- Micellar catalysis of the Suzuki Miyaura reaction using biogenic Pd nanoparticles fromDesulfovibrio alaskensis
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Microorganisms produce metal nanoparticles (MNPs) upon exposure to toxic metal ions. However, the catalytic activity of biosynthesised MNPs remains underexplored, despite the potential of these biological processes to be used for the sustainable recovery of critical metals, including palladium. Herein we report that biogenic palladium nanoparticles generated by the sulfate-reducing bacteriumDesulfovibrio alaskensisG20 catalyse the ligand-free Suzuki Miyaura reaction of abiotic substrates. The reaction is highly efficient (>99% yield, 0.5 mol% Pd), occurs under mild conditions (37 °C, aqueous media) and can be accelerated within biocompatible micelles at the cell membrane to yield products containing challenging biaryl bonds. This work highlights how native metabolic processes in anaerobic bacteria can be combined with green chemical technologies to produce highly efficient catalytic reactions for use in sustainable organic synthesis.
- Dennis, Jonathan A.,Era, Yuta,Horsfall, Louise E.,Wallace, Stephen
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supporting information
p. 8886 - 8890
(2021/11/23)
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- Preparation and characterization of side-chain liquid crystal polymer/paraffin composites as form-stable phase change materials
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A series of side-chain liquid crystal polymers (SCLCPs), named poly[ω-(4′-n-alkyloxybiphenyl-4-oxy) hexyl methacrylates] (P6biCm, m = 1, 2, 4, 6, 8, 10, 12, 14, 16 and 18), have been synthesized. Novel SCLCP/paraffin composite form-stable phase change materials (FSPCMs) were prepared by introducing P6biCm into paraffin. The minimum gelation concentration (MGC) and gel-to-sol transition temperature (TGS) properties were tested by a tube-testing method . It was found that P6biCm (m = 1, 2, 4, 6, 8, 10) were insoluble in paraffin, while P6biCm (m = 12, 14, 16, 18) exhibited a low MGC (≤6 wt%) and high TGS (TGS of P6biC12/paraffin is 140 °C). The structure and morphology of FSPCMs were systematically investigated by FT-IR, POM, 1D WXAD and SEM. The experimental results revealed that paraffin was restricted in the three-dimensional P6biCm network, leading to the FSPCM without leakage even above its melting point. The thermal properties were studied by DSC and TG. The research showed that the P6biCm/paraffin exhibited excellent thermal stability and high heat storage density. The shape stability was assessed by rheological measurements, indicating that solid hard gel soft gel liquid was observed with the increase of temperature. This work is useful in comprehending the physical mechanism of shape stability and in the meanwhile provides a novel method for synthesis of FSPCMs.
- Wu, Dang,Ni, Bin,Liu, Yujie,Chen, Sheng,Zhang, Hailiang
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p. 9645 - 9657
(2015/06/24)
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- An efficient, facile, and fast synthesis of 4-alkoxy-4′-hydroxybiphenyls
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A simple, fast and efficient method of synthesis of 4-alkoxy-4′-hydroxybiphenyls has been described. The reactions of 4,4′-dihydroxybiphenyl with appropriate alkyl halides were carried out over 3 h in DMSO in presence of solid powdered KOH.
- Orzeszko, Barbara,Melon-Ksyta, Dorota,Orzeszko, Andrzej
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p. 3425 - 3429
(2007/10/03)
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