Intermolecular C-H bond activation promoted by a titanium alkylidyne

Intermolecular C-H bond activation promoted by a titanium alkylidyne
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DOI:
10.1021/ja0556934
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发表时间:
2005-11-23
影响因子:
15
通讯作者:
Mindiola, DJ
Mindiola, DJ
中科院分区:
化学1区
文献类型:
--
作者:
Bailey, BC;Fan, HJ;Mindiola, DJ

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过渡态烷基钛配合物(PnP)Ti⋮CtBu(PnP=N-[2-P(CHMe2)2-4-甲基苯基]2-)是由相应的亚烷基−烷基物种(PnP)TiCHtBu(CH2tBu)通过⋮-氢抽提得到的,可以很容易地进行苯和SiMe4的C-α-H键的分子间1,2-加成反应。合成和反应活性、同位素标记、动力学和理论研究强烈支持烷基途径和α-H提取步骤作为速率决定步骤。
The transient titanium alkylidyne complex (PNP)Ti⋮CtBu (PNP =N-[2-P(CHMe2)2-4-methylphenyl]2-), prepared from α-hydrogen abstraction of the corresponding alkylidene−alkyl species (PNP)TiCHtBu(CH2tBu), can readily undergo intermolecular 1,2-addition of C−H bonds of benzene and SiMe4. Synthesis and reactivity, isotopic labeling, kinetics, and theoretical studies strongly favor an alkylidyne pathway and the α-H abstraction step to be the rate-determining step.