1,6,7,10-Tetramethylfluoranthene: Synthesis and structure of a twisted polynuclear aromatic hydrocarbon.
作者:Allen Borchard、Kenneth Hardcastle、Peter Gantzel、Jay S. Siegella
DOI:10.1016/s0040-4039(00)60565-8
日期:1993.1
The structure and synthesis of the overcrowded polynucleararomatic 1, 6, 7, 10-tetramethylfluoranthene, 1, is presented. The structures of 1 and 11 have been determined by X-ray diffraction to be twisted into conformations of approximately C2 symmetry due to the buttressing of the flanking methyl groups. Semi-empirical calculations (AM1) on 1 find two minima, twist and fold; the twist is of lower
Herein we report general methods allowing the synthesis of various perfluoroalkylated corannulenes with a specific substitution pattern. Variable temperature NMR spectroscopic investigations revealed dynamic behavior which was analyzed by line shape analysis. The activation parameters of these dynamic processes were determined. For a tetrasubstituted compound it was possible to observe through space
Synthesis of Corannulene and Alkyl Derivatives of Corannulene
作者:T. Jon Seiders、Eric L. Elliott、Gunther H. Grube、Jay S. Siegel
DOI:10.1021/ja991310o
日期:1999.9.1
Synthesis of corannulene and alkyl corannulene derivatives has been accomplished using solution-phase chemistry. The key step in the synthesis is the coupling of benzylic bromides of 1,6,7,10-tetraalkylfluoranthene derivatives by low-valent titanium to construct the corannulene nucleus. The use of low-valent titanium represents a viable alternative to flash vacuumpyrolysis methods previously developed
Synthesis and properties of 1,6,7,12,13,18,19,24-octamethylacenaphthyleno[b,l]tetraphenylene
作者:Eric L. Elliott、Akihiro Orita、Daiki Hasegawa、Peter Gantzel、Junzo Otera、Jay S. Siegel
DOI:10.1039/b416820h
日期:——
The X-ray crystalstructure and photophysical properties of 1,6,7,12,13,18,19,24-octamethylacenaphthyleno[b,l]tetraphenylene, which has been synthesized via a Diels-Alder reaction of 5,6,11,12-tetradehydrodibenzo[a,e]cyclooctene and 6,7-dihydro-6-hydroxy-7,9-dimethyl-8H-cyclopenta[a]acenaphthylene-8-one, are reported.
Novel Twin Corannulene: Synthesis and Crystal Structure Determination of a Dicorannulenobarrelene Dicarboxylate
作者:Andrzej Sygula、Renata Sygula、Arkady Ellern、Peter W. Rabideau
DOI:10.1021/ol034692i
日期:2003.7.1
[reaction: see text] The dicorannulenobarrelene 1 was synthesized with the final step achieved by a nickel-mediated fourfold intramolecular coupling of dibromomethyl with bromomethyl groups. Low-temperature (1)H NMR spectra of 1 show a presence of three conformers with approximate populations of 0.82:0.13:0.05, in good agreement with theoretical predictions. In the crystal, 1 incorporates two CCl(4)