高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (10): 1076.

• 研究论文 • 上一篇    下一篇

二苄基二茂钛的羰基化反应

王积涛, 王永梅, 王庆喜   

  1. 南开大学化学系
  • 收稿日期:1989-06-28 出版日期:1990-10-24 发布日期:1990-10-24
  • 通讯作者: 王永梅, 邮编: 300071
  • 基金资助:

    国家自然科学基金

Carbonylation of Bis(Cyclopcntadicnyl)-Bis(Substituted benzyl) Titanium

Wang Jitao, Wang Yongmei, Wang Qingxi   

  1. Department of Chemistry, Nankai University, Tianjin
  • Received:1989-06-28 Online:1990-10-24 Published:1990-10-24

摘要: 用取代的二苄基二茂钛与一氧化碳在正庚烷中反应,生成二羰基二茂钛和二苄基甲酮。通过光谱监测,发现1摩尔一氧化碳插入碳钛键,得到取代的苯乙酰基苄基二茂钛。反应随着取代基给电子能力的增加而加快(Me>t-Bu≈H>F>Cl)。中间体Cp2Ti[C(O)CH2Ph]CH2Ph很活泼,迅速发生分子内消除,消除的苄基和苯乙酰基生成二苄基酮。

关键词: 羰基化, 二苄基甲酮, 二苄基二茂钛

Abstract: Para-substituted bis (benzyl) bis (cyclopentadienyl) titanium complexes reacted with carbon monoxide in n-pentane, producing bis (cyclopentadienyl) dicarbonyl titanium and sym-dibenzyl ke-tone. By means of spectrometric monitoring technique, it is suggested that one molecule of COinserting into the Ti-C σ-bond to form the unstable phenylacetyl-benzyl-bis (cyclopentadienyl) titanium. The intermediate Cp2Ti(C(O)CH2Ph)CH2Ph is labile and quickly eliminates benzyl and phenylacetyl group to produce dibenzyl ketone. The reaction velocity is enhanced by the presence of electron donating group on the phenyl ring (Me>t-Bu>H>F>Cl).

Key words: Carbonylation, Dibenzyl ketone, Bis(benzyl)bis(cyelopentadienyl) titanium

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