617-84-5Relevant articles and documents
Saegusa et al.
, p. 3379 (1968)
Mesoporous Sn(IV) Doping DFNS Supported BaMnO3 Nanoparticles for Formylation of Amines Using Carbon Dioxide
Yang, Jie,Wang, Liujie,Sun, Aili,Zhiani, Rahele
, p. 573 - 581 (2020/07/27)
Abstract: In the present paper, Sn(IV) doping DFNS (SnD) supported nanoparticles of BaMnO3 (BaMnO3/SnD) and using as a catalyst for the N-formylation of amines by CO2 hydrogenation. In this catalyst, the SnD with the ratios of Si/Sn in the range of from 6 to 50 were obtained with method of direct hydrothermal synthesis (DHS) as well as the nanoparticles of BaMnO3 were on the surfaces of SnD in situ reduced. Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) were utilized for characterizing the nanostructures BaMnO3/SnD. It is found that the nanostructures of BaMnO3/SnD can be a nominate due to its effective and novel catalytic behavior in N-formylation of amines through hydrogenation of CO2. Graphic Abstract: [Figure not available: see fulltext.]
A N-Phosphinoamidinato NHC-Diborene Catalyst for Hydroboration
Fan, Jun,Mah, Jian-Qiang,Yang, Ming-Chung,Su, Ming-Der,So, Cheuk-Wai
, p. 4993 - 5002 (2021/02/01)
The use of the N-phosphinoamidinato NHC-diborene catalyst 2 for hydroboration is described. The N-phosphinoamidine tBu2PN(H)C(Ph)= N(2,6-iPr2C6H3) was reacted with nBuLi in Et2O to afford the lithium derivative, which was then treated with B2Br4(SMe2)2 in toluene to form the N-phosphinoamidinate-bridged diborane 1. It was reacted with the N-heterocyclic carbene IMe (:C{N(CH3)C(CH3)}2) and excess potassium graphite at room temperature in toluene to give the N-phosphinoamidinato NHC-diborene compound 2. It can stoichiometrically activate ammonia-borane and carbon dioxide. It also showed catalytic capability. A 2 mol % portion of 2 catalyzed the hydroboration of carbon dioxide (CO2) with pinacolborane (HBpin) in deuterated benzene (C6D6) at 110 °C (conversion >99%), which afforded the methoxyborane [pinBOMe] (yield 97.8%, TOF 33.3 h-1) and the bis(boryl) oxide [(pinB)2O]. In addition, 5 mol % of 2 catalyzed the N-formylation of secondary and primary amines by carbon dioxide and pinacolborane to yield the N-formamides (average yield 91.6%, TOF 25.9 h-1). Moreover, 2 showed chemoselectivity toward catalytic hydroboration of carbonyl compounds. In mechanistic studies, the B= B double bond in compound 2 activated the substrates, the intermediates of which then underwent hydroboration with pinacolborane to yield the products and regenerate catalyst 2.