Results 251 to 260 of about 651,736 (310)

Trisilyl‐Substituted Vinyl Cations

Chemistry – A European Journal, 2009
AbstractA series of β,β‐disilyl‐substituted vinyl cations were prepared by intramolecular addition of transient silylium ions to CC triple bonds. The vinyl cations were isolated from hydrocarbon solutions as tetrakis(pentafluorophenyl) borates at room temperature.
Andrea, Klaer, Yvonne, Syha, Hamid Reza, Nasiri, Thomas, Müller   +3 more
openaire   +2 more sources

Cation substitutions in BaFe12O19

Journal of Physics and Chemistry of Solids, 1958
Abstract The variation in magnetic intensity of BaFe 12 O 19 was studied as a function of the substitution of ions such as Al III , Ga III , Cr III , and Zn II for Fe III . All the substituted ions, with the exception of Cr III , were nonmagnetic.
A.H. Mones, E. Banks
openaire   +1 more source

Geometry and Energy of Substituted Phenyl Cations

The Journal of Organic Chemistry, 2007
The geometry and the energy of a number of substituted phenyl cations have been calculated for both spin states at the UB3LYP/6-31G(d) level (o-, m-, p-Me, OMe, NH(2), CN, NO(2)) or at the UB3LYP/6-311++G(2d,p) level (o-, m-, p-SiMe(3), SMe). The geometric differences were assessed by means of a self-organizing neural network.
LAZZARONI, SIMONE, DONDI, DANIELE, FAGNONI, MAURIZIO, ALBINI, ANGELO   +3 more
openaire   +2 more sources

Electrophilic phenoxy-substituted phosphonium cations

Dalton Transactions, 2016
A family of electrophilic phenoxy-substituted phosphonium salts [(RO)P(C 6 F 5 ) 3 ][B(C 6 F 5 ) 4
James H W, LaFortune, Timothy C, Johnstone, Manuel, Pérez, Daniel, Winkelhaus, Vitali, Podgorny, Douglas W, Stephan   +5 more
openaire   +2 more sources

Anionic and cationic substitution in ZnO

Progress in Solid State Chemistry, 2009
In this contribution we review the impact of anionic and cationic substitutions on the electronic properties of bulk ZnO crystals, thin films and ZnO powders. p-type doping is discussed with focus on the anionic substitution of oxygen by nitrogen or phosphorous. n-type doping is exemplarily reviewed for substitution of Zn by group III elements.
Wenckstern, H., Schmidt, H., Brandt, M., Lajn, A., Pickenhain, R., Lorenz, M., Grundmann, M., Hofmann, D., Polity, A., Meyer, B. K., Saal, H., Binnewies, M., Börger, A., Becker, K.-D., Tikhomirov, V. A., Jug, K.   +15 more
openaire   +2 more sources

Cationic substitution in tricalcium aluminate

Cement and Concrete Research, 2003
Tricalcium aluminate in normal Portland cement clinkers is generally modified in chemical composition by cationic substitutions. In this study, cubic and orthorhombic crystals of tricalcium aluminate doped with sodium oxide, iron oxide and silicon dioxide were prepared and examined using an electron probe microanalyzer. The cationic ratios based on six
Koichiro Fukuda, Shinji Inoue, Hideto Yoshida   +2 more
openaire   +1 more source

Properties of Excited Radical Cations of Substituted Oligothiophenes

The Journal of Physical Chemistry A, 2008
Excited-state properties of radical cations of substituted oligothiophenes ( nT (*+), n denotes the number of thiophene rings, n = 3, 4, 5) in solution were investigated by using various laser flash photolysis techniques including two-color two-laser flash photolysis.
Shingo, Samori, Mamoru, Fujitsuka, Tetsuro, Majima   +2 more
openaire   +2 more sources

Improved Synthesis of Cationic Pyridinium‐Substituted Indolizines.

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Martine Demeunynck, Bianca Furdui, Rodica Dinica, Ioan Druta   +3 more
openaire   +1 more source

Molecular Structure of a Cyclopropyl Substituted Vinyl Cation

Journal of the American Chemical Society, 2008
The experimentally determined molecular structure of vinyl cation 1 provides clear evidence for the occurrence of extended sigma-conjugation involving the cyclopropyl ring and the beta-C-Si bonds.
Andrea, Klaer, Wolfgang, Saak, Detlev, Haase, Thomas, Müller   +3 more
openaire   +2 more sources

Electrophilicities of Symmetrically Substituted 1,3-Diarylallyl Cations

The Journal of Organic Chemistry, 2011
Kinetics of the reactions of nine symmetrically substituted 1,3-diarylallyl cations with different nucleophiles were studied photometrically in dichloromethane, acetonitrile, and DMSO solutions. The second-order rate constants k(2) were found to follow the correlation log k(2) = s(N)(N + E).
Konstantin, Troshin, Claus, Schindele, Herbert, Mayr   +2 more
openaire   +2 more sources