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A Study on the Three-component Reactions of Cyclopentadienyldicarbonyliodoiron or Indenyldicarbonyliodoiron with Methyllithium in the Presence of Triphenylphosphine

茂基二羰基碘鐵或茚基二羰基碘基鐵與甲基鋰在三苯基膦存在下的三成分反應研究

摘要


(η^5-C_5H_5)Fe(CO)_2I和MeLi在PPh_3存在下,低溫進行之三成分反應中,生成環上烷化產物(η^4-exo-MeC_5H_5)Fe(CO)2(PPh_3)(77.8%)。(η^5-C_9H_7)Fe(CO)_2I和MeLi在PPh_3存在下,低溫進行之三成分反應中,卻生成(η^5-C_9H_7)Fe(CO)(PPh_3)C(O)Me(31.7 %)和(η^4-β-exo-MeC_9H_7)Fe(CO)_2PPh_3(< 1 %)。此等差異性歸因於茚基的環溜滑現象。(η^4-β-exo-MeC_9H_7)Fe(CO)_2PPh_3的X光分子構造顯示其六環的鍵結是定域的。

關鍵字

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並列摘要


The three-component reaction of (η^5-C_5H_5)Fe(CO)_2l and MeLi in the presence of PPh3 at low temperature yields the ring-alkylation product (η^4-exo-Me C_5H_5)Fe(CO)_2PPh_3 (77.8%). Similar reaction of (η^5-C_9H_7)Fe(CO)_2l and MeLi in the presence of PPh_3 at low temperature yields instead (η^5-C_9H_7)Fe(CO)(PPh_3)C(O)Me (31.7%) and (η^4-β-exo-Me C_9H_7)Fe(CO)_2 PPh_3 (< 1%), the difference being attributed to the ring slippage of indenyl group. The X-ray structure of (η^4-β-exo-MeC_9H_7)Fe(CO)_2 PPh_3 exhibits a bond localization on its benzo ring.

並列關鍵字

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