Results 171 to 180 of about 19,687 (245)

Photosynthese des Fluorens, des Reten‐fluorens und des 1.2‐Benzo‐fluorens

Justus Liebigs Annalen der Chemie, 1958
AbstractDie Darstellung einiger o‐Chinondiazide mit dem Ringsystem des Phenanthrens und Chrysens und deren Lichtreaktion werden beschrieben.
Oskar Süs, Hartmut Steppan, Roland Dietrich   +2 more
openaire   +1 more source

Noninnocent Azo-Aromatic Cobalt(II)-Catalyzed sp3 C-H Alkylation of Fluorenes with Alcohols.

Journal of Organic Chemistry
Herein, employing well-defined redox noninnocent cobalt(II) complexes an efficient sp3 C-H alkylation of fluorenes using alcohols as alkylating agents to result in alkylated fluorenes is reported.
Kamal, S. Samanta
semanticscholar   +1 more source

TFA-Promoted Cascade Sulfonylation/Rearrangement/Cyclization of 1,5-Diynols and Sodium Sulfinates to Construct Sulfonylated Benzo[b]fluorenes.

Journal of Organic Chemistry
A novel conversion of 1,5-diynols into sulfonylated benzo[b]fluorenes is reported by a TFA-promoted cascade cyclization with sodium sulfinates under mild conditions.
Shimin Jiang, Meng Liang, Jiang Bai, Ruchun Yang, Xi Chen, Haiyang Huang, Haixin Ding, M. Luo, Xian‐Rong Song, Qiang Xiao   +9 more
semanticscholar   +1 more source

Bis-(Fluorene)-Embedded Hexaphyrins

The Journal of Organic Chemistry, 2022
The polyaromatic hydrocarbon containing expanded porphyrins, bis-(fluorene)-embedded hexaphyrins, were synthesized by condensing fluorene-based tripyrrane with pentafluorobenzaldehyde in CH2Cl2 in the presence of 1 equiv of BF3·OEt2 under an inert atmosphere followed by oxidation with DDQ in open air at room temperature. The reaction worked only when 1
Bharti Yadav, Mangalampalli Ravikanth
openaire   +2 more sources

Enynone-enabled migratory insertion and Schmittel cyclization cascade for the synthesis of furan-fused fluorenes

Organic Chemistry Frontiers, 2019
A new method for the synthesis of furan-/benzo-fused fluorenes through copper(i)-catalyzed coupling of conjugated enynones or α-diazocarbonyl compounds with dialkynylbenzenes has been developed.
He Zhang, Tongxiang Cao, Hejiang Luo, Lian-yong Chen, Shifa Zhu   +4 more
semanticscholar   +1 more source

Vapor pressure measurements on fluorene and methyl-fluorenes

Fluid Phase Equilibria, 2004
Vapor pressures, molar enthalpies of sublimation, and molar enthalpies of vaporization of fluorene, 9-methyl-fluorene, and 1-methyl-fluorene have been determined by the transpiration method. Results were tested for internal consistency and compared with available literature data.
openaire   +1 more source

Direct access to benzo[b]fluorenes via a gold-catalysed A3-coupling strategy

Organic Chemistry Frontiers, 2019
A one-pot combination of gold catalysis and thermal cyclization provides a fast convergent route to benzo[b]fluorenes.
D. Lustosa, P. Cieslik, D. Hartmann, Tim Bruckhoff, M. Rudolph, F. Rominger, A. Hashmi   +6 more
semanticscholar   +1 more source

Anisotropic electron mobility in fluorene-PPV and fluorene-MEH-PPV

Molecular Physics, 2016
ABSTRACTPolyfluorene copolymers are attractive semiconductor materials, in particular for applications in the organic electronics field. They are versatile to be chemically modified and allow a tuning of the emission to cover the entire visible spectrum.
Carlos E. T. Magalhães, Marcio M. da Silva, Ranylson M. L. Savedra, Melissa F. Siqueira   +3 more
openaire   +1 more source

Mutagenicity of methylated fluorenes and benzofluorenes

Mutation Research Letters, 1981
Methylated fluorenes were assayed for mutagenic activity towards Salmonella typhimurium TA98 and TA100. None of these methylfluorenes were mutagenic in the absence of metabolic activation. In the presence of 9000 X g supernatant from Aroclor-induced rats, 9-methylfluorene and 1,9-dimethylfluorene were active towards TA98 and TA100.
E J, Lavoie, L, Tulley, V, Bedenko, D, Hoffmann   +3 more
openaire   +2 more sources

Novel Soluble Fluorene–Thienothiadiazole and Fluorene–Carbazole Copolymers for Optoelectronics

Macromolecular Symposia, 2010
AbstractSummary: Optical, photophysical, electrochemical and photoelectrical properties of novel soluble low‐bandgap fluorene – thienothiadiazole based copolymers (CHTF and CDTF) and luminescent fluorene – carbazole copolymers, (CFCzE and CFCZA) were studied.
Věra Cimrová, Ivan Kmínek, Drahomír Výprachtický   +2 more
openaire   +1 more source