Transfer hydrogenation of olefins catalysed by nickel nanoparticles

Alonso, Francisco; Riente, Paola; Yus, Miguel

doi:10.1016/j.tet.2009.10.057

Cited by 67 publications

(49 citation statements)

References 42 publications

(9 reference statements)

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“…Olefins and hydroxyl-like compounds are relatively reactive (compared to their saturated and carboxylic counterparts) and can be thermally oxidized or by allylic substitution lead to the formation of larger macromolecules (33). The latter pathway may be further catalyzed by the presence of highly reactive nanomaterials present in the toner powder (34). A study evaluating the emissions from photocopiers identified nalkanes ( e.g ., tetracosane, tetracontane, octatriacontane, hexatriacontane) in both the toner (10 to 2670 ppm) and in all sampled airborne fractions (2 to 10 ng/m 3 ) (1).…”

Section: Resultsmentioning

confidence: 99%

Synergistic effects of engineered nanoparticles and organics released from laser printers using nano-enabled toners: potential health implications from exposures to the emitted organic aerosol

Chalbot

Pirela

Schifman

et al. 2017

Environ. Sci.: Nano

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Recent studies have shown that engineered nanoparticles (ENPs) are incorporated into toner powder used in printing equipment and released during their use. Thus, understanding the functional and structural composition and potential synergistic effects of this complex aerosol and released gaseous co-pollutants is critical in assessing their potential toxicological implications and risks. In this study, toner powder and PEPs were thoroughly examined for functional and molecular composition of the organic fraction and the concentration profile of 16 Environmental Protection Agency (EPA)-priority polycyclic aromatic hydrocarbons (PAH) using state of the art analytical methods. Results show significant differences in abundance of non-exchangeable organic hydrogen of toner powder and PEPs, with a stronger aromatic spectral signature in PEPs. Changes in structural composition of PEPs are indicative of radical additions and free-radical polymerization favored by catalytic reactions, resulting in formation of functionalized organic species. Particularly, accumulation of aromatic carbons with strong styrene-like molecular signatures on PEPs is associated with formation of semivolatile heavier aromatic species (i.e., PAHs). Further, the transformation of low molecular weight PAHs in the toner powder to high molecular weight PAHs in PEPs was documented and quantified. This may be a result of synergistic effects from catalytic metal/metal oxide ENPs incorporated into the toner and the presence/release of semi-volatile organic species (SVOCs). The presence of known carcinogenic PAHs on PEPs raises public health concerns and warrants further toxicological assessment.

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Section: Resultsmentioning

confidence: 99%

Synergistic effects of engineered nanoparticles and organics released from laser printers using nano-enabled toners: potential health implications from exposures to the emitted organic aerosol

Chalbot

Pirela

Schifman

et al. 2017

Environ. Sci.: Nano

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“…Apart from that low catalyst loading, no use of additives, wide substrate scope, solvent free approach, easy product isolation and catalyst recycling up to 9 times are the major outcomes of this proposed protocol. reported procedure [25][26][27] Scheme 1 Synthesis of brittonin A …”

Section: Resultsmentioning

confidence: 99%

Ruthenium nanoparticle-intercalated montmorillonite clay for solvent-free alkene hydrogenation reaction

Upadhyay

Srivastava

2015

RSC Adv.

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Well characterized ruthenium nanoparticles intercalated montmorillonite clay was used as a catalyst for solvent free alkene hydrogenation reaction and the corresponding products were obtained in good yield. The catalytic activity of ruthenium nanoparticles intercalated montmorillonite clay was successfully tested for 16 different functionalized and non-functionalized alkenes. Apart from alkene reduction, the ruthenium nanoparticles intercalated montmorillonite clay was also applied for Wittig-type reaction for obtain dehydrobrittonin A, an important intermediate for the syntheses of brittonin A. Ruthenium nanoparticles intercalated montmorillonite clay was found active for the synthesis of dehydrobrittonin A and brittonin A. 9 times catalyst recycling, low catalyst loading, high catalytic activity and catalytic selectivity were the noteworthy outcomes of the proposed protocol.

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“…The reaction is very chemoselective: for instance allyl benzyl ether only suffers saturation of the carbon-carbon double bond without C-O bond cleavage (deallylation or debenzylation). 29 NiNPs generated by thermal decomposition of nickel diisopropoxide are also efficient for reduction of alkenes in isopropanol. 30 (47) Carbonyl Compounds.…”

Section: + Etohmentioning

confidence: 99%