Non-Pyrolytic Syntheses of Buckybowls: Corannulene, Cyclopentacorannulene, and a Semibuckminsterfullerene
作者:Andrzej Sygula、Peter W. Rabideau
DOI:10.1021/ja991169j
日期:1999.9.1
Corannulene (1), cyclopentacorannulene (2), and a C30H12 semibuckminsterfullerene (3) have been prepared by non-pyrolytic methods employing bromomethyl/dibromomethyl and/or dibromomethyl/dibromomethyl coupling with low-valent titanium or vanadium. Reductive coupling of tetrakis(dibromomethyl)fluoranthene (8) with vanadium(III) chloride and lithium aluminum hydride affords corannulene in 70−75% yield
"Locking" the bowl-shaped geometry of corannulene: cyclopentacorannulene
作者:Atteye H. Abdourazak、Andrzej Sygula、Peter W. Rabideau
DOI:10.1021/ja00060a073
日期:1993.4
The discovery that buckminsterfullerene, C[sub 60], is a stable molecule due to geodesic and electronic properties inherent in the truncated icosahedral cage structure has generated a renewed interest in hydrocarbons with curved surfaces. The carbonframework of corannulene, which can be considered to represent the polar cap of buckminsterfullerene, is surprisingly flexible. In spite of its substantial
Synthesis and Quantum Mechanical Structure of <i>sym-</i>Pentamethylcorannulene and Decamethylcorannulene
作者:T. Jon Seiders、Kim K. Baldridge、Eric L. Elliott、Gunther H. Grube、Jay S. Siegel
DOI:10.1021/ja991486q
日期:1999.8.1
Cyclopentacorannulene: π-Facial Stereoselective Deuterogenation and Determination of the Bowl-to-Bowl Inversion Barrier for a Constrained Buckybowl
作者:Andrzej Sygula、Atteye H. Abdourazak、Peter W. Rabideau
DOI:10.1021/ja9521987
日期:1996.1.1
Attachment of an ethane or ethylene unit to the rim of corannulene produced relatively rigid bowls of dihydrocyclopenta- and cyclopentacorannulene, respectively. In contrast to the parent corannulenes, their inversion barriers are too high to be determined by the NMR coalescence methods. Due to the significant curvature of cyclopentacorannulene, deuterogenation is pi-facial specific; both heterogeneous and homogeneous catalysis lead exclusively to exo-dideuteriocyclopentacorannulene 2a. Equilibration of the endo- and exo-isotopomers allowed the determination of Delta G(double dagger) at 27.61-27.67 kcal/mol over the temperature range 52.1-99.3 degrees C and the estimation of Delta H-double dagger (27.3 +/- 0.7 kcal/mol) and Delta S-double dagger (-1.1 +/- 0.2 eu) for the bowl-to-bowl inversion. The inversion barrier calculated at the HF/6-31G*//3-21G level (25.9 kcal/mol) compares well with the experimental result.
Structure/Energy Correlation of Bowl Depth and Inversion Barrier in Corannulene Derivatives: Combined Experimental and Quantum Mechanical Analysis
作者:T. Jon Seiders、Kim K. Baldridge、Gunther H. Grube、Jay S. Siegel
DOI:10.1021/ja0019981
日期:2001.1.1
correlating the structure (bowl depth) and the energy of bowl inversion. Substituents placed in the peri positions are repulsive and flatten the bowl, thus causing a decrease in the bowl inversionbarrier. Conversely, annelation across the peri positions causes a deepening of the bowl, thus an increase in the bowl inversionbarrier. Barriers between 8.7 and 17.3 kcal/mol have been measured, and their