained by optical absorption. The lifetime measurements with argon purging and with air equilibrated solution confirm the formation of triplet states. A marked increase in the triplet state dipole moment of fluorenone and its derivatives is observed and implies that their lowest triplet state is of (π, π * ) in nature.
2 citations
TL;DR: In this paper , the authors describe the development of a series of strong electron-deficient acceptor units, namely, fluorenone imide (FOI) and its derivatives, functionalized with various electron-withdrawing groups.
2 citations
TL;DR: A series of hexacatenars, where the central fluorenone is connected two α-cyanostilbene which is substituted with 3,4,5-trialkoxybenzyl, was synthesized by Pd-catalyzed Suzuki coupli... as discussed by the authors.
Abstract: In this paper, a series of hexacatenars, where the central fluorenone is connected two α-cyanostilbene which is substituted with 3,4,5-trialkoxybenzyl, was synthesized by Pd-catalyzed Suzuki coupli...
2 citations