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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969448736> ?p ?o ?g. }

• W1969448736 endingPage "12733" @default.
• W1969448736 startingPage "12727" @default.
• W1969448736 abstract "The NMR spectroscopic investigation of solutions of the iminium ions Me2N+C(H)Cl (1+), Me2N+ C(H)Ph (2a+), and Et2N+CH2 (3+) in aprotic solvents shows that the replacement of the weakly nucleophilic counterions SbCl6-, AlCl4-, BF4-, or CF3SO3- by halide ions (I-, Br-, Cl-) causes a deshielding of the proton at the iminium carbon atom (Δδmax = +2.8 for 2a+ in CD2Cl2) while the chemical shifts of all other 1H and 13C nuclei remain almost unaffected. The solvent dependence of these effects, 14N NMR investigations, and ab initio MO calculations suggest that iminium halides form CH···Y- hydrogen bonds (Y = Cl, Br, and I) and thus exist as contact ion pairs in acetonitrile, chloroform, dichloromethane, and dimethyl sulfoxide solutions. In liquid sulfur dioxide, specific anion−cation interactions cannot be observed due to the superior solvation of the anions by SO2." @default.
• W1969448736 created "2016-06-24" @default.
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• W1969448736 date "1997-12-01" @default.
• W1969448736 modified "2023-10-16" @default.
• W1969448736 title "NMR Spectroscopic Evidence for the Structure of Iminium Ion Pairs" @default.
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• W1969448736 doi "https://doi.org/10.1021/ja972860u" @default.
• W1969448736 hasPublicationYear "1997" @default.
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