Round-Trip Oxidative Addition, Ligand Metathesis, and Reductive Elimination in a P<sup>III</sup>/P<sup>V</sup> Synthetic Cycle
作者:Soohyun Lim、Alexander T. Radosevich
DOI:10.1021/jacs.0c07580
日期:2020.9.23
metathesis, and reductive elimination at a Cs-symmetric phosphorus triamide (1, PN[o-NMe-C6H4]2}) is reported. Reaction of 1 with perfluoroarenes (ArF-F) results in C-F oxidative addition yielding fluorophosphoranes 1•[F][ArF]. The P-fluoro substituent is exchanged for hydride by treatment with DIBAL-H, generating hydridophosphoranes 1•[H][ArF]. Heating of 1•[H][ArF] regenerates 1 by C-H reductive elimination
Kinetic and stereochemical factors in the hydralumination of alkenes and the configurational stability of the resulting carbonaluminum bond
作者:John J. Eisch、Kennetih C. Fichter
DOI:10.1016/0022-328x(83)85040-2
日期:1983.7
case of the silylindene. The isomerization of the hydralumination adduct could occur either by carbonaluminum bond inversion or by dehydralumination. The former process took place readily in the absence of Lewis bases, but the latter process required elevated temperatures and protracted times. The stable cis-hydralumination adducts could be protodealuminated with retention of configuration at the CAl
为了确定立体化学,区域化学以及结构对反应性的影响,用二异丁基铝氢化物对一系列环状烯烃进行水合铝化反应。观察到的反应性等级为:> 1,1-二甲基-3-三甲基甲硅烷基茚> 1-甲基ena> 1,1-二甲基茚> 1-苯基ac→1,1-二甲基-3-苯基茚。通过在供体溶剂中工作,证明了顺式-水合铝化是动力学控制的添加方式。3-取代-1,1-二甲基茚的反应性反映了极性效应,而1-取代的反应性则反应了空间效应。除硅烷基茚的情况外,水合铝化的区域化学通常由空间因素决定。水合铝酸盐加合物的异构化可能通过碳铝键反转或脱水铝化而发生。前一种方法很容易在没有路易斯碱的情况下进行,但是后一种方法需要高温和延长时间。稳定的顺式尽管烯基体系产生了大量的1,3-二氢ac烯,但β-水合铝化加合物仍可被原脱铝,并保留CAl键的构型。通过氘标记,1 H NMR和化学降解研究阐明了这些异常水解产物的性质。为了允许进行上述研究,明确地合成了完整的C
Hydroalumination of a Dinuclear Tantalum Dinitrogen Complex: N−N Bond Cleavage and Ancillary Ligand Rearrangement
作者:Bruce A. MacKay、Brian O. Patrick、Michael D. Fryzuk
DOI:10.1021/om050208z
日期:2005.8.1
subsequently rearranges via a second thermally labile intermediate to ultimately generate two diastereomeric end products that show N−Nbond cleavage, loss of H2, loss of an aluminum isobutyl group, and NPN ligand migration from tantalum to aluminum. Both of these complexes have been isolated in crystalline form and analyzed by single-crystal X-ray diffraction. The second thermally sensitive intermediate