Intercalated cobalt porphyrin between layered double hydroxide nanosheets as an efficient and recyclable catalyst for aerobic epoxidation of alkenes

Shen, Chengmin; Ma, Jie; Zhang, Tianlin; Zhang, Shusu; Zhang, Chenghao; Cheng, Han; Ge, Yuting; Liu, Lin; Tong, Zhiwei; Zhang, Bin

doi:10.1016/j.clay.2020.105478

Cited by 10 publications

(5 citation statements)

References 54 publications

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“…The allylic pathway is more favourable without the aldehyde in the Co( ii )-catalysed alkene oxidation reaction. 71,90,98…”

Section: Resultsmentioning

confidence: 99%

“…The allylic pathway is more favourable without the aldehyde in the Co(II)-catalysed alkene oxidation reaction. 71,90,98 The co-reactant IBA was transformed via an in situ dehydrogenation reaction into an acylperoxy radical (step II), which was the dominating oxidizing species and aided oxygen transfer to the substrate. Cyclohexene is an excellent substrate for determining whether the oxidizing species favours epoxidation or allylic oxidation.…”

Section: Mechanismmentioning

confidence: 99%

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A cobalt(ii) coordination polymer-derived catalyst engineered via temperature-induced semi-reversible single-crystal-to-single-crystal (SCSC) dehydration for efficient liquid-phase epoxidation of olefins

Hulushe,

Watkins,

Khanye

2024

Dalton Trans.

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“…The allylic pathway is more favourable without the aldehyde in the Co( ii )-catalysed alkene oxidation reaction. 71,90,98…”

Section: Resultsmentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 99%

A cobalt(ii) coordination polymer-derived catalyst engineered via temperature-induced semi-reversible single-crystal-to-single-crystal (SCSC) dehydration for efficient liquid-phase epoxidation of olefins

Hulushe,

Watkins,

Khanye

2024

Dalton Trans.

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“…Figure 1A represents the XRD patterns of the prepared Mg x Al-LDHs precursors with various Mg/Al ratios. It can be seen that the series of Mg x Al-LDHs had obvious characteristic peaks at 2θ of 11.20 • (003), 22.56 • (006), 34.28 • (009), and 60.22 • (110) and the peaks were relatively symmetrical and sharp, which showed that the pure-phase and good-quality precursors were successfully obtained by the co-precipitation method [30][31][32]. The position of the characteristic peak (003) showed that the interlayer of the M x Al-LDHs precursors was mainly NO 3 − and CO 3 2− .…”

Section: Introductionmentioning

confidence: 93%

Catalytic Synthesis of Methacrolein via the Condensation of Formaldehyde and Propionaldehyde with L-Proline Intercalated Layered Double Hydroxides

Ju¹,

Li²,

Luo³

2021

Catalysts

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Aldol condensation reactions are very important C–C coupling reactions in organic chemistry. In this study, the catalytic performance of layered double hydroxides (LDHs) in the aldol condensation reaction of formaldehyde (FA) and propionaldehyde (PA) was investigated. The MxAl-LDHs (denoted as re-MxAl–LDHs; M = Ca and Mg; X = 2–4), as heterogeneous basic catalysts toward the aldol condensation reaction, were prepared via a two-step procedure. The catalyst exhibited a high PA conversion (82.59%), but the methacrolein (MAL) selectivity was only 36.01% due to the limitation of the alkali-catalyzed mechanism. On this basis, the direct intercalation of L-proline into LDHs also has been investigated. The influences of several operating conditions, including the temperature, reaction time, and substrate content, on the reaction results were systematically studied, and the optimized reaction conditions were obtained. The optimized Mg3Al–Pro-LDHs catalyst exhibited a much higher MAL selectivity than those of re-MgxAl–LDHs.

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“…The first is proposed by Shen and Sun et al, as shown in Scheme 5 (a). [86,87] First Co reacts with an aldehyde to form an acyl radical, then the acyl radical reacts with oxygen to form an acyl peroxy radical. Acyl peroxy radicals are thought to perform two roles.…”

Section: Co-based Catalysts 61 Mechanism Of Epoxidationmentioning

confidence: 99%

An Overview of Heterogeneous Transition Metal‐Based Catalysts for Cyclohexene Epoxidation Reaction

Dong,

Shao,

et al. 2023

Eur J Inorg Chem

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Cyclohexane epoxide with highly active epoxy groups is an important intermediate in the preparation of fine chemicals. However, the epoxidation path of cyclohexene is difficult to be controlled due to the allyl oxidation of cyclohexene and the ring opening of cyclohexane epoxide in the process of cyclohexene epoxidation to cyclohexane oxide. This work mainly reviewed the structure‐activity relationships and synthesis processes of a series of heterogeneous transition metal‐based catalysts based on cyclohexene epoxidation reaction, including molybdenum(Mo)‐based, tungsten(W)‐based, vanadium(V)‐based, titanium(Ti)‐based, cobalt(Co)‐based,, etc. catalysts. First, the mechanism of cyclohexene epoxidation by transition metal‐based catalysts was collated from the perspective of catalytic active centers. Then, the current status of research on cyclohexene epoxidation catalysts was summarized from the perspective of catalyst support. At the same time, the differences between alkyl hydroperoxide, hydrogen peroxide (H2O2), and oxygen (O2) as oxidants were analyzed. Finally, the main factors affecting the catalytic performance were summarized and the reasonable opinions on the design of catalysts were put forward. The above work provided some scientific support for the development of olefin epoxidation industry.

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Intercalated cobalt porphyrin between layered double hydroxide nanosheets as an efficient and recyclable catalyst for aerobic epoxidation of alkenes

Cited by 10 publications

References 54 publications

A cobalt(ii) coordination polymer-derived catalyst engineered via temperature-induced semi-reversible single-crystal-to-single-crystal (SCSC) dehydration for efficient liquid-phase epoxidation of olefins

A cobalt(ii) coordination polymer-derived catalyst engineered via temperature-induced semi-reversible single-crystal-to-single-crystal (SCSC) dehydration for efficient liquid-phase epoxidation of olefins

Catalytic Synthesis of Methacrolein via the Condensation of Formaldehyde and Propionaldehyde with L-Proline Intercalated Layered Double Hydroxides

An Overview of Heterogeneous Transition Metal‐Based Catalysts for Cyclohexene Epoxidation Reaction

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