A chromium precursor for the Phillips ethylene trimerization catalyst: (2-ethylhexanoate)2CrOH.

Title A chromium precursor for the Phillips ethylene trimerization catalyst: (2-ethylhexanoate)2CrOH.
Authors J.Yeob Jeon; D.Sik Park; D.Hwan Lee; S.Chan Eo; S.Yeon Park; M.Sun Jeong; Y.Young Kang; J. Lee; B.Yeoul Lee
Journal Dalton Trans
DOI 10.1039/c5dt01203a
Abstract

The conventional Phillips ethylene trimerization catalyst prepared by reacting Cr(EH)3 (EH = 2-ethylhexanoate), 2,5-dimethylpyrrole (Me2C4H2NH), Et3Al, and Et2AlCl in an aromatic hydrocarbon solvent was improved to obtain a congener composed of a new chromium precursor (EH)2CrOH, (Me2C4H2N)AlEt2, and Et3Al·ClAlEt2. Reaction of CrCl3 with 3 equiv. Na(EH) in water did not generate Cr(EH)3, but unexpectedly produced (EH)2CrOH. In comparison with the erratic catalytic performance of the original Phillips system, due to the ill-defined nature of the Cr(EH)3 source (16 or 6.8 × 10(6) g per mol-Cr h depending on the source), the improved system exhibited consistently high activity (54 × 10(6) g per mol-Cr h). Reaction of (EH)2CrOH with (Me2C4H2N)AlMe2·OEt2 afforded the dimeric Cr(II)-complex (6) coordinated by (?(5)-Me2C4H2N)AlMe2(NC4H2Me2) and ?2-?(1):?(2)-Me2C4H2N ligands. 6 provided highly active species when activated with Et3Al·ClAlEt2.

Citation J.Yeob Jeon; D.Sik Park; D.Hwan Lee; S.Chan Eo; S.Yeon Park; M.Sun Jeong; Y.Young Kang; J. Lee; B.Yeoul Lee.A chromium precursor for the Phillips ethylene trimerization catalyst: (2-ethylhexanoate)2CrOH.. Dalton Trans. 2015;44(24):1100412. doi:10.1039/c5dt01203a

Related Elements

Chromium

24 Cr 51.996100000 Chromium

See more Chromium products. Chromium (atomic symbol: Cr, atomic number: 24) is a Block D, Group 6, Period 4 element with an atomic weight of 51.9961. Chromium Bohr ModelThe number of electrons in each of Chromium's shells is 2, 8, 13, 1 and its electron configuration is [Ar] 3d5 4s1. Louis Nicolas Vauquelin first discovered chromium in 1797 and first isolated it the following year. The chromium atom has a radius of 128 pm and a Van der Waals radius of 189 pm. In its elemental form, chromium has a lustrous steel-gray appearance. Elemental ChromiumChromium is the hardest metallic element in the periodic table and the only element that exhibits antiferromagnetic ordering at room temperature, above which it transforms into a paramagnetic solid. The most common source of chromium is chromite ore (FeCr2O4). Due to its various colorful compounds, Chromium was named after the Greek word 'chroma.' meaning color.

Related Forms & Applications

Ethylhexanoates Organometallics
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