Olefin epoxidation catalyzed by Schiff base molybdenum (VI) complexes immobilized onto zirconium poly (styrene-phenylvinylphosphonate)-phosphate

Hu, Zhongkai; Fu, Xiangkai; Li, Yuedong

doi:10.1016/j.inoche.2011.01.010

Cited by 28 publications

References 21 publications

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Catalysis of Organic Processes by Metal Phenolates

Serra¹,

Murtinho²

2012

Patai's Chemistry of Functional Groups

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Transition metal catalysts with phenolates as ligands constitute an extensive class of complexes with application in a great variety of catalytic transformations.Because phenol groups can be sterically and electronically modified by the introduction of substituents with different characteristics, the door is opened to a myriad of catalysts with characteristics of reactivity and selectivity for promoting innumerous transformations of synthetic interest in organic chemistry. Metal phenolates have therefore become essential participants in catalytic organic synthesis, including catalytic asymmetric synthesis. Oxidations of alkenes, sulfides, alcohols and alkanes, additions of trimethylsilylcyanide, diorganozincs and nitroalkanes to CO and CN bonds and Diels–Alder reactions are some examples of the types of reactions that are promoted by these catalysts. This chapter provides an overview of recent advances in the catalysis of organic processes by metal phenolates, with emphasis on the last decade.

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Catalysis of Organic Processes by Metal Phenolates

Serra¹,

Murtinho²

2012

Patai's Chemistry of Functional Groups

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Synthesis and Characterization of Polymer Metal Complexes and Their Catalytic Activity in Ethylene Oligomerization

Ahamad

Alshehri

2013

Adv Polym Technol

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ABSTRACT:A new polymeric ligand, 4,7-dihydroxy-1,10-phenanthroline/formaldehyde polymeric ligand [poly-(DHPF)], was synthesized via the polycondensation of 4,7-dihydroxy-1,10-phenanthroline and formaldehyde in an acidic medium. Polymer metal complexes, poly-[DHPF-M(II)Cl 2 ], were subsequently prepared with Co(II) and Ni(II) ions. The synthesized polymers were characterized by elemental and spectral analyses. The polymer metal complexes were evaluated as catalyst precursors for ethylene oligomerization, using methylaluminoxane as an activator. Different Al/M [M = Co(II) and Ni(II)] ratios were investigated at two different ethylene pressures. Poly-[DHPF-Co(II)Cl 2 ] (C 1 ) and poly-([DHPF-Ni(II)Cl 2 ] (C 2 ) were isolated as blue and green solids, respectively. Complex C 2 was found to be a more effective precatalyst than C 1 in the presence of a cocatalyst. Thus, C 2 exhibited the maximum activity of 1.92 × 10 6 g mol −1 (Ni) h −1 bar −1 with an Al/Ni ratio of 3000:1 at room temperature, whereas C 1 exhibited a maximum activity of 1.87 × 10 6 g mol −1 (Co) h −1 bar −1 with a 5-atm pressure of ethylene. Upon increasing the Al/Co ratio at 1 atm pressure of ethylene, the catalytic activity of precatalyst increased and the process became more selective for higher oligomers. The catalytic activity and selectivity with 1-decene using C 1 were 3.16 × 10 5 g mol −1 (Co) h −1 bar −1 and 72%, respectively, with 5 atm ethylene and an Al/Co ratio of 300:1. C

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Schiff base‐functionalized boehmite nanoparticle‐supported molybdenum and vanadium complexes: efficient catalysts for the epoxidation of alkenes

Mirzaee

Bahramian

Amoli

2015

Applied Organom Chemis

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Boehmite nanoparticles, with high surface area and high degree of surface hydroxyl groups, were prepared via hydrothermal-assisted sol-gel processing of aluminium 2-butoxide. The produced powder was covalently functionalized with 3-(trimethoxysilyl)propylamine, and then, in order to support vanadium oxosulfate and molybdenum hexacarbonyl complexes, all the terminal amine groups were changed to Schiff bases by refluxing with salicylaldehyde. These catalysts were applied in the epoxidation of cis-cyclooctene and other olefins with tert-BuOOH in CCl 4 . The catalytic procedures for both catalysts were optimized for various parameters such as solvent and oxidant. Recycling experiments revealed that these heterogeneous nano-catalysts could be repeatedly applied for the epoxidation of alkenes.

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Olefin epoxidation catalyzed by Schiff base molybdenum (VI) complexes immobilized onto zirconium poly (styrene-phenylvinylphosphonate)-phosphate

Cited by 28 publications

References 21 publications

Catalysis of Organic Processes by Metal Phenolates

Catalysis of Organic Processes by Metal Phenolates

Synthesis and Characterization of Polymer Metal Complexes and Their Catalytic Activity in Ethylene Oligomerization

Schiff base‐functionalized boehmite nanoparticle‐supported molybdenum and vanadium complexes: efficient catalysts for the epoxidation of alkenes

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