- NOVEL LINEAR ALPHA-OLEFIN CATALYSTS AND PREPARATION AND USE THEREOF
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The present invention relates to a novel linear a-olefin catalyst composition, and preparation and use thereof. The catalyst composition includes a main catalyst and a co-catalyst, wherein the main catalyst is an imino-based iron coordination compound, and the co-catalyst is a mixture of methylaluminoxane, triisobutylaluminum, and borane or GaCl3. The catalyst composition can be used to catalyze ethylene oligomerization to produce linear α-olefins having a selectivity of greater than 96%, carbon distribution between C4-C28 with the component of C6-C20 being greater than 75%. The catalyst of the invention is stable in structure and can be used for ethylene oligomerization with high catalytic efficiency. The method of the invention has the advantages of relatively convenient in operation, readily available of raw materials, high yield, low costs, less pollution and easy for industrial production.
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Paragraph 0033; 0034
(2018/06/09)
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- Design and development of macrocyclization methods for compounds with potential tuberculocidal activity to decrease CYP450 liver cytochrome inhibition
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A procedure for macrocyclization of compounds with potential tuberculocidal activity was developed in order to obtaining compounds with a lower degree of inhibition of the key CYP 3A4 cytochrome.
- Vasilevich,Aksenova,Aksenova,Afanasyev
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p. 717 - 730
(2017/05/29)
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- Convenient and Multistep Preparation of Oligopyridines Bearing Multiple Dansyl and Nitroxide Radicals
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A series of pyridine and bipyridine molecules combining dual fluorescent (dansyl) and magnetic (free radical) probes has been prepared by a linear multistep protocol from the corresponding monodansylated derivatives. The grafting of the flexible aliphatic radical is realized by the use of a chloromethylnitronyl nitroxide derivative under basic conditions and with KI as a mediator. The synthetic potential of 2-[(5-dimethylamino-1-naphthalenesulfonamide)methyl]-6-formylpyridine is assessed by the construction, in a first step, of an aliphatic nitroxide radical and subsequently of an additional aromatic radical. The synthetic methods reported herein provide a practical approach to the rational design of ligands bearing various kinds of functionalities such as chromogenic and spinlabeled fragments. A significant merit of this method is that it allows the introduction of the fluorescent substituent onto the pyridine or bipyridine framework at the beginning of the synthetic protocol.
- Ziessel, Raymond,Stroh, Christophe
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p. 2145 - 2154
(2007/10/03)
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- Functional Micellar Catalysis. Part 8. Catalysis of the Hydrolysis of p-Nitrophenyl Picolinate by Metal-chelating Micelles containing Copper(II) or Zinc(II)
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The kinetic analysis of the esterolysis of p-nitrophenyl picolinate in neutral aqueous solutions of Cu2+ and Zn2+ in the presence of co-micelles made up of cetyltrimethylammonium bromide and either 6-(myristoylamido)methylpyridine-2-
- Fornasier, Roberto,Milani, Daria,Scrimin, Paolo,Tonellato, Umberto
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p. 233 - 238
(2007/10/02)
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