共查询到20条相似文献,搜索用时 484 毫秒
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Jochen Eßer 《Chemie in Unserer Zeit》2011,45(2):96-120
Crude oil still is one of the most important sources of primary energy. With an annual consumption of nearly four billion metric tons it is also the most important raw material for the chemical industry. The complex process network of a modern oil refinery is used to upgrade crude oil into a wide variety of intermediates and products. 相似文献
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Yajie Wang Xiao Dong Xingyu Tang Haiyan Zheng Kuo Li Xiaohuan Lin Leiming Fang Guang'ai Sun Xiping Chen Lei Xie Craig L. Bull Nicholas P. Funnell Takanori Hattori Asami Sano‐Furukawa Jihua Chen Dale K. Hensley George D. Cody Yang Ren Hyun Hwi Lee Ho‐kwang Mao 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(5):1482-1487
Pressure‐induced polymerization (PIP) of aromatics is a novel method for constructing sp3‐carbon frameworks, and nanothreads with diamond‐like structures were synthesized by compressing benzene and its derivatives. Here by compressing a benzene‐hexafluorobenzene cocrystal (CHCF), H‐F‐substituted graphane with a layered structure in the PIP product was identified. Based on the crystal structure determined from the in situ neutron diffraction and the intermediate products identified by gas chromatography‐mass spectrum, we found that at 20 GPa CHCF forms tilted columns with benzene and hexafluorobenzene stacked alternatively, and leads to a [4+2] polymer, which then transforms to short‐range ordered H‐F‐substituted graphane. The reaction process involves [4+2] Diels–Alder, retro‐Diels–Alder, and 1‐1′ coupling reactions, and the former is the key reaction in the PIP. These studies confirm the elemental reactions of PIP of CHCF for the first time, and provide insight into the PIP of aromatics. 相似文献
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N. G. Chernorukov A. V. Knyazev N. Yu. Kuznetsova S. N. Golubev 《Russian Journal of Inorganic Chemistry》2008,53(8):1303-1310
Synthetic procedures have been developed and compounds of composition K x Rb y Cs z TaWO6 (x + y + z = 1) have been obtained. Their structure has been investigated by X-ray diffractometry. It has been shown that a continuous series of solid solutions is formed in the ternary system under study. Thermal decomposition of AITaWO6 compounds (AI = K, Rb, Cs) has been investigated by high-temperature X-ray diffractometry. 相似文献
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Stephen D. Williams Timothy J. Johnson Thomas P. Gibbons Christopher L. Kitchens 《Theoretical chemistry accounts》2007,117(2):283-290
The accuracy of various computational methods (Hartree–Fock, MP2, CCSD, CAS-SCF, and several types of DFT) for predicting
relative intensities in Raman spectra for C6H6, C6D6, and C6F6 was compared. The predicted relative intensities for ν1 and ν2 were compared with relative intensities measured by an FT-Raman spectrometer. While none of these methods excelled at this
prediction, Hartree–Fock with a large basis set was most successful for C6H6 and C6D6, while PW91PW91 was the most successful for C6F6. 相似文献
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