Showing papers on "Fluorenone published in 1987"
TL;DR: In this article, the Pschorr reaction by Ru(bpy) 3 2+ in the fluorenone, fluorene and dibenzofuran series occurs with a low yield and slow rate in contrast with the photocatalysis previously observed for the phenanthrene series.
47 citations
TL;DR: Ce procede de deuteriation applique applique aux acetophenone, benzene, fluorenone, naphtalenecarbaldehyde-1, tetrahydro-1 2,2,3,4, 4, naphacetophenone-1 1, 2, 3, 4 naphtalinenone 1, 1.
Abstract: Ce procede de deuteriation applique aux acetophenone, benzophenone, fluorenone, naphtalenecarbaldehyde-1, tetrahydro-1,2,3,4 naphtalenone-1, conduit aux hydrocarbures correspondants
20 citations
TL;DR: In this article, the deoxygenation of 9-diazofluorene in the presence of epoxides yields fluorenone and an equimolar concentration of the alkene formed from the stereospecific deoxygation of the epoxide.
15 citations
TL;DR: In this article, the reaction of C 8 K avec des benzoates de methyle, d'ethyle, biphenyledicarboxylate-2,2' de dimethyle et la fluorenone
Abstract: Reaction de C 8 K avec des benzoates de methyle, d'ethyle, biphenyledicarboxylate-2,2' de dimethyle et la fluorenone
14 citations
8 citations
TL;DR: The diamagnetic monomer dianion of fluorenone was prepared from 1,2-dimethoxyethane solution of neutral molecule in contact with excess sodium metal at −5 °C for 5 days and its 1H and 13C NMR spectra were measured as mentioned in this paper.
Abstract: The diamagnetic monomer dianion of fluorenone was prepared from 1,2-dimethoxyethane solution of neutral molecule in contact with excess sodium metal at −5 °C for 5 days and its 1H and 13C NMR spectra were measured. The possibility that a pinacolate-type dimer dianion occurs in an equilibrium system was ruled out from reactivity with oxygen, water, deuterium oxide, and reducible aromatics in addition to the analysis of NMR spectra. The charge density distribution of neutral and dianion molecules was estimated by MO calculations. Comparison between experimental and theoretical 13C shifts suggested a strong interaction of sodium ions with carbonyl group. It is presumed that an anormalous diamagnetic ring current in 14π-peripheral structure is responsible for poor correlation between theoretical and observed 1H shifts.
4 citations
TL;DR: The reaction of 17O-labelled 2,4,6-trimethylbenzonitrile N-oxide (4) with dimethylketene gives the dihydro-oxazolone adduct (5b), with isotopic labelling predominantly, but not exclusively, in the carbonyl group as discussed by the authors.
Abstract: The reaction of 17O-labelled 2,4,6-trimethylbenzonitrile N-oxide (4) with dimethylketene gives the dihydro-oxazolone adduct (5b), with isotopic labelling predominantly, but not exclusively, in the carbonyl group. Thermal scrambling of the label is observed, presumably via the zwitterion (6). The dioxazole (8) is proposed as an intermediate in the conversion of (4) into (5b). Alkaline hydrolysis of (5b) gives (10b) by predominant hydroxide attack on the carbonyl group. Attempts to generate the α-lactone (11)(by thermal decomposition of alkali α-halogenoisobutyrates) and add it to benzonitrile and fluorenone anil were unsuccessful. No traces of compounds (5; Ar = Ph, R = Me) or (2; R1= Ph, R = Me) could be detected, suggesting that α-lactones are not intermediates in the formation of adducts of dimethylketene with nitrile oxides and nitrones.
3 citations
Patent•
03 Jul 1987
TL;DR: In this paper, an aromatic ketone (e.g., fluorenone, 1-indanone, 2-tetralone or benzophenone) is reacted with an aniline at 75-200 degC, while removing water condensed by the reaction from the reaction system by azeotropic reaction.
Abstract: PURPOSE:To obtain the titled compound useful for production of heat-resistant polyamide or polyimide resin in high yield, by reacting an aromatic ketone with an aniline while removing water condensed by the reaction from the reaction system CONSTITUTION:An aromatic ketone (eg, fluorenone, 1-indanone, 2-tetralone or benzophenone) is reacted with an aniline at 75-200 degC, preferably 120-150 degC while removing water condensed by the reaction from the reaction system (by azeotropic reaction) to give the aimed compound shown by formula I (X is halogen or lower aliphatic hydrocarbon group; R and R are phenyl or aromatic ketone residue shown by formula II - formula IV bonded to valences of R and R ) 1mol aromatic ketone is preferably reacted with 2-100mol, especially 2-15mol aniline in 1/40-40mol based on 1 aniline of an aromatic solvent (eg, benzene or toluene)
2 citations
Patent•
07 Jan 1987
TL;DR: In this paper, the authors proposed to increase the speed of response and the SN ratio by forming a photoconductive film mainly comprising at least one kind of a fluorenone compound, an alpha-substituted stilbene compound, a diarylmethane compound and a pyrazoline compound.
Abstract: PURPOSE:To increase the speed of response and the SN ratio by forming a photoconductive film mainly comprising at least one kind of a fluorenone compound, an alpha-substituted stilbene compound, a diarylmethane compound, an anthracene compound, a hydrazone compound, a divinyl benzene compound and a pyrazoline compound and at lest one kind of metal-free phthalocyanine or metallic phthalocyanine. CONSTITUTION:A picture-reading equal magnification sensor has a photoelectric conversion element constituted by shaping a discrete electrode, a common electrode and a photoconductive film mainly comprising at lest one kind of a fluorenone compound, an alpha-substituted stilbene compound, a diarylmethane compound, an anthracene compound, a hydrazone compound, a divinyl benzene compound and a pyrazoline compound and at least one kind of metal-free phthalocyanine or metallic phthalocyanine onto an insulating substrate. Accordingly, the speed of response and SN ratio of the long-sized equal magnification sensor can be increased.
1 citations
TL;DR: In this paper, a series of 9-(p -substituted) benzylidene fluorenes (p -nitro, p -cyano, p-chloro, pbromo, P-H, H, P -methyl, pethoxy, m -methyl and p -dimethylamino) was synthesized and the rates of fluorenone production on oxidation with ozone were followed fluorimetrically (apparent rates) and spectrophotometrically (true rates).
1 citations
TL;DR: In this article, the rate constants for quenching of fluorenone fluorescence by substituted benzaldehydes and benzoic acids (substitutents: p-nitro, p-cyano and p-chloro, pbromo and pdimethylamino) are compared with the diffusion rate constant and evidence is presented that, under chemiluminescence mimetic conditions, the quenched leaving moiety in close proximity to the emitter is responsible for most of the observed.
TL;DR: The reaction of 17O-labelled 2,4,6-trimethylbenzonitrile N-oxide (4) with dimethylketene gives the dihydro-oxazolone adduct (5b), with isotopic labelling predominantly, but not exclusively, in the carbonyl group as mentioned in this paper.
Abstract: The reaction of 17O-labelled 2,4,6-trimethylbenzonitrile N-oxide (4) with dimethylketene gives the dihydro-oxazolone adduct (5b), with isotopic labelling predominantly, but not exclusively, in the carbonyl group. Thermal scrambling of the label is observed, presumably via the zwitterion (6). The dioxazole (8) is proposed as an intermediate in the conversion of (4) into (5b). Alkaline hydrolysis of (5b) gives (10b) by predominant hydroxide attack on the carbonyl group. Attempts to generate the α-lactone (11)(by thermal decomposition of alkali α-halogenoisobutyrates) and add it to benzonitrile and fluorenone anil were unsuccessful. No traces of compounds (5; Ar = Ph, R = Me) or (2; R1= Ph, R = Me) could be detected, suggesting that α-lactones are not intermediates in the formation of adducts of dimethylketene with nitrile oxides and nitrones.
TL;DR: In this paper, the deoxygenation of 9-diazofluorene in the presence of epoxides yields fluorenone and an equimolar concentration of the alkene formed from the stereospecific deoxygation of the epoxide.
Abstract: Irradiation of 9-diazofluorene in the presence of epoxides yields fluorenone and an equimolar concentration of the alkene formed from the stereospecific deoxygenation of the epoxide.