Deuterium-induced isotope shifts in a series of ML n (L = statistical mixture of 3-oxido-2phenylpropenal-d 0 , -1-d and -1,3-d 2 ) were measured. The 13 C NMR isotope shifts, C(D) À C(H) , for the aldehydic CH of AlL 3 , Al(OiPr) 2 L, (CH 3 ) 2 AlL, SiBr 3 L, SiL 3 HBr 2 À , (CF 3 ) 3 GeL, (EtO) 4 NbL, Rh(CO) 2 L, PdL 2 , SbCl 4 L and (EtO) 4 TaL are small and positive. The positive isotope shifts are unusual, but since they are small and temperature independent they are intrinsic. A relationship between these isotope shifts and the chemical shifts can be discerned and attributed to isotopic perturbation of resonance in an allylic cation.

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