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29544452337
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see the Supporting Information
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For an example of a cyclobutane with vicinal quaternary centers (18) that can be made using this method, see the Supporting Information.
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25
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29544445895
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CCDC-281469 (chiral ammonium salt of 5) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
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