Reductive Elimination to Form C(sp<sup>3</sup>)–N Bonds from Palladium(II) Primary Alkyl Complexes
作者:D. Matthew Peacock、Quan Jiang、Thomas R. Cundari、John F. Hartwig
DOI:10.1021/acs.organomet.8b00617
日期:2018.10.8
Reductiveeliminations to form alkyl–nitrogen bonds are rare, and examples of this reaction from isolated complexes containing simple, unstabilized primary alkyl groups have not been observed. We report the synthesis of stable neopentylpalladium(II) anilido and methyleneamido complexes that undergo reductiveelimination to form the C(sp3)–N bonds in N-neopentyl anilines and N-neopentyl imines, respectively
Reductive Elimination from Phosphine-Ligated Alkylpalladium(II) Amido Complexes To Form sp<sup>3</sup> Carbon–Nitrogen Bonds
作者:D. Matthew Peacock、Quan Jiang、Patrick S. Hanley、Thomas R. Cundari、John F. Hartwig
DOI:10.1021/jacs.8b00928
日期:2018.4.11
containing a series of electronically and sterically varied anilido ligands showed that the reductive elimination is slower from complexes of less electron-rich or more stericallyhindered anilido ligands than from those containing more electron-rich and less hindered anilido ligands. Reductive elimination of alkylamines also occurred from complexes bearing bidentate P,O ligands. The rates of reactions of
我们报告了膦配位烷基钯 (II) 氨基配合物的形成,这些配合物经过还原消除以形成烷基-氮键,并对控制这些反应速率的因素进行了实验和计算研究。从 t-Bu3P 连接的复合物中还原消除的自由能垒明显低于先前报道的 NHC 连接的复合物的自由能垒(约 3 kcal/mol)。含有一系列电子和空间变化的苯胺基配体的配合物的反应速率表明,与含有较多电子和较少受阻苯胺基配体的配合物相比,较少富电子或空间位阻较多的苯胺基配体的还原消除较慢。烷基胺的还原消除也发生在带有二齿 P 的配合物中,O配体。这些四配位配合物的反应速率比三配位、t-Bu3P-连接配合物的反应速度慢。从刚性的 2-甲氧基芳基膦配体复合物中还原消除的计算途径不涉及氧的初始解离。相反,还原消除被计算为直接从四配位配合物中发生,与 Pd-O 键的延长相一致。为了通过实验研究这种效应,合成了一种四配位 Pd(II) 苯胺络合物,该复合物在 P