Showing papers on "Fluorenone published in 1989"
TL;DR: In this article, the S 1 and T 1 excited states of several aromatic ketones (benzophenone, xanthone, fluorenone, thioxanthone and acridone) are quenched by methyl methacrylate (MMA).
Abstract: The S 1 and T 1 excited states of several aromatic ketones (benzophenone, xanthone, fluorenone, thioxanthone, acridone, N -methylacridone) are quenched by methyl methacrylate (MMA). The rate constants of T 1 quenching ( k 3 q ) measured by means of flash experiments show a linear log k 3 q vs. E T relationship. Results of kinetic treatment agree with the formation of 1,4-diradicals which decompose mainly into the starting materials, whilst some initiate the polymerization of MMA. Data of the kinetic experiments of polymer formation (monomer exponents, light intensity exponents) accord with such a mechanism. The polymers obtained contain the corresponding ketone moiety, identified by absorption and fluorescence measurements.
43 citations
Journal Article•
TL;DR: L'oxydation d'alcools and de groupes methylenes en position benzylique, allylique ou propargylique donne majoritairement les cetones correspondantes as discussed by the authors.
Abstract: L'oxydation d'alcools et de groupes methylenes en position benzylique, allylique ou propargylique donne majoritairement les cetones correspondantes
10 citations
9 citations
TL;DR: In this article, the transient spectra of benzophenone, xanthone, and fluorenone in neat diethylaniline were measured by nanosecond laser photolysis at 77 K.
6 citations
Patent•
22 Nov 1989
TL;DR: In this paper, a bisazo dye was obtained by reacting 2,7-dinitro-9-fluorenone with bromine in sulfuric acid in the presence of silver sulfate.
Abstract: PURPOSE:To obtain the subject compound useful as a raw material for a bisazo dye which is a charge-generation substance for highly sensitive photo-sensitive material for electrophotography, in one step and high yield, by reacting 2,7- dinitro-9-fluorenone with bromine in sulfuric acid in the presence of silver sulfate. CONSTITUTION:2,7-Dinitro-9-fluorenone is dissolved in sulfuric acid, heated to 50-70 deg.C, added with silver sulfate and bromine and reacted with each other at 100-120 deg.C for 8-16hr to obtain 4-bromo-2,7-dinitro-9-fluorenone. The amounts of silver sulfate and bromine are 0.5-1.5mol and 1.0-2.0mol per 1mol of 2,7- dinitro-9-fluorenone. The by-production of 4,5-dibromo-2,7-dinitro-9-fluorenone can be suppressed by the use of silver sulfate as a catalyst.
1 citations
TL;DR: A seven-step synthesis of (R,S)-6H-6-[2-(dimethylamino) ethoxycarbonyl]-[6-14C]dibenzo[b,d]pyran was reported in this paper.
Abstract: A seven steps synthesis of (R,S)-6H-6-[2-(dimethylamino) ethoxycarbonyl]-[6-14C]dibenzo[b,d]pyran.HCl [14C]FCE 20696 employing 9-[9-14C]fluorenone as labelled starting material is reported. The final product [14C] FCE 20696 was obtained in an overall radiochemical yield of 31%, 97% radiochemically pure and with a specific radioactivity of 115 MBq/mmol.