Marlex Catalyst Systems

Clark, Alfred; Hogan, J. P.; Banks, R. L.; Lanning, W. C.

doi:10.1021/ie50559a021

Cited by 129 publications

(25 citation statements)

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“…Notably, propylene polymerization catalysts have rarely been used in the stereoselective oligomerization for synthesis of short oligomers, despite the great effort that has been devoted to the development of both homogeneous and heterogeneous catalysts for the highly isoselective propylene polymerization (14,15). In 1987, Pino et al reported an asymmetric propylene oligomerization catalyzed by enantiomerically pure chiral zirconocene in the presence of dihydrogen to afford saturated isotactic oligopropylenes (16).…”

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confidence: 99%

One-step catalytic asymmetric synthesis of all- syn deoxypropionate motif from propylene: Total synthesis of (2 R ,4 R ,6 R ,8 R )-2,4,6,8-tetramethyldecanoic acid

Ota

Murayama

Nozaki

2016

Proc. Natl. Acad. Sci. U.S.A.

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In nature, many complex structures are assembled from simple molecules by a series of tailored enzyme-catalyzed reactions. One representative example is the deoxypropionate motif, an alternately methylated alkyl chain containing multiple stereogenic centers, which is biosynthesized by a series of enzymatic reactions from simple building blocks. In organic synthesis, however, the majority of the reported routes require the syntheses of complex building blocks. Furthermore, multistep reactions with individual purifications are required at each elongation. Here we show the construction of the deoxypropionate structure from propylene in a single step to achieve a three-step synthesis of (2R,4R,6R,8R)-2,4,6,8-tetramethyldecanoic acid, a major acid component of a preen-gland wax of the graylag goose. To realize this strategy, we focused on the coordinative chain transfer polymerization and optimized the reaction condition to afford a stereo-controlled oligomer, which is contrastive to the other synthetic strategies developed to date that require 3–6 steps per unit, with unavoidable byproduct generation. Furthermore, multiple oligomers with different number of deoxypropionate units were isolated from one batch, showing application to the construction of library. Our strategy opens the door for facile synthetic routes toward other natural products that share the deoxypropionate motif.

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confidence: 99%

One-step catalytic asymmetric synthesis of all- syn deoxypropionate motif from propylene: Total synthesis of (2 R ,4 R ,6 R ,8 R )-2,4,6,8-tetramethyldecanoic acid

Ota

Murayama

Nozaki

2016

Proc. Natl. Acad. Sci. U.S.A.

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“…To make the catalyst, the carrier is impregnated with a chromium compound followed by calcination in dry air or oxygen to ''activate'' the catalyst. [2][3][4] During this activation, chromium becomes oxidized to Cr(VI), which reacts with surface hydroxyl groups to become anchored and monodispersed. This process stabilizes the Cr(VI) against thermal decomposition.…”

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confidence: 99%

Preparation, characterization, and polymerization of chromium complexes‐grafted Al/SBA‐15 and Ti/SBA‐15 nanosupports

Ahmadi

Mohamadnia

Mashhadi-Malekzadeh

et al. 2012

J of Applied Polymer Sci

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Ethylene polymerization catalysts have been prepared by grafting chromium (III) nitrate onto Al/SBA-15 and Ti/SBA-15 mesoporous materials. A combination of XRD, nitrogen adsorption, TEM, and inductively coupled plasma-atomic emission spectroscopy (ICP-AES), were used to characterize the catalysts. Polymerization activity of Cr/SBA-15 catalyst is significantly improved by Al or Ti insertion to the supports. Particularly, the chromium catalyst prepared with Ti/SBA-15 support is more active than Al/SBA-15 catalyst.

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“…Linear or high-density polyethylene (HDPE) was invented in the early 1950s as a result of three independent catalyst discoveries in three separate locations using three different transition metals [2][3][4][5][6][7][8][9]. Some details of these three discoveries are given in Table 1.…”

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confidence: 99%

Review of the Phillips Chromium Catalyst for Ethylene Polymerization

McDaniel

2008

Handbook of Heterogeneous Catalysis

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The year 2001 marked the 50th anniversary of the discovery of the Phillips chromium catalyst, from which today's worldwide high‐density polyethylene industry sprang. Appropriately, during that year the discoverers of this catalyst system, J. Paul Hogan and Robert L. Banks, were inducted into the National Inventors Hall of Fame, in Akron, OH, to join other distinguished inventors spanning two centuries who have shaped our world. This chapter reviews our understanding of the chemistry associated with that catalyst system, which is used globally to produce perhaps half of the world's high‐density polyethylene, and it provides examples of how that chemistry is exploited commercially.

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Marlex Catalyst Systems

Cited by 129 publications

References 1 publication

One-step catalytic asymmetric synthesis of all- syn deoxypropionate motif from propylene: Total synthesis of (2 R ,4 R ,6 R ,8 R )-2,4,6,8-tetramethyldecanoic acid

One-step catalytic asymmetric synthesis of all- syn deoxypropionate motif from propylene: Total synthesis of (2 R ,4 R ,6 R ,8 R )-2,4,6,8-tetramethyldecanoic acid

Preparation, characterization, and polymerization of chromium complexes‐grafted Al/SBA‐15 and Ti/SBA‐15 nanosupports

Review of the Phillips Chromium Catalyst for Ethylene Polymerization

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