共查询到20条相似文献,搜索用时 0 毫秒
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Russian Chemical Bulletin - 相似文献
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E. G. Baskir 《Russian Chemical Bulletin》1993,42(1):220-221
On the territory of the former USSR. 相似文献
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5th Mediterranean Basin Conference on Analytical Chemistry 总被引:1,自引:0,他引:1
Sergio Caroli 《Analytical and bioanalytical chemistry》2006,384(4):859-859
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Wafaa S. Hamama Mona E. Ibrahim Hadeer A. Raoof Hanafi H. Zoorob 《Research on Chemical Intermediates》2017,43(11):6259-6291
This review provides a survey of the advances in the methods of formation and chemical reactivity of bicyclic [1,3,4]thiadiazole 5-5 systems containing ring-junction nitrogen over the period from 1989 to the beginning of 2017. 相似文献
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探讨了华东理工大学等编《分析化学》(第5版)中波谱分析法、紫外吸收光谱法、气相色谱法、基本单元章节中内容取舍的问题;并对教材中的几个其他问题进行了探讨。 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(34):10266-10268
A Periodic System was proposed for the elements 1–172 by Pyykkö on the basis of atomic and ionic calculations. In it, the elements 121–138 were nominally assigned to a 5g row. We now perform molecular, relativistic four‐component DFT calculations and find that the hexafluorides of the elements 125–129 indeed enjoy occupied 5g states. 相似文献
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Four-membered and six-membered rings were chosen as substructure units to simulate molecular sieve of APO-5 type. The stability of various orderings of AlO4 and PO4 tetrahedra in micros tracture of the APO-5 type was studied by using CNDO/2 method.By means of analysing energies of systems, frontier orbitals, charges and bond orders in detail, Loewenstein's empirical rule is explained theoretically. 相似文献
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利用丙酮和草酸二乙酯为原料,通过Claisen酯缩合、肟化环合与氨水氨解,合成磺胺甲基异噁唑的关键中间体——5-甲基-3-异噁唑甲酰胺。通过红外光谱、核磁共振、熔点测定等方法验证其结构。本实验综合运用有机合成、产物分离和结构鉴定中的多种操作单元,并训练红外光谱、核磁共振等常用仪器分析技术,适合学生进行综合有机化学实验。 相似文献