Five nopyl ethers and two nopyl esters have been synthesized, and their 13 C NMR spectra have been recorded. The C 6, C 7 chemical shifts in their 13 C NMR spectra have been discussed in terms of configuration structu...Five nopyl ethers and two nopyl esters have been synthesized, and their 13 C NMR spectra have been recorded. The C 6, C 7 chemical shifts in their 13 C NMR spectra have been discussed in terms of configuration structure. It is suggested that the C 1, C 2, C 3, C 4 and C 5 atoms are in the same plan and the 6,6 dimethylbicyclohept 2 ene part is in the Y shape. The ethers and esters obtained appeared to be derivatives of apopinene 6,6 dimethylbicyclohept 2 ene with substituents at the C 2 position . The effect of substituents occured mainly on the chemical shifts of C 1, C 2 and C 3. There seemes a weaker steric interaction of the substituents with other carbon atoms.展开更多
文摘Five nopyl ethers and two nopyl esters have been synthesized, and their 13 C NMR spectra have been recorded. The C 6, C 7 chemical shifts in their 13 C NMR spectra have been discussed in terms of configuration structure. It is suggested that the C 1, C 2, C 3, C 4 and C 5 atoms are in the same plan and the 6,6 dimethylbicyclohept 2 ene part is in the Y shape. The ethers and esters obtained appeared to be derivatives of apopinene 6,6 dimethylbicyclohept 2 ene with substituents at the C 2 position . The effect of substituents occured mainly on the chemical shifts of C 1, C 2 and C 3. There seemes a weaker steric interaction of the substituents with other carbon atoms.
