67654-84-6Relevant academic research and scientific papers
Fine-tuning dirhodium compounds with bridging ligands: Synthesis, structure, catalytic efficiency
Ning, Yangbo,Tan, Jiantao,Wang, Yuanhua,Wang, Zhifan
supporting information, (2021/09/28)
The structure of dirhodium compounds contains a unique Rh-Rh bond, two axial ligands and four bridging ligands. In the dirhodium(II) compounds, it is easy to migrate the coordinating atoms of the bridging ligand during the catalysis process, which leads to the degradation of the catalyst. Coordination atom migration was identified in bridging ligands. To improve the catalyst stability, we carried out a study on the effect of fine-tuning of the bridging ligand on the dirhodium compound. Several dirhodium compounds were designed and synthesized. During this process, we have successfully found Rh2(5-Br-esp)2 and Rh2(5-tBu-esp)2, which are closer to the ideal geometric configuration of the dirhodium(II) compounds. Rh2(5-Br-esp)2 has been applied in the oxidation of propargyl position and Rh2(5-tBu-esp)2 in the formation reaction of the C–N bond.
Ring-opening of lactones with alkynyltrifluoroborates: A new route to functionalized α-alkynones
Doubsky, Jan,Streinz, Ludvík,Le?eticky, Ladislav,Koutek, Bohumír
, p. 937 - 942 (2007/10/03)
Alkynyltrifluoroborate salts, readily generated in situ by the addition of BF3·OEt2 to alkynyllithiums, were shown to mediate the regioselective acyl C-O ring cleavage of 5-, 6-, and 7-membered lactones. This novel, operationally sim
An Efficient Synthesis of Acetylenic γ- and δ-Hydroxy Ketones, γ- and δ-Keto Acids, and γ-Diketones via Addition of 1-Alkinyllithium Compounds to γ- and δ-Lactones
Wedler, Christine,Schick, Hans
, p. 410 - 414 (2007/10/02)
2-Hydroxy-6-alkyn-5-ones 3, 1-hydroxy-5-alkyn-4-ones 4, and 1-hydroxy-6-alkyn-5-ones 5 are conveniently obtained in exellent yields through a highly selective monoaddition of an 1-alkynyllithium compound 2 to γ-valerolactone (1a), γ-butyrolactone (1b) or
