作者:Motokazu Uemura、Kazuhiko Take、Kazuo Isobe、Tatsuya Minami、Yuji Hayashi
DOI:10.1016/s0040-4020(01)91416-4
日期:——
(3-Methoxybenzylalcohol)chromium tricarbonyl (10) and (7-methoxy-1-tetralol)chromium tricarbonyl (12) are selectively lithiated at the 4- and 6-positions, respectively, by treatment with n-BuLi-TMEDA. Since the directed lithiation of the corresponding chromium free arenes normally proceeds at the 2-and 8-positions, complementarily substituted arenes can be prepared by using the chromium tricarbonyl complexes. The difierent
通过用n-BuLi-TMEDA处理,将(3-甲氧基苄醇)三羰基铬(10)和(7-甲氧基-1-四醇)三羰基铬(12)分别在4-和6-位选择性地锂化。由于相应的无铬芳烃的定向锂化通常在2和8位进行,因此可以使用三羰基铬络合物制备互补取代的芳烃。锂化的不同位置通过(芳烃)Cr(CO)3中三羰基铬的相对构型和静电因子来解释。一些蒽醌,31,36,42,和7- hydroxycalamenenes,43,已经通过(η的装置通过立体和区域选择性引入取代基的合成6 -arene)铬三羰基复合物。