Synthesis of mono-, di-, tri-, and tetraethyl-o-carboranes by electrophilic alkylation ofo-carborane with ethyl bromide in the presence of AICl3 and their transformations
作者:L. L Zakharkin、V. A. Ol'shevskaya、E. V. Vorontsov、P. V. Petrovsky
DOI:10.1007/bf01431128
日期:1996.11
action of EtBr on o-carborane in the presence of AICl3 were determined. The behavior of these o-carborane derivatives towards electrophilic and nucleophilic reagents was studied. The presence of four ethyl groups in positions 8, 9, 10, and 12 of the carborane polyhedron increases the electron density on the boron atoms in positions 4, 5, 7, and II to the point where they are able to enter into reactions
在 EtBr 对邻碳硼烷的作用下制备 9-乙基-、9,12-二乙基、8,9,12-三乙基-和 8,9,10,12-四乙基-邻碳硼烷的最佳条件测定了 AlCl3 的存在。研究了这些邻碳硼烷衍生物对亲电和亲核试剂的行为。在碳硼烷多面体的 8、9、10 和 12 位存在四个乙基基团,增加了 4、5、7 和 II 位硼原子上的电子密度,使其能够参与以下反应:亲电取代,并且在位置 3 和 6 到它们对亲核试剂的作用产生抗性的程度。研究了 1,2-二锂-8,9,10,12-四乙基-o-碳硼烷与各种亲电子试剂的反应。