ABSTRACT Chemical shift of the fluorine atom, d(19F), in the series of p-fluoro substituted aromatic amines were used to calculate the substituent constants for different amino groups. 1-Pyrrolidino group has the highest electron-donor properties among different amino groups studied. 1-Piperidino group is rather weak electron-donor. On the other hand, the amino nitrogen atoms in N,N-diethylaniline, 1-methyl-1,2,3,4-tetrahydroquinoline and julolidine are strong electron-donors. The nitrogen atom in 1-methylindoline is much weaker donor. ortho-Methyl diminish the donor properties of the N,N-dimethylamino group but it does not affect the unsubstituted amino group. The amino nitrogen atom in 1,2,3,4-tetrahydroquinolines is a stronger electron-donor than that in indolines. The calculated substituent constants of the amino groups studied are consistent with the spectral and reactivity data available in literature.
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