2346-63-6Relevant academic research and scientific papers
Determination of the Lifetime of the Second Excited Triplet State of Anthracenes
Bohne, C.,Kennedy, S. R.,Boch, R.,Negri, F.,Orlandi, G.,et al.
, p. 10300 - 10306 (1991)
The lifetimes of the T2 states of several substituted anthracenes have been determined using competitive quenching techniques in combination with laser flash photolysis.Thus, Stern-Volmer quenching of 1,3-octadiene yields different slopes depending on whether the triplet or the fluorescence yield are monitored.The difference, which can be treated quantitatively, is the result of T2 quenching by the diene.Typical T2 lifetimes are ca. 23, 11, and 3 ps for 9,10-dichloroanthracene, anthracene, and 1-methylanthracene, respectively.It is shown that consideration of time-dependent diffusional quenching is essential and that discrepancies with earlier studies may largely reflect the contribution from this process, as well as S1 quenching by typical T2 quenchers.Theoretical calculations suggest that interactions of T2 with the nearby T3 state may play a key role in determining the rate of internal conversion to T1.Calculations have been carried out for the methyl derivatives; these, while consistent with experiments, tend to reflect the limitations of current theory in the interpretation of substituent effects.
Ultrasound-promoted Friedel-Crafts acylation of arenes and cyclic anhydrides catalyzed by ionic liquid of [bmim]Br/AlCl3
Fekri, Leila Zare,Nikpassand, Mohammad
, p. 1825 - 1829 (2015/01/09)
A simple and efficient method of Friedel-Crafts acylation of arenes with succinic anhydride, phthalic anhydride and glutaric anhydride under the action of 1-butyl-3-ethylimidazolium ([bmim]Br/AlCl3 ([bmim]+) cation (ionic liquid) and ultrasound irradiation is presented. Thy purity of products was tested by GC-MS and their structures evaluated by IR and 1H NMR spectroscopy.
Palladium-catalyzed chemoselective decarboxylative ortho acylation of benzoic acids with α-oxocarboxylic acids
Miao, Jinmin,Ge, Haibo
supporting information, p. 2930 - 2933 (2013/07/26)
Palladium-catalyzed chemoselective decarboxylative cross coupling of benzoic acids with α-oxocarboxylic acids was realized via an arene sp 2 C-H functionalization process. This work represents the first example of transition-metal-catalyzed cro
ISOQUINOLINE COMPOUNDS AND METHODS FOR TREATING HIV
-
Page/Page column 183-184, (2012/08/08)
Provided are compounds and pharmaceutically acceptable salts thereof, their pharmaceutical compositions, their methods of preparation, and their use for treating viral infections mediated by a member of the retrovirus family of viruses such as the Human Immunodeficiency Virus (HIV).
An efficient one-pot synthesis of pyridazinones and phthalazinones using HY-zeolite
Zare, Leila,Mahmoodi, Nosratollah,Yahyazadeh, Asieh,Mamaghani, Manouchehr,Tabatabaeian, Khalil
experimental part, p. 864 - 867 (2011/09/16)
Figure represented. The first one-pot synthesis of pyridazinones and phthalazinones from arenes, cyclic anhydrides, and ArNHNH2 in the presence of efficient recyclable heterogeneous catalyst, HY-zeolite, in high yield and short reaction time is reported.
INVESTIGATION OF THE COMPOSITION OF PETROLEUM ANTHRACENE HYDROCARBONS
Ivanov, V. I.,Golovko, A. K.
, p. 504 - 512 (2007/10/02)
The optimum conditions of adduct formation with maleic anhydride for the isolation of ca. 100percent anthracene hydrocarbons from a mixture with phenanthrenes and other compounds are set out.Gas-liquid chromatography has been used to study the individual composition of anthracene and C1-C3 anthracenes isolated by the method proposed from concentrates of triaromatic hydrocarbons of crude oils from the Okha, Katangli (Sakhalin) and Dorokhovsk (Urals-Volga) fields.With the aid of the individual compounds synthesized, for the first time 2-ethylanthracene and 1,3- and 2,3-dimethylanthracene have been identified in crude oils, and the retention indices have also been calculated for certain C2- and C3-substituted anthracene hydrocarbons for chromatographic phase SE-54.
