Aluminum Metal–Organic Framework-Ligated Single-Site Nickel(II)-Hydride for Heterogeneous Chemoselective Catalysis
作者:Neha Antil、Ajay Kumar、Naved Akhtar、Rajashree Newar、Wahida Begum、Ashutosh Dwivedi、Kuntal Manna
DOI:10.1021/acscatal.0c04379
日期:2021.4.2
and heterogeneous earth-abundant metal catalysts is essential for environmentally friendly chemical synthesis. We report a highly efficient, chemoselective, and reusable single-site nickel(II) hydride catalyst based on robust and porous aluminum metal–organic frameworks (MOFs) (DUT-5) for hydrogenation of nitro and nitrile compounds to the corresponding amines and hydrogenolysis of arylethers under
化学选择性的和非均质的富含地球的金属催化剂的开发对于环境友好的化学合成至关重要。我们报告了一种高效,化学选择性和可重复使用的单中心氢化镍(II)氢化物催化剂,该催化剂基于坚固且多孔的铝金属有机骨架(MOFs)(DUT-5),用于将硝基和腈化合物加氢成相应的胺并进行氢解温和条件下制备芳基醚。镍-氢化物催化剂的制备是通过的氢氧化铝次级结构单元的金属化的Al具有(μ的式DUT-5的(事业部)2 -OH)(BPDC)(BPDC = 4,4'-联苯双酯)与NIBR 2然后与NaEt 3反应BH。DUT-5-NiH具有广泛的底物范围,在1 bar H 2下氢化芳族和脂肪族硝基和腈化合物时,具有出色的官能团耐受性至少可以回收再利用10次。通过改变腈氢化的反应条件,还选择性地提供了对称或不对称的仲胺。实验和计算研究表明,在营业额限制步骤中,镍与镍的可逆腈配位是可逆的,然后将1,2-的配位腈插入氢化镍中。此
Chemoselective flow hydrogenation approaches to isoindole-7-carboxylic acids and 7-oxa-bicyclio[2.2.1]heptanes
作者:L. Hizartzidis、M. Tarleton、C. P. Gordon、A. McCluskey
DOI:10.1039/c3ra47657j
日期:——
nitrile reduction was achieved in the presence of furan moieties by employing a RANEY® nickel catalyst. In total, 31 reaction conditions were examined using less than 200 mg of reagents allowing optimised conditions to be efficiently determined. These optimised hydrogenation conditions afforded desired analogues in near quantitative yields thus removing the requirements of reaction workup and chromatography
Intra-molecular Diels–Alder reactions of citraconamic acids from furfurylamines and citraconic anhydride: effects of substitution in the furan ring on regioselectivity
作者:Rajappa Murali、H Surya Prakash Rao、Hans W Scheeren
DOI:10.1016/s0040-4020(01)00175-2
日期:2001.4
Regioselectivity in the intra-molecular Diels–Alder (IMDA) reaction of furfurylcitraconamic acids derived from N-benzylfurfurylamines and citraconic anhydride can be controlled by substituents located in the furan ring and by reaction conditions. Reactions conducted under kinetic conditions resulted in cycloaddition products having methyl and aminomethylene substituent in 1,3-relationship whereas under
Unexpected rearrangement of intramolecular Diels-Alder adducts of citraconic anhydride and secondary furfuryl amines
作者:Rajappa Murali、Hans W. Scheeren
DOI:10.1016/s0040-4039(99)00316-0
日期:1999.4
The intramolecular Diels-Alder reactions of citraconic anhydride with several secondary furfuryl amines have been studied at different temperatures. At high temperatures, only a single cycloadduct was isolated, whilst at room temperature, a mixture of two regioisomeric adducts were formed. One of the regioisomers rearranged to another when heated in a solvent. Some aspects of the mechanism were investigated
Synthesis and spectral studies on Ni(II) complexes involving N-furfuryl-N-substituted benzyldithiocarbamates and PPh<sub>3</sub>: Anagostic and C–H<sup>…</sup>π(chelate) interactions in (N-furfuryl-N-(4-fluorobenzyl)dithiocarbamato-S,S′)(thiocyanato-N)(triphenylphosphine)nickel(II)
作者:E. Sathiyaraj、S. Thirumaran、Samuele Ciattini
DOI:10.1080/10426507.2015.1135150
日期:2016.7.2
of dithiocarbamate ligands. Electronic spectralstudies on complexes 1-12 indicate square planar geometry around the nickel(II) central atom. In the 13C NMR spectra, the upfield shift of NCS2 carbon signal for heteroleptic complex (7-12) compared to homoleptic complexes (1-6) is due to the effect of PPh3 on the mesomeric drift of electron density toward nickel through thioureide C-N bond. Single crystal