Reactions of Electron-Deficient Benzoheterocycle Triosmium Complexes with Lithium Isobutyronitrile
作者:Edward Rosenberg、Shariff E. Kabir、Md. Joynal Abedin、Kenneth I. Hardcastle
DOI:10.1021/om040046r
日期:2004.8.1
complexes spontaneous rearomatization of the addition product is observed on workup or on exposure to air after addition of the carbanion. The degree to which this occurs is controlled by the steric and electronic properties of the heterocycle, and by careful adjustment of the reactions conditions either the nucleophilic addition or substitution product can be observed. The solid state structures of two of
的缺电子benzoheterocycle triosmium通式的配合物的反应锇3(CO)9(μ 3 -η 2 -BZ)(μ-H)(BZH =菲啶,3 ; 2-甲基苯并咪唑,4 ; 2,3- dimethylbenzimidazole,5 ;喹喔啉,6 ; 2-甲基喹喔啉,7 ;苯并噻唑,8 ; 2-甲基苯并噻唑,9)与锂异丁腈报告。亲核加成在所有复合物的碳环被观察为对于先前报道的锇3(CO)9(μ 3 -η 2-Bz)(μ-H)(BzH =喹啉,1 ; 5,6-苯并喹啉,2),从而将亲核攻击的区域化学新变化扩展到整个复合物类别。然而,在某些配合物中,在后处理或加入碳负离子后暴露于空气中,观察到了加成产物的自发性重新瘤化。其发生的程度由杂环的空间和电子性质控制,并且通过仔细调节反应条件,可以观察到亲核加成或取代产物。报道了两种亲核加成产物的固态结构,用于与先前报道的类似喹啉配合物进行比较。