Cyclic transition state in the acid cata
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Vladimir Gevorgyan; Isao Kadota; Yoshinori Yamamoto
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Article
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1993
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Elsevier Science
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French
β 269 KB
Br+nsted acid catalyzed or Bu&JF-Tic14 mediated cyclization of (Z)-ar-stannyl ether aldehyde la gives 2a, whereas (E)-isomer lb affords 2b. To explain this stereochemical outcome, a push-pull mechanism is proposed.