Influence of acid–base properties of mixed oxides derived from hydrotalcite-like precursors in the transfer hydrogenation of propiophenone

Jyothi, T. M.; Raja, Thirumalaiswamy; Sreekumar, K.; Talawar, M. B.; Rao, B.S.

doi:10.1016/s1381-1169(99)00439-2

Cited by 49 publications

(16 citation statements)

References 18 publications

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“…Similar observation was also reported by Romero et al [34]. The source of acidity in hydrotalcite and derived mixed oxide is aluminum ions, which generate strong Lewis acidity [37].…”

Section: Physico-chemical Properties Of Supported Copper Samplessupporting

confidence: 88%

Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Dixit

Mishra

Joshi

et al. 2013

Journal of Industrial and Engineering Chemistry

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“…Similar observation was also reported by Romero et al [34]. The source of acidity in hydrotalcite and derived mixed oxide is aluminum ions, which generate strong Lewis acidity [37].…”

Section: Physico-chemical Properties Of Supported Copper Samplessupporting

confidence: 88%

Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Dixit

Mishra

Joshi

et al. 2013

Journal of Industrial and Engineering Chemistry

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“…At high reaction temperatures (225-275°C), reduction is followed by a dehydration, giving β-methylstyrene as the main product. 194 It is found that basic sites favor the initial hydrogenation to the alcohol, whereas the selectivity of β-methylstyrene is improved by the substitution of Mg 2+ by Ni 2+ or Cu 2+ as a result of the formation of stronger acid sites. Consequently, with a calcined MgAl-CO 3 2− hydrotalcite, 1-phenyl-1-propanol is the main product (69% selectivity), whereas with a CuAl-CO 3 2− -derived mixed oxide, β-methylstyrene predominates.…”

Section: Hydrogen-transfer Processesmentioning

confidence: 98%

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

et al. 2017

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Layered double hydroxides (LDHs) and derived materials have been widely used as heterogeneous catalysts for different types of reactions either in gas or in liquid phase. Among these processes, the valorization/upgrading of lignocellulosic biomass and derived molecules have attracted enormous attention because it constitutes a pivotal axis in the transition from an economic model based on fossil resources to one based on renewable biomass resources with preference for biomass waste streams. Proof of this is the increasing amount of literature reports regarding the rational design and implementation of LDHs and related materials in catalytic processes such as: depolymerization, hydrogenation, selective oxidations, and C-C coupling reactions, among others, where biomass-derived compounds are used. The major aim of this contribution is to situate the most recent advances on the implementation of these types of catalysts into a lignocellulosic-feedstock biorefinery scheme, highlighting the versatility of LDHs and derived materials as multifunctional, tunable, cheap and easy to produce heterogeneous catalysts.

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“…This reaction has now been extended to the hydrogenation of benzaldehyde, [6] citral, [7,8] aryl alkyl ketones, [9] and propiophenone. [10] The reduction of carbonyl compounds based on thiophene permits one to synthesise the corresponding thiophenemethanols which are intermediates for the synthesis of some herbicides [11] and pharmaceutical compounds. [12,13] This prompted us to investigate an extension of the base-catalysed hydrogen transfer to substrates containing sulphur moieties.…”

Section: Introductionmentioning

confidence: 99%

Base‐Catalysed Hydrogenation of Sulphur‐Containing Aldehydes

Kumbhar²,

Figuéras

2003

Adv Synth Catal

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The present work reports the first selective catalytic hydrogenation of bifunctional compounds containing a carbonyl and sulphur moieties, using hydrogen transfer from alcohols and a basic catalyst. The reaction was performed in batch at 371 K at atmospheric pressure with 3-mercaptopropionaldehyde, thiophene-2-carboxaldehyde, 5-bromothiophene-2-carboxaldehyde and 4-methylthiobenzaldehyde. The only product of reaction was the alcohol, formed with yields > 80%, except with 3-mercaptopropionaldehyde which did not give the alcohol but rather afforded unidentified heavy products. 5-Bromothiophenemethanol was obtained with 100% yield in 3 h. The reaction obeys a mechanism of competitive adsorption of the reactants, and the reaction rates are higher than those reported for supported rhodium catalysts.

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Influence of acid–base properties of mixed oxides derived from hydrotalcite-like precursors in the transfer hydrogenation of propiophenone

Cited by 49 publications

References 18 publications

Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

Base‐Catalysed Hydrogenation of Sulphur‐Containing Aldehydes

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