小中大[求助]LDA拔氢实验求助
A solution of n-BuLi(5.4 mL of 2.3 M solution in hexanes,12.5 mmol)was added to i-Pr2NH(1.8 mL,12.5 mmol)in THF(10 mL)at-78°C.The mixture was stirred at-78°C for 0.5 h then a solution of tert-butylsuccinate(2)17(1.0 g,5.7 mmol)in THF (5 mL)was added.The reaction was warmed to 0°C and stirred for 2 h,then recooled to-78°C and the alkyl halide(8 mmol)was added dropwise.The reaction was allowed to warm to r.t.and stirred for 24 h.The reaction was quenched with H2O(3 mL)and concentrated.
文献是自己制备LDA,我是直接买的。-78°C我打算用丙酮干冰浴实现(丙酮干冰有特殊比例要求吗?)文献中是微量制备,我想放大10倍,可行吗?放大后要注意什么呢?文中要求滴加反应物,是要用恒压滴液漏斗吗?如何控制没有空气进入体系呢?取LDA时需要注意什么呢,没有双头针,打算做个氮气球,用两个针来取!问题很多,第一次做这种反应,据说很危险,所以向大家来讨教了!