Sodium Butylated Hydroxytoluene (NaBHT) as a New and Efficient Hydride Source for Pd‐Catalysed Reduction Reactions
作者:Sepideh Sharif、Michael J. Rodriguez、Yu Lu、Michael E. Kopach、David Mitchell、Howard N. Hunter、Michael G. Organ
DOI:10.1002/chem.201902876
日期:2019.10.11
for the efficient arylation of various base-sensitive amines and (hetero)aryl halides has been found to have an unanticipated role as a hydride donor to reduce (hetero)aryl halides and allylic acetates. Mechanisticstudies have uncovered that NaBHT, but not BHT, can deliver multiple hydrides through oxidation of the benzylic methyl group in NaBHT to the aldehyde. Further, performing the reduction with
NaBHT Generated <i>In Situ</i> from BHT and NaO<i>t</i>Bu: Crystallographic Characterization and Applications in Buchwald–Hartwig Amination
作者:Volodymyr Semeniuchenko、Jeffrey S. Ovens、Wilfried M. Braje、Michael G. Organ
DOI:10.1021/acs.organomet.1c00386
日期:2021.10.11
BHT with tBuONa in solution and in the solid state were examined, reveraling that NaBHT does not need to be prepared from pyrophoric NaH or metallic Na every time. Instead, it can be generated efficiently in or ex situ using NaOtBu in solution or with only a stoichiometric amount of solvent to assist in bringing the reactants together. Application of this methodology was demonstrated with the efficient
NaBHT 是一种有价值的中等强度基料,可用于许多应用,尤其是 Buchwald-Hartwig 耦合。使用单晶 X 射线衍射建立了无溶剂 NaBHT 及其与 Et 2 O、THF、t BuOH 和 THF/ t BuOH 混合物的溶剂化物的结构。[NaBHT·Et 2 O] 2采用二聚体结构并在单斜晶胞中结晶,[NaBHT·THF] 3、[NaBHT· t BuOH] 3和[NaBHT·(THF- t BuOH)] 3更喜欢三聚体结构并在立方晶胞中结晶。无溶剂 [NaBHT] n不同于溶剂化的 NaBHT 和其他已知的苯酚钠。它是一种无机聚合物,在正交晶胞中结晶,NaO 核沿 [1 0 0] 方向扩展。所有结构都证实了t Bu 基团氢与 Na 的主动相互作用,可能有助于解释 NaBHT 的还原特性。此外,研究了 BHT 与t BuONa 在溶液中和固态中的相互作用,表明 NaBHT 不需要每次都从自燃的
Synthesis and characterization of trinuclear and mononuclear rare-earth metal aryloxides supported by Salpn ligand and their application for the polymerization of rac -lactide
作者:Chen Zhang、Weikai Gu、Yaorong Wang、Yingming Yao
DOI:10.1016/j.poly.2017.06.006
日期:2017.9
metal aryloxocomplexes [LRE(OAr)(HMPA)] 3 (RE = Y ( 1 ), Yb ( 2 ), Sm ( 3 )), and the mononuclear neodymium complex LNd(OAr)(HMPA) 2 ( 4 ), respectively, in good yields in the presence of HMPA (HMPA = hexamethylphosphoric triamide). Complexes 1 and 2 can also be prepared by the phenol elimination reactions of (ArO) 3 RE(THF) with LH 2 in a 1:1 M ratio or salt metathesis reaction of LLi 2 (THF) x with
Protonolysis and Amide Exchange Reactions of a Three-Coordinate Cobalt Amide Complex Supported by an N-Heterocyclic Carbene Ligand
作者:Christopher B. Hansen、Richard F. Jordan、Gregory L. Hillhouse
DOI:10.1021/ic502670x
日期:2015.5.18
trigonal-planar geometries at cobalt in the solid state. The solid-statestructure of 3 also contains a trigonal-planar cobalt center and exhibits close Co---H contacts involving the methine hydrogen atoms of the NH(DIPP) groups in the axial positions. The solid-statestructure of 5 features an interaction between cobalt and a flanking aryl group of the anilide ligand, resulting in pyramidalization of the
Samarium(III) tris(2,6-di-tert-butyl-4-methylphenoxide) (1), which is a highly coordinatively unsaturated complex, was prepared by the reaction of samarium(III) iodide with sodium 2,6-di-tert-butyl-4-methylphenoxide, and the crystal structure of its acetonitrile complex was determined by X-ray analysis. Complex 1 catalyzed the sequential Michael-Michael-aldol reaction of 3,3-dimethyl-2-butanone with