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1.
Zusammenfassung Konduktometrische und potentiometrische Titrationen zeigen, daß TiCl4 in POCl3 sowohl 2 Chloridionen aufnehmen als auch ein Chloridion abgeben kann. Die Existenz der Koordinationsformen [TiCl6]2–, [TiCl5]–
solv, (TiCl4)solv und [TiCl3]+
solv läßt sich nachweisen. Das Verhältnis von Donor-und Akzeptorstärke ist von der Konzentration abhängig; in verd. Lösungen ist TiCl4 vor allem Donor, in konz. Lösungen Akzeptor.Mit 6 AbbildungenZugleich 21. Mitt. der Reihe: Das Solvosystem Phosphoroxychlorid.20. Mitt.:M. Baaz, V. Gutmann undL. Hübner, J. Inorg. Nucl. Chem., im Druck. 相似文献
2.
Talaat Ibrahim El‐Emary 《中国化学会会志》2006,53(2):391-401
New derivatives of pyrazolo[3,4‐b]pyrazine and related heterocycles were prepared starting from 6‐amino‐3‐methyl‐1‐phenyl‐1H‐pyrazolo[3,4‐b]pyrazine‐5‐carbonitrile ( 2 ) and using the key intermediates 4 , 5 , 6 , 14 , 15 and 16 . Some of the prepared compounds were evaluated for their antifungal and antibacterial activities. 相似文献
3.
4.
Wael M. Badawy Octavian G. Duliu Marina V. Frontasyeva Hussein El Samman Arnaud Faanhof 《Isotopes in environmental and health studies》2018,54(5):535-547
The activity concentrations of natural 40K, 232Th, and 238U in 89 soil and 84 sediment samples collected over the entire Egyptian Nile River basin including the Nile delta are reported based on the results of epithermal neutron activation analysis. The average activity concentrations of 40K, 232Th, and 238U equal to 15.3?±?6.6, 15.6?±?11.1 and 220?±?31 Bq/kg, respectively, are significantly lower than those reported for the Upper Continental Crust, World Average Sediments as well as World Average Soils, suggesting the presence of a considerable portion of mafic material, most probably originating from the Ethiopian High Plateau. Their average activity concentrations are statistically the same in soil and sediments, indicating that the Nile sediments and soil material are of the same origin. The main goal of this study was not only to estimate the radiological hazards but also to show the influence of sedimentary material transportable by the Blue Nile from the Ethiopian High Plateau. The different hazard indices like the radium equivalent, gamma index, external hazard as well as the internal hazard show a low radiological exposure either on direct contact or if local mud bricks are used in the construction of dwellings. 相似文献
5.
Ahmed Ghoniem Agha Iqbal Ali Mohammed Al-Salem Wael Khallouli 《The Journal of the Operational Research Society》2017,68(10):1183-1194
The FIFA World Cup, comprising sixty-four matches spanning an entire month, has, in recent years, been attended by about three million spectators of which over half a million are visitors requiring lodging. Planning lodging capacity for an event of this magnitude is necessary for host nations where pre-existing infrastructures are either inadequate or lacking. This paper develops an optimization analytics framework that sequentially employs two integer programming models for foreign spectator analysis and the consequent lodging requirements. The framework is applied to assess the preparedness of lodging infrastructure in Qatar for FIFA 2022. 相似文献
6.
Qian Wang Assoc. Prof. Fuhang Song Dr. Xue Xiao Pei Huang Assoc. Prof. Li Li Prof. Aaron Monte Dr. Wael M. Abdel‐Mageed Dr. Jian Wang Hui Guo Dr. Wenni He Feng Xie Dr. Huanqin Dai Miaomiao Liu Dr. Caixia Chen Hao Xu Assoc. Prof. Mei Liu Dr. Andrew M. Piggott Assoc. Prof. Xueting Liu Prof. Robert J. Capon Prof. Lixin Zhang 《Angewandte Chemie (International ed. in English)》2013,52(4):1231-1234
7.
A 2(3H)-furanone bearing chromonyl moiety at position-3 was synthesized and utilized for the construction of N-heterocycles such as pyrrolone, N-aminoquinolone, and pyridazinone derivatives. The reactivity of the chromonylfuranone toward some nitrogen nucleophiles such as ammonia, benzylamine, hydrazine, and phenylhydrazine was studied. On the other hand, thiation of the starting chromonylfuranone interestingly provides mono- and di-thiated products. The chemoselectivity of these reactions is discussed. The structures of all products obtained were elucidated from their analytical and spectral data. The antimicrobial activities of selected examples of the synthesized compounds were examined against two strains of bacteria and two fungus strains. Some of them showed promising antimicrobial activities. 相似文献
8.
A series of highly functionalized piperidine derivatives was synthesized through one-pot, five-component reaction of aldehydes, amines, and β-ketoesters. Silica sulfuric acid efficiently catalyzes the reaction to afford the corresponding piperidine derivatives in good yields. As a representative example, heating of 4-methylaninle, 4-fluorobezaldehyde, and methyl-acetoacetate in methanol in the presence of silica sulfuric acid furnished the corresponding ethyl 2,6-bis(4-fluorophenyl)-1-p-tolyl-4-(p-tolylamino)-1,2,5,6-tetrahydropyridine-3-carboxylate in excellent yield (85%). Most of the synthesized compounds were screened in vitro for their antibacterial and antifungal activities. Most of compounds showed significant antibacterial activity. 相似文献
9.
A series of substituted 1,3,4‐oxadiazole, 1,2,4‐triazole, and 1,3,4‐thiadiazole derivatives of the substituted 3‐carboethoxy‐1,4‐dihydro‐4‐oxoquinoline have been synthesized through the reaction of the key intermediate thiosemicarbazide derivatives with different reagents. N′‐Arylidene‐4‐oxo‐1,4‐dihydroquinoline‐3‐carbohydrazides were also synthesized through the condensation reaction of the corresponding hydrazides with the appropriate aldehydes. Antimicrobial activity of some of the synthesized compounds was evaluated. 相似文献
10.
Hassan Talaat Ali H. Moussa M. Shalaby El-Wallid S. Sedik M. Tag El-Din Kamal 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(3):454-460
We apply the time-dependent theory to the collinear exchange reaction F + CH4 → FCH3 + H. We have performed detailed calculations on two-dimensional potential surfaces representing the ground electronic potentials of the collinear F + CH4 → FCH3 + H reaction, at incident energies. Transmission coefficients range from zero to unity, depending upon the incident energy. Normal modes of vibrations are displayed along the reaction path. 相似文献