Isolation and Structures of Two New Organozinc Anions from Solutions Rich in Halide Ions

The organometallic dianions diethyltetrachlorodizincate, [Et(Cl)Zn(μ-Cl)2Zn(Cl)Et], and ethyltribromozincate, [EtZnBr3], have been isolated from reaction mixtures containing diethylzinc and a tetraphenylphosphonium halide (X = Cl or Br). Evidence for these anions had previously been reported using mass spectrometry. The ions may have importance in the solution structure of organozinc reagents used extensively in organic synthesis.

本研究从包含二乙基锌与四苯基鏻卤化物（X=Cl或Br）的反应混合物中，成功分离得到两种有机金属二阴离子：二乙基四氯二锌酸根（diethyltetrachlorodizincate，[Et(Cl)Zn(μ-Cl)₂Zn(Cl)Et]）与乙基三溴锌酸根（ethyltribromozincate，[EtZnBr₃]）。此前已有研究借助质谱法报道了这类阴离子的存在证据。该类离子对于有机合成中广泛使用的有机锌试剂的溶液结构可能具有重要意义。