NMR OBSERVATION OF THE KOCH REACTION IN ZEOLITE H-ZSM-5 UNDER MILD CONDITIONS
NMR OBSERVATION OF THE KOCH REACTION IN ZEOLITE H-ZSM-5 UNDER MILD CONDITIONS
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DOI：
10.1021/ja00117a032
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发表时间：
1995-03
影响因子：
15
通讯作者：
A. Stepanov;M. V. Luzgin;V. N. Romannikov;K. Zamaraev
中科院分区：
文献类型：
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作者：
A. Stepanov;M. V. Luzgin;V. N. Romannikov;K. Zamaraev
根据方案1，应主要观察到来自TMAA的13 C-标记的季碳原子的信号。实际上，图1A中40.7 ppm处信号的化学位移与液体TMAA中季碳原子的信号（38.5 ppm 8）之间存在良好的一致性。这一事实支持了TMAA的形成。在81.4 ppm处的信号，其对于与氧结合的叔丁基是典型的，应归因于叔丁基甲硅烷基醚，即与沸石骨架9的氧结合的叔丁基或未反应的醇。10在甲基中用13 C标记的f-BuOH的共吸附中观察到的两个信号之一（f-BuOH-1 - 13 C）和未标记的CO，即27.8 ppm处的信号（图1B），进一步支持TMAA的形成。实际上，液体TMAA的甲基在27.8ppm处表现出信号，即，它们的
According to Scheme 1, mainly the signal from the 13C-labeled quaternary carbon atom of TMAA should be observed. Indeed, there is good agreement between the chemical shift for the signal at 40.7 ppm in Figure 1A and that for the signal of the quaternary carbon atom in liquid TMAA (38.5 ppm8). This fact supports the formation of TMAA. The signal at 81.4 ppm, which is typical for a feri-butyl group bound to oxygen, should be attributed to either feri-butyl silyl ether, ie, the ferf-butyl group bound to the oxygen of the zeolite framework9 or unreacted alcohol. 10One of the two signals observed for coadsorption of f-BuOH, labeled with 13C in a methyl group (f-BuOH-i-13Cj, and the unlabeled CO, namely the signal at 27.8 ppm (Figure IB), further supports the formation of TMAA. Indeed, methyl groups of liquid TMAA exhibit the signal at 27.8 ppm, 8 ie, their