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Allylic-type strain is also possible between the benzyl side-chain and the iminium moiety but was apparently less significant
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Allylic-type strain is also possible between the benzyl side-chain and the iminium moiety but was apparently less significant.
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37
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34547173808
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CCDC 610170 and 610171 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data request/cif, or by emailing data request@ccdc.cam. ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: (+44)-1223-336033.
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CCDC 610170 and 610171 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data request/cif, or by emailing data request@ccdc.cam. ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: (+44)-1223-336033.
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Recently the structure of a hydrogen-bonded intermediate was disclosed: R. I. Storer, D. E. Carrera, Y. Ni, D. W. C MacMillan, J. Am. Chem. Soc. 2006, 128, 84.
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Recently the structure of a hydrogen-bonded intermediate was disclosed: R. I. Storer, D. E. Carrera, Y. Ni, D. W. C MacMillan, J. Am. Chem. Soc. 2006, 128, 84.
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40
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Our previous results show that the presence of non-coordinating counterions such as triflate, perchlorate and tetrafuloroborate is important in these reactions, see ref[7
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[7]
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41
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0037459411
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Significant couterion effects have been noted in other organocatalytic cycloadditions, see: a
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