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Lewis acid/Lewis base bifunctional salen-zinc or salen-titanium catalysts: M. W. Fennie, E. F. DiMauro, E. M. O'Brien, V. Annamalai, M. C. Kozlowski, Tetrahedron 2005, 61, 6249.
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In contrast, α-branched aliphatic aldehydes such as cyclohexylcarbaldehyde reacted very slowly under the standard conditions
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In contrast, α-branched aliphatic aldehydes such as cyclohexylcarbaldehyde reacted very slowly under the standard conditions.
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The absolute configuration was determined for 3 f by comparison of the specific optical rotation with literature data (N. Sakai, S. Ageishi, H. Isobe, Y. Hayashi, Y. Yamamoto, J. Chem. Soc. Perkin Trans. 1 2000, 71). Since a uniform reaction pathway can be assumed, the configuration has been assigned to all β-lactones 3.
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The absolute configuration was determined for 3 f by comparison of the specific optical rotation with literature data (N. Sakai, S. Ageishi, H. Isobe, Y. Hayashi, Y. Yamamoto, J. Chem. Soc. Perkin Trans. 1 2000, 71). Since a uniform reaction pathway can be assumed, the configuration has been assigned to all β-lactones 3.
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