稳定同位素方法研究模型化合物之间的氢转移反应

二十烷，菲作为模型化合物，以四氢萘为供氢剂，在临氮及临氢体系中应用氘代四氢萘考察供氢剂的氢转移反应，发现供氢剂抑制烷烃的裂化，其作用是通过脱氢湮灭自由基来抑制裂化反应。临氮及临氢条件下，与正二十烷与菲的二元体系相比，正二十烷，菲和四氢萘三元体系中四氢萘不仅能生成较多的菲的氢化芳烃产物，而且稳定同位素方法表明氘代四氢萘可以向菲和菲的氢化芳烃产物转移更多的氘，同时发现H12－四氢萘和D12－四氢萘的供氢（氘）率上存在着动力学同位素效应。

HYDROGEN-TRANSFER BETWEEN HYDROGEN DONORS AND MODEL COMPOUNDS WITH STEADY ISOTOPE

The hydrogen-transfer between hydrogen donors and model compounds was studied by using n-C 20 and phenanthrene as model compounds, tetralin as hydrogen donor, and deuterated tetralin C 10 D 12 as deuterated H-donor. The results show that in dual system of paraffin and hydrogen donor, inhibition of thermal- or hydro-cracking of paraffin with tetralin was ascribed to the dehydrogenation of tetralin for scavenging the thermal radicals. It is found that there existed a substantial isotopic effect between H-donor and D-donor. On the other hand, Deuterium-transferring in the ternary system of eicosane, phenanthrene and deuterated tetralin under nitrogen and hydrogen shows that poly-ring aromatics could get hydrogen transferred from donor and yield derivative hydroaromatics.