Abstract Carbon-13 chemical shift assignments for nine 7, 7-disubstituted 2, 6-ditert- butylquinone methides of the types III-VI are reported. The 13 C shifts of the exocyclic double bond carbon atoms are extraordinarily sensitive to C (7) substitution, viz. ΔδC (7)= 82.4 ppm and ΔδC (4)= 56.7 ppm on going from the dimethylamino to the cyano substituent. In contrast, electronic properties of the substituents are only weakly expressed on the ...
