Synthesis, structure and stereochemistry of diiodide complexes (E)[(η5-t-BuC5H3)Fe(CO)2I]2 (E = Me2Si, Me2SiSiMe2, and Me2SiOSiMe2)

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• 作者：Zhang ; Yongqiang ; Wang ; Baiquan ; Xu ; Shansheng ; Zhou ; Xiuzhong ; Sun ; Jie
• 刊名：Transition Metal Chemistry
• 出版年：1999
• 出版时间：1999
• 年：1999
• 卷：24
• 期：6
• 页码：722-725
• 全文大小：118 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-901X

文摘

Reactions of diiron complexes (E)[&eegr;$^5$-t-BuC$\_5$H$\_3$)Fe(CO)]$\_2$(&mgr;-CO)$\_2$ [E = Me$\_2$Si (1), Me$\_2$SiSiMe$\_2$ (2), and Me$\_2$SiOSiMe$\_2$ (3)] with iodine in CHCl$\_3$ yielded diiodide complexes (E)[&eegr;$^5$-t-BuC$\_5$H$\_3$)Fe(CO)$\_2$I]$\_2$ [E=Me$\_2$Si (5), Me$\_2$SiSiMe$\_2$ (6), and Me$\_2$SiOSiMe$\_2$ (7)]. Like (1–3), complexes (5–7) also exists as mixtures of cis and trans isomers even though the Fe–Fe bond in (1–3) has been cleaved. When the pure isomers (1–3) reacted with iodine respectively in CHCl$\_3$, the cis isomers (1c–3c) yielded only the cis products (5c–7c), whereas the trans isomers (1t–3t) yielded only the trans isomers (5t–7t). This indicates that iodination of bridged diiron complexes is stereospecific. Similar treatment of trans-(Me$\_2$Si)[{&eegr;$^5$-t-(heptyl)C$\_5$H$\_3$}Fe(CO)]$\_2$(&mgr;-CO)$\_2$ (4t) with iodine gave only the trans product (Me$\_2$Si)[{&eegr;$^5$-t-(heptyl)C$\_5$H$\_3$}Fe(CO)$\_2$I]$\_2$ (8t). The molecular structure of (5t) was determined by X-ray diffraction.