Stereoselective Cyclotrimerization of Enantiopure Iodonorbornenes Catalyzed by Pd Nanoclusters for <i>C</i><sub>3</sub> or <i>C</i><sub>3<i>v</i></sub> Symmetric <i>syn</i>-Tris(norborneno)benzenes
作者:Shuhei Higashibayashi、A. F. G. Masud Reza、Hidehiro Sakurai
DOI:10.1021/jo100710h
日期:2010.7.2
C3 or C3vsymmetricenantiopuresyn-tris(norborneno)benzenes with various functional groups were synthesized through Pd-catalyzed cyclotrimerization of enantiopureiodonorbornenes. The generality of Pd-catalyzed cyclotrimerization for syn-tris(norborneno)benzenes were well-demonstrated.
Novel Synthesis and Structures of Tris-Annelated Benzene Donors for the Electron-Density Elucidation of the Classical Mills−Nixon Effect
作者:R. Rathore、S. V. Lindeman、A. S. Kumar、J. K. Kochi
DOI:10.1021/ja980805v
日期:1998.6.1
alternation relevant to the Mills−Nixoneffect. Most importantly, the efficient synthesis of 1s crystals of extraordinary quality allows us (for the first time) to make precise electron-density measurements of the “banana-type” distortion and the ellipticity (π-character) of the various aromatic C−C bondssufficient to identify the electronic origin of the classical Mills−Nixoneffect. The unique electron-donor
Synthesis and reactions of 2-lithio-3-chlorobicyclo[2.2.1]hept-2-ene. Generation of the trimer of bicyclo[2.2.1]hept-2-yne
作者:Paul G. Gassman、Irene Gennick
DOI:10.1021/ja00542a041
日期:1980.10
GASSMAN P. G.; GENNICK I., J. AMER. CHEM. SOC., 1980, 102, NO 22, 6863-6864
作者:GASSMAN P. G.、 GENNICK I.
DOI:——
日期:——
Observation of slowed rotation about the η<sup>6</sup>-arene–chromium bond in the tripodal chromium complexes of the trimers of bicyclo[2.2.1]hept-2-yne: intramolecular rotational barriers in organometallic complexes and their correlation with internal non-bonding interactions and structural changes
作者:Geoffrey Hunter、Regina Louise MacKay、Peter Kremminger、Walter Weissensteiner
DOI:10.1039/dt9910003349
日期:——
hexaethylbenzene in its metal complexes. Both 1 and 2 complex to chromium as arenes rather than as cyclohexatrienes. The variable-temperature 75.5 MHz 13C-1H} NMR spectra of a series of complexes [Cr(η6-arene)(CO)2L](L = CO, CS, or PPh3) have been observed and restricted rotation about the chromium–arene bond detected at very low temperatures only for the tricarbonylcomplex of 2 and the dicarbonyl(triphenylphosphine)