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The practical synthesis procedure of substituted tetraphenylene derivatives involving the synthesis of a precursor for 4, 7-dunethoxyisobenzofuran and Diets-Alder addition of 4, 7-dimethoxyisobenzofuran generated in situ to 5, 6, 11,12-te-tradehydrodibenzo[a,e]cyclooctene, followed by a low valent titanium mediated deoxygenation to give 1,4, 11, 14-tetra-methoxy-dibenzo[b, n] tetraphenylene, which can be further demethyiated to the corresponding phenolic compound, which was acetylated to afford 1,4,11,14-tetraacetoxy-dibenzo-[ b, n] tetraphenylene. 相似文献
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Kinetic calculation for the reaction of H with Si_2H_6 using the variational transition state theory
The reaction of disilane with atomic hydrogen has been studied. This reaction involves both substitution and abstraction. Calculations show that the hydrogen abstraction is the strongest competing channel. The canonical variational transition state theory with a small curvature tunneling correction (SCT) has been used for the kinetic calculation. The theoretical results are in good agreement with the available experimental data. Comparing the reactions of atomic hydrogen with disilane and silane, it can be seen that the reactivity of the Si-H bond is higher in Si2H6than that in SiH4. 相似文献
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TrichlorosilaneisanimportantmaterialinplasmaChemicalVaporDeposition (CVD)andinsemiconductordeviceprocess .1 4 Thereactionoftrichlorosilanewithatomichydrogen ,thesimplestfree radicalspecies,hasdrawnconsiderableattention :kineticparametersforH atomreactionared… 相似文献
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F+CH2CO的反应机理和动力学研究 总被引:7,自引:0,他引:7
用G3(MP2)方法对F与CH2CO的反应进行研究,揭示了该反应的加成-消除机理。F原子首先与CH2CO作用形成富能的中间体CH2FCO^*,此加成反应为无势垒过程。富能的CH2FCO^*可进一步发生解离或异构化反应生成各种可能的产物。其中CO和CH2F可能为反应的主要产物。根据从头算的结构,用RRKM-TST理论计算该反应的速率常数。总包反应速率常数与温度存在弱的依赖关系,与总压力无关。 相似文献