| 摘要 |
PURPOSE:To obtain 2,2,4,6,6-pentamethylheptane-4-thiol in high purity and yield by using recovered triisobutylene having poor reactivity. CONSTITUTION:Isobutylene of formula I or a mixture of triisobutylenes of formulas I and II having a component ratio of (formula I/formula II) of >=1 is reacted with hydrogen sulfide in the presence of a boron trifluoride complex with an carboxylic acid or in the coexistence of a Lewis acid and a protonic acid at 2-30atm, especially at 3-15atm and -100 to +50 deg.C, especially -40 to +10 deg.C to produce 2,2,4,6,6-pentamethylheptane-4-thiol of formula III. It is especially preferable to use 0.01-0.5mol of boron trifluoride complex with a carboxylic acid, and 0.01-0.5mol of Lewis acid and 0.005-0.5mol of protonic acid in the cocatalyst system. The yield of the objective compound can be improved by contacting the reaction liquid with a reaction stopper after the reaction to stop the reaction. |
