Results 251 to 260 of about 323,461 (284)

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
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Optical Properties of Cation-Substituted Zinc Oxide

Inorganic Chemistry, 2008
Zinc oxide (ZnO)-based optoelectronics has emerged as a frontier area in semiconductor research in recent years. In the design of ZnO-based optoelectronic devices, cation-substituted ZnO serves as essential components for the desired device functions.
Young-Il, Kim, Ram, Seshadri
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Cationic substitution in MgSiO3 perovskite

Physics of the Earth and Planetary Interiors, 2003
Abstract Various MgSiO 3 -based compositions were used to investigate the possible cationic substitutions in Earth’s lower mantle perovskite at about 25 GPa and 1750 K, using a multi-anvil press apparatus. Recovered samples were characterized using X-ray diffraction and electron microprobe. Inserted in the silicate perovskite structure were found (i)
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Cationic polymerization initiated by substituted vinyl cations in dichloromethane solution

Die Makromolekulare Chemie, Rapid Communications, 1989
Polymerisation de: ether butylvinyl, p-methyl-styrene, oxyde de cyclohexene, N-vinylcarbazole et ...
Yusuf Yagci, Christian‐Herbert Fischer, Wolfram Schnabel   +2 more
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Photoinitiated Cationic Polymerization of Substituted Vinylcyclopropanes

Macromolecular Chemistry and Physics, 2005
AbstractSummary: The photoinitiated cationic polymerization of 1‐cyclopropyl‐l‐phenyl‐ethylene, 1‐cyclopropyl‐l‐(p‐methoxyphenyl)ethylene and 1‐cyclopropyl‐l‐(p‐fluorophenyl)ethylene at ambient temperatures in bulk and in solution was investigated using (η5‐2,4‐cyclopentadiene‐l‐yl)[l,2,3,4,5,6‐η] (l‐(methylethyl) benzene)iron(I) hexafluorophosphate ...
Aniss Abdo Al‐Doaiss, Wolfgang Günther, Elisabeth Klemm, Dietmar Stadermann   +3 more
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Selective Cation Exchange in Substituted Tobermorites

Journal of the American Ceramic Society, 1989
Selective cation exchange in tobermorites with three levels of Al 3+ and Na + substitution for Si 4+ has been investigated. The cation exchange selectivity for a tobermorite with 2 mol% Al 3+
Sridhar Komarneni, Masamichi Tsuji
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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
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Aluminum‐Substituted Gyrolite as Cation Exchanger

Journal of the American Ceramic Society, 1990
A successful Al‐substituted gyrolite has been hydrothermally synthesized at 220°C under saturated steam pressure, and its cation exchange characteristics for K + and Cs + ions have been investigated. Al‐substituted gyrolite took up K
Michihiro Miyake, Masaki Iwaya, Takashi Suzuki, Hiroyuki Kakehi, Takeshi Mitsuda   +4 more
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ChemInform Abstract: SILICON‐SUBSTITUTED CYCLOPROPYLCARBINYL CATIONS

Chemischer Informationsdienst, 1983
AbstractAus den S‐ilyl‐alkinen (I) entstehen in Gegenwart von Ni‐acetylacetonat mit Methylgrignardreagenz und Trimethylaluminium die Silylolefine (II), die mit Ethylenoxid (III) zu den Alkoholen (IV) reagieren und dann in die Tosylate (V) umgewandelt werden.
B. B. SNIDER, M. KARRAS
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Al-substituted tobermorite: shows cation exchange

Cement and Concrete Research, 1982
Abstract It has been found that the tobermorite family--fundamental to cement chemistry can exhibit base exchange behavior. Several Al-substituted tobermorites were synthesized and these 11A type tobermorites were discovered to have cation exchange as well as selective cation adsorption properties. For example, Al-substituted tobermorite (synthesized
S. Komarneri, D.M. Roy, Rustum Roy
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