AbstractA series of 2‐aryl‐2‐hydroxy‐1,1,3,3‐tetramethyl‐5,8‐dioxaspiro[3.4]octanes (1), 3‐aryl‐3‐hydyoxyl‐2,2,4,4‐tetyramethylcyclobutanones (2), and l‐aryl‐2,2,4‐trimethyl‐1,3‐pentadiones (3) were studied using13C NMR analyses. The chemical shifts of C‐c are dependent on the substituent groups on the phenyl ring for compounds1(ρ =‐0.966, R2= 0.987) and2(ρ = −1.378, R2= 0.998). The chemical shifts of C‐a follow a similar trend (ρ =−0.926, R2= 0.989). In the case of compounds3, C‐c yielded the opposite trend with very poor correlation coefficiency (ρ = 1.22, R2= 0.179). This result reveals the field effect of a polar bond and resonance‐induced changes in pi el