Related Products of 638-07-3, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 638-07-3, Name is Ethyl 4-chloro-3-oxobutanoate, SMILES is O=C(OCC)CC(CCl)=O, belongs to chlorides-buliding-blocks compound. In a article, author is de Oliveira, L. L., introduce new discover of the category.
Chromium complexes of general formula [Cr{ZNO}(THF)Cl-2] [2a, ZNO = C9H6N-8-(N=CH)-2,4-tert-butyl-2-(OC6H2); 2b, ZNO = Ph(NH)-C2H4-(N=CH) 2,4-tert-butyl-2-(OC6H2); 2c, ZNO = 2 MeO-Ph-CH2-(N=CH)-2,4-tert-butyl-2-(OC6H2); 2d, ZNO = 2-PhO-Ph-(N=CH)-2,4-tert-butyl-2-(OC6H2); 2e, ZNO = PhO-C2H4-(N=CH)-2,4-tert-butyl-2-(OC6H2)] and the bis(ligand) complex [Cr{C9H6N-8-NH2}(2)Cl-2]Cl (4) were synthetized and characterized by elemental analysis, IR spectroscopy, and by X-ray crystallography for 4. In the solid state, 4 is monomeric with two 8-amino-quinoline acting as bidentate ligands and two chloride ligands in cis position. The DFT calculations showed slightly higher HOMO energy for 2d. In addition, the energy levels of the LUMO are slightly influenced by pendant O- and N-donor group. Particularly, the LUMOs for complexes 2a and 2d show a small contribution from Cr and Cl atoms as compared to other chromium complexes (2b, 2c and 2e), and the orbitals are almost entirely delocalized over the phenoxy-imine unit. Upon activation with methylaluminoxane (MAO), chromium precatalysts 2a-2e showed good activity in ethylene oligomerization (TOF = 22.0 – 52.7 x 10(3) (mol ethylene)(mol Cr)(-1) .h(-1) at 80 degrees C) with Schultz-Flory distribution of oligomers (KC4-C10 approximate to 0.92), and production of polymer varying from 2.9 to 22.3 wt.%. The catalytic performance is mainly controlled by electronic effects at the phenoxyimine ligands. The bis(ligand) chromium complex 4 showed good activity in ethylene oligomerization (TOF = 39,400 (mol ethylene)(mol Cr)(-1) h(-1)), producing mostly oligomers (95.2 wt% of total products) with high selectivity for alpha-olefins. The highest activity among the six precatalysts screened was reached with 2c (TOF = 52,700 mol(ethylene).mol(Cr)(-1) h(-1)). (C) 2021 Elsevier B.V. All rights reserved.
Related Products of 638-07-3, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 638-07-3 is helpful to your research.
Reference:
Chloride – Wikipedia,
,Chlorides – an overview | ScienceDirect Topics