中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1,8-Terpin | 80-53-5 | C10H20O2 | 172.268 |
—— | (r-1,t-4)-p-menthane-1,7,8-triol | 154843-85-3 | C10H20O3 | 188.267 |
4-(2-羟基-2-丙基)环己烯-1-甲醇 | 7-hydroxyterpineol | 5502-74-9 | C10H18O2 | 170.252 |
Bromination of methylene groups exocyclic to cyclohexyl systems normally affords two isomeric products; the axial 1-bromo equatorial 1-bromomethyl compound and the axial 1-bromomethyl equatorial 1-bromo derivative. Free energy differences between these two isomers, and the conformations adopted by the axial 1-bromomethyl group, have been explored by n.m.r. spectroscopy, by X-ray crystallography and by MM3 calculations. Evidence is presented to show that the ax-bromomethyl group exists primarily as those rotamers which site the bromine atom synclinal to the vicinal bromine. The A value for a bromomethyl group in this system is then similar to that of an unsubstituted methyl group.