中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-Methyl-trans-4-tert-butylcyclohexanecarboxylic acid | 27069-57-4 | C12H22O2 | 198.305 |
—— | methyl 4-tert-butyl-1-methylcyclohexanecarboxylate | 219812-28-9 | C13H24O2 | 212.332 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-Methyl-trans-4-tert-butylcyclohexanecarboxylic acid | 27069-57-4 | C12H22O2 | 198.305 |
The 13C shieldings of the primary carbinyl carbons in cyclohexylmethanol, its acetate and methyl ether as well as those for the corresponding carbon in their 4-t-butyl derivatives have been measured at 15.1 MHz using the 'proton-decoupling' method. Similar data for the 1-methyl-4-t-butylcyclohexylcarbinols and their acetates were obtained to examine the influence of the additional methyl substituent. Possible origins of the observed conformational effects on 13C nuclear shieldings are considered. The 1H results for the methylene protons in these carbinyl groups are also presented and discussed. These results, which permit estimations of the conformational free energies (−ΔG°) of the —CH2OR groupings (R = H, Ac, Me), are presented to illustrate the 13C approach to conformational analysis.