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24D, 42D>34D, 43D>56D, 65D>45D, 54D. The isotope shifts observed are suggested to be a sum of contributions from low frequency shift due to inductive-type and negative hyperconjugation perturbations. The C-D bond, as a poorer electron acceptor than a C-H bond induces less positive charge on directly attached oxygens O1 and O2. This in turn, causes shielding of C1 and C2 in C1O1CD2 and C2O2CD2 fragments. The difference in 34DC1 and 43DC2 values is attributed to the conformational dependence of the negative hyperconjugation. The C1 and C2, are in fact, not equally affected by the two CD2 groups by negative hyperconjoagation because of the existence of NO2 group attached to the benzene ring.]]>
p. 6−12
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