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Dimethyl acetylenedicarboxylate was reported to react directly with silicon-phosphorus bond of a heterocyclic sillylphosphine: S. Haber, M. Schmitz, U. Bergsträßer, J. Hoffmann, M. Regitz, Chem. Eur. J. 1999, 5, 1581
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Dimethyl acetylenedicarboxylate was reported to react directly with silicon-phosphorus bond of a heterocyclic sillylphosphine: S. Haber, M. Schmitz, U. Bergsträßer, J. Hoffmann, M. Regitz, Chem. Eur. J. 1999, 5, 1581.
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13C NMR comparison with alkynylketone adducts reported in Ref. 4. The similarity of their magnitude of the coupling constants showed that 3a and 3b also have the same regio- and stereochemistry as the reported examples.
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13C NMR comparison with alkynylketone adducts reported in Ref. 4. The similarity of their magnitude of the coupling constants showed that 3a and 3b also have the same regio- and stereochemistry as the reported examples.
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34250180655
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3/n-hexane = 1/3 for 3c) to give the corresponding silylphosphine adduct.
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3/n-hexane = 1/3 for 3c) to give the corresponding silylphosphine adduct.
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15
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34250163650
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The olefinic carbon signals with a relatively large coupling constant have been assigned as the carbon at 3-position (adjacent to the phosphorus) in the case of related silylphosphinated alkynyl ketones.4 However, our HMQC and HMBC analyses of 3a, 3d, and 3i revealed that these doublet signals with relatively large coupling constants are certainly assigned as the carbon adjacent to Si, whereas the signals with relatively small coupling constants are assigned as the carbon adjacent to P.7,12
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7,12
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Supporting Information is available electronically on the CSJ-Journal Web site, http://www.csj.jp/journals/chem-lett/ index.html.
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Supporting Information is available electronically on the CSJ-Journal Web site, http://www.csj.jp/journals/chem-lett/ index.html.
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