Reactive-state spin-dependent diastereoselective photoisomerization of trans,trans-2,3-diphenylcyclopropane-1- carboxylic acid derivatives included in zeolites.
Reactive-state spin-dependent diastereoselective photoisomerization of trans,trans-2,3-diphenylcyclopropane-1- carboxylic acid derivatives included in zeolites.
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DOI：
10.1021/ol026695l
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发表时间：
2002-11
期刊：
影响因子：
5.2
通讯作者：
J. Sivaguru;T. Shichi;Vaidhyanathan Ramamurthy
中科院分区：
文献类型：
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作者：
J. Sivaguru;T. Shichi;Vaidhyanathan Ramamurthy
[反应：在反式，反式-2，3-二苯基环丙烷衍生物的光异构化过程中，由手性助剂促进的不对称诱导取决于介质（溶液与沸石）和反应状态（单线态与三线态）。在沸石内，直接激发最有可能经由两性离子中间体进行，而三重态敏化最有可能经由双自由基中间体进行。
[reaction: see text] The asymmetric induction facilitated by a chiral auxiliary during the photoisomerization of trans,trans-2,3-diphenylcyclopropane derivatives depends on the medium (solution vs zeolite) and the reactive state (singlet vs triplet). Within zeolites, direct excitation most likely proceeds via a zwitterionic intermediate, while triplet sensitization most likely proceeds via a diradical intermediate.