Substituent effects on carbon-13 chemical shifts in 2,6-disubstituted adamantanes
摘要:
AbstractCarbon‐13 NMR spectral data for a series of symmetrical 2,6‐disubstituted adamantanes (O, CH2, CH3, OH, OCOCH3) are presented. The substituent effects on 13C chemical shifts are additive, except for carbons 2 and 6 in 2,6‐adamantanedione. The non‐additivity of the substituent effect in the diketone can be interpreted in terms of a through‐space interaction of the carbonyl π‐electrons; the additivity in the other derivatives indicates that there is no appreciable interaction between the substituents.