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51.
C. K. Chu J. D. Wander R. L. Tackett W. B. Iturrian J. P. Schmitz G. E. Garner K. Chae 《Journal of heterocyclic chemistry》1984,21(6):1901-1903
A novel serotonin antagonist, 2,2′-bis[3-(2-N,N-dimethylaminoethyl)indolyl]sulfide (BDIS) was synthesized in one step from the reaction of N,N-dimethyltryptamine with thionyl chloride. 相似文献
52.
Wander A Searle BG Bailey CL Harrison NM 《The journal of physical chemistry. B》2005,109(48):22935-22938
Strong Lewis acid catalysts are widely used in a variety of industrial processes including Cl/F exchange reactions. Aluminum fluorides (AlF3) have great potential for use in such reactions. Despite the importance of the surface in the catalytic process little is known about the detailed atomic scale structure of AlF3 surfaces. In the current study we employ state of the art surface thermodynamics calculations based on hybrid-exchange density functional theory to predict the composition and structure of the basal plane surface of alpha-AlF3 for the first time. We examine four possible terminations of the alpha-AlF3 (0001) surface and demonstrate that the surface is terminated by a layer containing two fluorine atoms per cell at all realistic fluorine partial pressures. The fluorine ions in the outermost layer of the material reconstruct to mask the Al3+ ion from the external gas phase and consequently we would expect this surface to be inactive as a Lewis acid catalyst in line with experimental observation. 相似文献
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Alajarin M Vidal A Tovar F Ramirez De Arellano MC Cossio FP Arrieta A Lecea B 《The Journal of organic chemistry》2000,65(22):7512-7515
Efficient 1,4-asymmetric induction has been achieved in the highly stereocontrolled intramolecular [2 + 2] cycloadditions between ketenimines and imines, leading to 1,2-dihydroazeto[2, 1-b]quinazolines. The chiral methine carbon adjacent to the iminic nitrogen controls the exclusive formation of the cycloadducts with relative trans configuration at C2 and C8. The stepwise mechanistic model, based on theoretical calculations, fully supports the stereochemical outcome of these cycloadditions. 相似文献
55.
Dubbs T Albuquerque IF Bondar NF Carrigan R Chen D Cooper PS Lisheng D Denisov AS Dobrovolsky AV Endler AM Escobar CO Foucher M Golovtsov VL Gottschalk H Gouffon P Grachev VT Khanzadeev AV Kubantsev MA Kuropatkin NP Lach J Pengfei L Chengze L Yunshan L Luksys M Mahon JR McCliment E Morelos A Newsom C Pommot Maia MC Samsonov VM Schegelsky VA Huanzhang S Smith VJ Fukun T Terentyev NK Timm S Tkatch II Uvarov LN Vorobyov AA Jie Y Wenheng Z Shuchen Z Yuanyuan Z 《Physical review letters》1994,72(6):808-811
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