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back hydrogen
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     Then, by back hydrogen transfer or random reaction, the polarized products can be observed to give CIDNP effects.
     形成的自由基对通过笼内的反向氢转移或随机对的反应形成极化产物,显示出CIDNP效应。
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The photoreactions of 1 acetylindole 2, 3 didone (AID) with several hydrogen donors in benzene d\-6 and acetonitrile d\-3 at room temperature were investigated by measurement of the chemically induced dynamic nuclear polarization (CIDNP). The polarization pattern of AID indicates an intermediate with spin density distribution of a σ π radical, in this case, a neutral radical AIDH· was formed.\;A hydrogen attraction interaction between \{\}\+3AID\+* and the donors resulted in the formation of stable...

The photoreactions of 1 acetylindole 2, 3 didone (AID) with several hydrogen donors in benzene d\-6 and acetonitrile d\-3 at room temperature were investigated by measurement of the chemically induced dynamic nuclear polarization (CIDNP). The polarization pattern of AID indicates an intermediate with spin density distribution of a σ π radical, in this case, a neutral radical AIDH· was formed.\;A hydrogen attraction interaction between \{\}\+3AID\+* and the donors resulted in the formation of stable neutral radical pairs, which have triplet multiplicity and can diffuse apart to make the pair loose enough for the nuclear polarization to be developed. The radical pairs could undergo back hydrogen transfer or separate and diffuse and meet again to lead to the observed products.

采用CIDNP方法对UV光照条件下的 1 乙酰基 2 ,3 吲哚二酮与几类氢给体的光诱导氢转移反应进行了研究

Describes the process of the superheating of the organic sulfur hydroreforming catalyst bed,analyzes the reasons of catalyst bed temperature soaring up.By relative countermeasures,the conclusion was drawn that oil brought by feed back hydrogen caused catalyst agglomeration.This conclusion can provide useful information for hydrogen plant design and the production.

叙述有机硫加氢催化剂床层温度超高的过程 ,分析引起床层飞温的原因 ,通过相应对策的实施 ,得出了返氢带油是引起催化剂烧结原因的结论 ,旨在为制氢装置的设计、生产部门提供借鉴和依据。

 
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