Wavelength‐dependent photochemistry of 1‐phenyl‐1‐diazopropane

Wavelength‐dependent photochemistry of 1‐phenyl‐1‐diazopropane
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1-苯基-1-重氮丙烷的波长依赖性光化学

DOI:
10.1002/poc.4298
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发表时间:
2021
影响因子:
1.8
通讯作者:
Platz, Matthew S.
Platz, Matthew S.
中科院分区:
化学4区
文献类型:
--
作者:
Tokihiro, Jodie;Fitzpatrick, Caralyn;Platz, Matthew S.

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1‐苯基‐1‐重氮丙烷(PDP)在乙腈/甲醇混合物中使用520 nm或350 nm光进行光解。主要光产物为1‐甲氧基丙苯和e,Z‐1‐苯丙烯。在520 nm光下,(1‐甲氧基丙苯)/(E,Z‐1‐苯丙烯)与甲醇浓度呈线性关系。这些结果与可见光诱导的pdp2分裂成二氮和封闭壳单线态(S0)乙基苯基卡宾(1EPC)相一致,该单线态(S0)乙基苯基卡宾(1EPC)在1,2氢迁移之间分裂生成烯烃,并与甲醇反应生成醚。用350 nm光生成的相同图明显偏离线性。提出350 nm光产生的碳在振动激发下的开壳s1激发态(1EPC*)。在这种状态下,toE,Z - 1 -苯基丙烯会重新排列,并在几十ps的范围内松弛到基态。因此,在350 nm光下,甲醇不能完全抑制pdp光解时的烯烃生成。卡宾激发态是一条“不可捕获的卡宾”通往烯烃的途径。
1‐Phenyl‐1‐diazopropane (PDP) was photolyzed in acetonitrile/methanol mixtures using either 520‐nm light or 350‐nm light. The main photoproducts were 1‐methoxypropylbenzene andE,Z‐1‐phenylpropene. With 520‐nm light, a plot of (1‐methoxypropylbenzene)/(E,Z‐1‐phenylpropene) versus methanol concentration was linear. These results are consistent with the visible light induced fragmentation ofPDPto dinitrogen and closed shell singlet (S0) ethyl, phenylcarbene (1EPC) which partitions between 1,2 hydrogen migration to form alkene, and reaction with methanol to form ether. The same plot generated with 350‐nm light significantly deviates from linearity. It is proposed that 350‐nm light generates the carbene in a vibrationally excited, open shell S1excited state (1EPC*). This state rearranges toE,Z‐1‐phenylpropenes in competition with relaxation to ground state1EPCover a few tens of ps. As a result, methanol cannot completely suppress alkene formation upon photolysis ofPDPwith 350‐nm light. The carbene excited state is a “non‐trappable carbene” route to alkenes.
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发表时间: 2007
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影响因子: 3.6
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