Showing papers on "Fluorenone published in 1984"
Patent•
28 Sep 1984TL;DR: In this article, a high capacity macroreticulate polymer comprising a polymer backbone having a plurality of pendant functional groups or mixtures of functional groups having the general formula: STR1## where Ar is an aromatic hydrocarbon radical containing from one to three rings.
Abstract: Lewis acid and oxidant impurities are removed from inert fluids by contacting with a high capacity macroreticulate polymer comprising a macroreticulate polymer backbone having a plurality of pendant functional groups or mixtures of functional groups having the general formula: ##STR1## where Ar is an aromatic hydrocarbon radical containing from one to three rings; R 1 and R 2 are the same or different and are selected from the group consisting of hydrogen, alkyl hydrocarbon radicals, methylene-bridged benzophenone radicals, salts of methylene-bridged benzophenone, methylene-bridged fluorenone radicals and salts of methylene-bridged fluorenone; and M is selected from the group consisting of lithium, potassium, sodium, alkyl magnesium, and alkyl zinc.
35 citations
TL;DR: In this paper, the η6-xanthone-η5-cyclopentadienyliron cation (III) was used as a reactant in the synthesis of new complexes via reactions with a number of reagents.
20 citations
Journal Article•
TL;DR: On etudie les reactions de l'acenaphtenyl-1 diisobutyl-Al, avec des cetones (acetone, propiophenone, fluorenone, etc) and des chlorures d'acyle as discussed by the authors.
Abstract: On etudie les reactions de l'acenaphtenyl-1 diisobutyl-Al, avec des cetones (acetone, propiophenone, fluorenone, etc) et des chlorures d'acyle
18 citations
TL;DR: In this article, the C-18 backbone of castor oil fragments, thermally to C-11 + C-7 by a π2s+ σ2s + o2s process and with hot alkali to c-10 + c-8 via unique sequence involving a primary reaction which is associated with three different types of redox systems as well as with uncoupled oxidation, the overall change amounting to a milieu of hydride transfer, π -migration, retro-Michael, retroaldol, Meerwein-P
8 citations
TL;DR: In this article, 1H and 13C CIDNP effects in the reactions of Na and Li salts of ketyls and dianions derived from benzophenone and fluorenone with acetic anhydride in tetrahydrofuran and dimethoxyethane were investigated.
7 citations
TL;DR: Triplepotential-step chronoamperometry (TPSCA) has been used to identify either the previously disputed or the unidentified anodic process that arises in the electroreduction of diazodiphenylmethane, diethyl diazomalonate, and fluorenone hydrazone as mentioned in this paper.
6 citations
TL;DR: In this article, the superoxide anion was used to abstract a proton from (fluorene)tricarbonylchromium and then reduced to its anion in an inert atmosphere, prior to the introduction of oxygen.
6 citations
TL;DR: Fluorenethione S-tosylimide reacted with Grignard reagents to afford both the thiophilic and carbophilic products depending on the solvent used.
Abstract: Fluorenethione S-tosylimide reacted with Grignard reagents to afford both the thiophilic and carbophilic products depending on the solvent used.
6 citations
TL;DR: Synthese de peresters de t-butyle a base d'hydrocarbures aromatiques. Photo-amorcage de la polymerisation du methacrylate de methyle et du styrene as discussed by the authors.
Abstract: Synthese de peresters de t-butyle a base d'hydrocarbures aromatiques. Photo-amorcage de la polymerisation du methacrylate de methyle et du styrene
5 citations
TL;DR: In this paper, it is shown that the instantaneously formed FIN2+˙ is consumed in a rapid process which is second order with respect to the cation radical and has a rate constant of 1.9 × 108 l mol −1 s−1; it is suggested that this process is cationradical dimerisation.
Abstract: The decomposition of 9-diazofluorene (FIN2) brought about at a platinum anode or by chemical oxidants, Cu(BF4)2 or (p-BrC6H4)3N+˙SbCl6–, in CH3CN solution leads to formation of mixtures of bifluorenylidene and fluorenone azine in high yield. The reactions have been studied kinetically by conventional means and using the transient electrochemical techniques derivative linear sweep voltammetry (I.s.v.) and derivative cyclic voltammetry (d.c.v.). Constant-current electrolysis of FIN2 shows the characteristics of a chain process. The chemical oxidants give rise to a rate law –d[FIN2]/dtk[FIN2][oxidant] above a critical oxidant level, and the value of k is the same for both oxidants, even though their oxidation potentials are substantially different. It is inferred that the process studied is the chain propagation step in which the chain carrier reacts with a molecule of FIN2. Under the conditions of I.s.v. and d.c.v. experiments, it is shown that the instantaneously formed FIN2+˙ is consumed in a rapid process which is second order with respect to the cation radical and has a rate constant of 1.9 × 108 l mol –1 s–1; it is suggested that this process is cation radical dimerisation. Since the product of this step rapidly yields bifluorenylidene, it is argued that the slower macroscopic chain reaction do not involve dimerisation, but rather that FIN2+˙ rapidly attacks a further FIN2 molecule to generate the chain carrier which must have a lower oxidation potential than FIN2+˙. Possible structures for the chain carrier are considered in the light of earlier e.s.r. evidence for a radical intermediate.
3 citations
TL;DR: In this article, the one-step electrosynthesis of tetrahydrofuran derivatives was achieved by electrogenerating in N,N -dimethylformamide and at a mercury pool cathode, radical-anions of benzophenone or fluorenone in the presence of an equivalent of 1,3-dibromopropane 1 or 1,4-dimethyl-formamide 2.
TL;DR: In this paper, the authors investigated the kinetics of the electron transfer chain catalysis of the decomposition of 9-diazofluorene (FIN2) in CH3CN solution.
Abstract: The method of constant-current electrolysis (c.c.e.) at a platinum cathode has been used to investigate the kinetics of the electron transfer chain catalysis of the decomposition of 9-diazofluorene (FIN2) in CH3CN solution. Equations have been derived for various possible kinetic forms of both chain propagation and termination, and comparison with observation indicates that the chain carrier reacts with a molecule of FIN2 to propagate the chain and reacts with the solvent, or other additive such as oxygen or diethyl malonate, to terminate the chain. Interruption of the current in the experiments (i.c.c.e.) leads to a different set of equations from which it is possible to evaluate separately the rate constants for propagation and termination. The identity of the chain carrier is discussed. It is established that this is unlikely to be the diazolalkane anion radical, FIN2–˙, as previously thought. Anion-radicals derived from the product fluorenone azine are the likeliest candidates under the reaction conditions used.
TL;DR: Sterically hindered α-glycols, obtained from electrochemical hydrodimerization of polycyclic ketones, were studied by 1H and 13C NMR as discussed by the authors.
Abstract: Sterically hindered α-glycols, obtained from electrochemical hydrodimerization of polycyclic ketones (indanone, tetralone, chromanone, flavanone, xanthone and fluorenone), were studied by 1H and 13C NMR. Evidence of conformational hindrance was deduced from the 1H spectra; meso or racemic configurations and the conformational stereochemistry of these molecules in solution were assigned.