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note
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3 as the base, dimethyl-(E)-2-diethylaminobutenoate was formed in 61 % yield accompanied by product 6a.
-
-
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-
47
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33845341778
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note
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Unidentified products were obtained when monosubstituted ketenes were used in the reaction.
-
-
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48
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33845343542
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via
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The structure of 11a was confirmed by X-ray crystallography. CCDC-619544 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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49
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