Abstract
The 1H n.m.r. spectra of some 5-substituted-3-isopropyl-6-methyl uracils were determined in deuterated dimethyl sulfoxide (d 6-DMSO). The substituents are: H, Cl, Br, I, NO 2, NH 2, N(CH 3) 2, C 6H 5, C 6H 4-NO 2-p and C 6H 4-NH 2-p. It has been shown that relative chemical shift (Δδ) of N (1)-H proton of some of the examined compounds correlated linearly with Hammett σ m constant for the substituents in position 5 of uracil ring. The correlation with the σ m constant was interpreted as providing evidence that the inductive effect of the substituent on chemical shift is dominating one.
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