87884-66-0Relevant articles and documents
Highly efficient aerobic oxidation of various amines using Pd3Pb intermetallic compounds as catalysts
Furukawa, Shinya,Suga, Akifusa,Komatsu, Takayuki
, p. 3277 - 3280 (2014)
Intermetallic Pd3Pb supported on Al2O3 can act as a highly efficient heterogeneous catalyst for the oxidation of various amines including primary, secondary, aromatic, aliphatic, and cyclic amines. The Royal Society of Chemistry 2014.
Enantioselective Formal Vinylogous N-H Insertion of Secondary Aliphatic Amines Catalyzed by a High-Spin Cobalt(II) Complex
Yang, Wei,Pu, Maoping,Lin, Xiaobin,Chen, Min,Song, Yanji,Liu, Xiaohua,Wu, Yun-Dong,Feng, Xiaoming
supporting information, p. 9648 - 9656 (2021/07/19)
Vinylcarbene insertion into the nitrogen-hydrogen (N-H) bond of amines allows direct access to α,β-unsaturated γ-amino acid derivatives, meeting a marked challenge in the control of regio- and enantioselectivities. Here, we report a highly γ-selective and enantioselective insertion into N-H bonds of aliphatic or aromatic secondary amines with vinyl substituted α-diazo pyrazoleamides using a high-spin chiralN,N′-dioxide/cobalt(II) complex catalyst. The method affords a wide variety of valuable optically activeZ- andE-type vinyl γ-amino amides. Calculation reveals a spin state change from the quartet cobalt(II) complex to a doublet Co(II)-carbene species for facileZ-selective and enantioselective nucleophilic addition.
Mechanistic study on aerobic oxidation of amine over intermetallic Pd3Pb: Concerted promotion effects by Pb and support basicity
Furukawa, Shinya,Suga, Akifusa,Komatsu, Takayuki
, p. 1214 - 1222 (2015/03/04)
A mechanistic study on aerobic oxidation of amine to imine over Pd3Pb/MOx (MOx = SiO2, TiO2, Al2O3, and MgO) intermetallic catalysts was performed to clarify the role of Pb and the support in enhancing catalytic activity. Results from X-ray absorption and photoelectron spectroscopies revealed that formation of the Pd3Pb phase made Pd electron-rich compared to pure Pd, whereas the electronic states of Pd in Pd3Pb/MOx were identical and independent of the nature of the support. Kinetic studies indicated that desorption of imine was promoted by Pb and that adsorption of amine was accelerated by basic sites on the support. Infrared temperature programmed desorption (IR-TPD) experiments demonstrated that desorption of imine was indeed promoted on Pd3Pb compared to Pd. The support effect only appears on Pd3Pb catalysts and not on pure Pd due to change in the rate-determining step from imine desorption to amine adsorption. The combination of Pb and the support basicity provides a unique and highly efficient bifunctional catalysis. (Chemical Equation Presented).
