A method for the selectivedeuteration of polyfunctional organic molecules using catalytic amounts of [RuCl2 (PPh3 )3 ] and D2 O as a deuteriumsource is presented. Through variation of additives like CuI, KOH, and various amounts of zinc powder, orthogonal chemoselectivities in the deuteration process are observed. Mechanistic investigation indicates the presence of different, defined Ru-complexes
Reduction of alkynes into 1,2-dideuterioalkenes with hexamethyldisilane and deuterium oxide in the presence of a palladium catalyst
作者:Eiji Shirakawa、Hidehito Otsuka、Tamio Hayashi
DOI:10.1039/b512245g
日期:——
A combination of hexamethyldisilane and deuterium oxide was found to work as a deuterium transfer reagent for alkynes in the presence of a catalytic amount of a palladium complex to give (E)-1,2-dideuterioalkenes selectively through the corresponding (Z)-isomer.
A Single Terminal [NiII−OH] Catalyst for Direct Julia‐Type Olefination and α‐Alkylation Involving Sulfones and Alcohols
作者:Prabhakar K. Pandey、Moumita Patra、Prabodh Ranjan、Nilay Kumar Pal、Sanjay Choudhary、Jitendra K. Bera
DOI:10.1002/chem.202400337
日期:2024.6.20
A single terminal [NiII−OH] catalyst is employed for direct Julia-type olefination of alcohols and α-alkylation of sulfones using different reaction conditions. Detailed mechanistic studies, including DFT calculations, are undertaken to gain insight on the reaction pathway.
使用单末端[Ni II -OH]催化剂,使用不同的反应条件进行醇的直接Julia型烯化和砜的α-烷基化。进行详细的机理研究,包括 DFT 计算,以深入了解反应途径。
Formate-Mediated Reductive Cross-Coupling of Vinyl Halides and Aryl Iodides: cine-Substitution via Palladium(I) Catalysis
作者:Catherine G. Santana、Yhin Sarah Teoh、Madeline M. Evarts、Jonathan Z. Shezaf、Michael J. Krische
DOI:10.1021/acs.orglett.4c02642
日期:2024.8.23
Formate-mediated reductive cross-couplings of vinylhalides with aryl iodides via palladium(I) catalysis occur with highly uncommon cine-substitution. The active dianionic palladium(I) catalyst, [Pd2I4][NBu4]2, is generated in situ from Pd(OAc)2, Bu4NI, and formate. Oxidative addition of aryl iodide followed by dissociation of the dimer provides the monomeric anionic T-shaped arylpalladium(II) species
甲酸盐介导的乙烯基卤化物与芳基碘化物通过钯 (I) 催化的还原叉偶联以非常罕见的 cine 取代发生。活性二离子钯 (I) 催化剂 [Pd2I4][NBu4]2 由 Pd(OAc)2、Bu4NI 和甲酸盐原位生成。芳基碘化物的氧化加成,然后二聚体解离,产生了单体阴离子 T 形芳钞 (II) 物种 [Pd(Ar)(I)2(NBu4)],它在乙烯基卤化物碳钯化后通过钯 (IV) 卡宾形成电影取代产物,氘标记实验证实了这一点。