A Comparative 19F NMR study of electronic effects in some fluoroaryl compounds of antimony and bismuth and in their carbon and nitrogen analogues |
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Authors: | AN Nesmeyanov DN Kravtsov BA Kvasov SI Pombrik EI Fedin |
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Institution: | Institute of Organo-Element Compounds, Academy of Sciences, Moscow U.S.S.R. |
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Abstract: | A number of m- and p-fluorophenyl compounds of type Ar2QC6H4F (Q = Sb, Bi, N and CH; Ar = C6H5, C6H4F) have been prepared. The l0F chemical shifts relative to fluorobenzene have been measured in cyclohexane, chloroform and pyridine for all these compounds. On the basis of the data obtained, the electronic nature of the Ar2Sb and Ar2Bi substituents has been studied and compared with that of the corresponding (C6H5)2N and (C6H5)2CH groups. The electronic effect of the Ar2Sb and Ar2Bi substituents has been shown to be mainly inductive, its solvent susceptibility being in most cases close to zero relative to both electron- and proton- donating solvents. |
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