NMR study (1H, 13C and 29Si) of the methylallylsilanes |
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Authors: | L Drlmulle GP Van Der Kelen |
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Affiliation: | Laboratory for General and Inorganic Chemistry-B, University of Gent, Krijgslaan 271. B-9000 GentBelgium |
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Abstract: | 1H, 13C and 29Si NMR data for the compounds (CH3)xSi(CH2CHCH2)4-x are reported. The 1H resonances from the π system are indicative of the electron-supplying inductive effect (+I) of the (CH3SiCH2, moiety but the corresponding 13Cπ chemical shifts seem to be influenced by a sterically induced polarization of the C-H bonds. The 13CAll, 13CMe and 29Si chemical shift data reveal an important neighbour anisotropy contribution originating from the π system. Ultraviolet study of the compounds mentioned above gives indication of a σ—π conjugation in accordance with PES and ab initio results 1—5]. The trend observed in the various coupling constants is too small to be Interpreted. |
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