New Insight into the Hydrocarbon-Pool Chemistry of the Methanol-to-Olefins Conversion over Zeolite H-ZSM-5 from GC-MS, Solid-State NMR Spectroscopy, and DFT Calculations
作者:Chao Wang、Yueying Chu、Anmin Zheng、Jun Xu、Qiang Wang、Pan Gao、Guodong Qi、Yanjun Gong、Feng Deng
DOI:10.1002/chem.201403972
日期:2014.9.22
Overzeolite H‐ZSM‐5, the aromatics‐based hydrocarbon‐pool mechanism of methanol‐to‐olefins (MTO) reaction was studied by GC‐MS, solid‐state NMR spectroscopy, and theoretical calculations. Isotopic‐labeling experimental results demonstrated that polymethylbenzenes (MBs) are intimately correlated with the formation of olefin products in the initial stage. More importantly, three types of cyclopentenyl
通过GC-MS,固态NMR光谱和理论计算研究了H-ZSM-5沸石上甲醇到烯烃(MTO)反应的基于芳烃的烃池机理。同位素标记的实验结果表明,聚甲基苯(MBs)在初始阶段与烯烃产物的形成密切相关。更重要的是,首次通过固态NMR光谱法鉴定了三种类型的环戊烯基阳离子(1,3-二甲基环戊烯基,1,2,3-三甲基环戊烯基和1,3,4-三甲基环戊烯基阳离子)和五甲基苯甲鎓离子。在共同进料([ 13 C 6 ]苯和甲醇)条件下和典型的MTO工作(进料[ 13C]甲醇)条件。13 C标记实验显示了MBs(从二甲苯到四甲基苯)和碳阳离子(三甲基环戊烯基和五甲基苯离子)的可比反应性,证明它们通过配对机制共同作用产生丙烯。DFT理论计算也支持基于芳烃的完整催化循环中的配对路线。
The Use of 2-Chloro-4<i>H</i>-4-oxo-pyrido[1,2-a]pyrimidine as a Building Block in the Synthesis of Some New Heterocyclic Compounds
作者:Doria S. Badawy、Noha M. Awad、Ebrahim Abdel-Galil
DOI:10.1002/jhet.1036
日期:2013.11
New approaches for the synthesis of some heterocyclic compounds, such as the pyridopyrimidodiazepine derivative 3, pyrazolopyrido[1,2‐a]pyrimidine derivative 4, tetrazolo[1.5‐a][1,8]naphthyridine derivative 9, pyrazolylpyrido[1,2‐a]pyrimidine derivatives 10a,10b,12, pyrrolopyrido[1,2‐a]pyrimidine derivatives 14a, 14b, 14c, 14d, and 16a,16b, starting from 2‐chloro‐4H‐4‐oxo‐pyrido[1,2‐a]pyrimidine (1)