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Leif R. Knöpke, Sebastian Reimann, Dr. Anke Spannenberg, Prof. Dr. Peter Langer, Prof. Dr. Angelika Brückner and Dr. Ursula Bentrup Elucidating the Directing Effect of Lewis Acids on the Reaction Pathway in Formal [3+3] Cyclocondensation Reactions: A Comprehensive In Situ Spectroscopic Study ChemCatChem 3

Version of Record online: 22 JUL 2011 | DOI: 10.1002/cctc.201100150

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The Lewis acid makes the difference! Different spectroscopic methods (UV/vis, ATR-IR, and Raman) were applied in situ as well as ex situ to elucidate the mode of action of different Lewis acids in the [3+3] cyclization reaction of a 1,3-bis(silyloxy)-1,3-butadiene with a ketenacetale. The different interaction of two different Lewis acids with the ketenacetale was spectroscopically characterized and identified as the crucial step, which influences the subsequent reaction pathways.

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