Environmental Chemistry

Hanif, Muhammad Asif; Nadeem, Farwa; Bhatti, Ijaz Ahmad; Tauqeer, Hafiz Muhammad

doi:10.1002/9781119651055

Cited by 5 publications

(8 citation statements)

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“…This method is quite useful and can be applied to three-component couplings, but ortho-functionalization frequently requires substituents at the other ortho-position to prevent difunctionalization, and it requires haloarenes as the starting material, causing a negative environmental impact. 4 The use of a traceless directing group in transition-metal-catalyzed coupling is another viable strategy for ortho-functionalization. Pioneered by Daugulis and Miura, carboxylates can be used as a directing group under palladium catalysis for regioselective arene functionalization, and then can be removed (Figure 1B).…”

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confidence: 99%

“…Subsequent coupling with electrophiles and decarbopalladation with concomitant expulsion of NBE affords ortho -functionalized arenes. This method is quite useful and can be applied to three-component couplings, but ortho -functionalization frequently requires substituents at the other ortho -position to prevent difunctionalization, and it requires haloarenes as the starting material, causing a negative environmental impact . The use of a traceless directing group in transition-metal-catalyzed coupling is another viable strategy for ortho -functionalization.…”

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confidence: 99%

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Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Coupling Reactions

et al. 2022

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“Dance reaction” on the aromatic ring is a powerful method in organic chemistry to translocate functional groups on arene scaffolds. Notably, dance reactions of halides and pseudohalides offer a unique platform for the divergent synthesis of substituted (hetero)aromatic compounds when combined with transition-metal-catalyzed coupling reactions. Herein, we report a tandem reaction of ester dance and decarbonylative coupling enabled by palladium catalysis. In this reaction, 1,2-translocation of the ester moiety on the aromatic ring is followed by decarbonylative coupling with nucleophiles to enable the installation of a variety of nucleophiles at the position adjacent to the ester in the starting material.

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confidence: 99%

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confidence: 99%

Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Coupling Reactions

et al. 2022

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“…This method is quite useful and can be applied to three-component couplings, but ortho-functionalization frequently requires substituents at the other ortho-position to prevent difunctionalization, and requires haloarenes as the starting material, causing a negative environmental impact. 4 The use of a traceless directing group in transition-metal-catalyzed coupling is another viable strategy for ortho-functionalization. Pioneered by Dougulis and Miura, carboxylates can be used as a directing group under palladium catalysis for regioselective arene functionalization, and then be removed (Figure 1B).…”

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confidence: 99%

Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Cou-pling Reactions

Kubo

Inayama

Ota

et al. 2022

Preprint

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“Dance reaction” on the aromatic ring is a powerful method in organic chemistry to translocate functional groups on arene scaffolds. Notably, dance reactions of halides and pseudo-halides offer a unique platform for the divergent synthesis of substituted (het-ero)aromatic compounds when combined with transition-metal-catalyzed coupling reactions. Herein, we report a tandem reaction of ester dance and decarbonylative coupling enabled by palladium catalysis. In this reaction, 1,2-translocation of the ester moiety on the aromatic ring is followed by decarbonylative coupling with nucleophiles to enable the installation of a variety of nucleophiles at the posi-tion adjacent to the ester in the starting material. The key to this reaction is to use dcypt, an electron-rich, bulky diphosphine ligand. Vari-ous decarbonylative couplings such as C–H arylation, amination, intramolecular etherification, and intermolecular arylation are success-fully executed following the ester dance.

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“…Photochemical pollutants such as SO 2 , NO x , peroxyacetyl nitrate (CH 3 COONO 3 , or PAN), and ozone are major components of fine particulate matter (PM2.5) and are recognized as environmental hazards to human health, especially chronic damage to respiratory function. 1 WHO has reported in their Global Air Quality Guidelines 2 that long-term exposure to NO 2 or O 3 , even at moderate levels (10−20 ppb, well below 5000 or 100 ppb of the OSHA permissible exposure limit for NO 2 or O 3 , respectively), can result in health risks such as chest distress, asthma, or headaches. 3,4 For a realistic evaluation of ambient air quality, both outdoor and local indoor measurements of airborne pollutants are necessary.…”

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confidence: 99%

“…Developing miniaturized and cost-effective chemical sensors remains an essential worldwide task for field-deployable detection of airborne pollutants in localized environments. Photochemical pollutants such as SO 2 , NO x , peroxyacetyl nitrate (CH 3 COONO 3 , or PAN), and ozone are major components of fine particulate matter (PM2.5) and are recognized as environmental hazards to human health, especially chronic damage to respiratory function . WHO has reported in their Global Air Quality Guidelines that long-term exposure to NO 2 or O 3 , even at moderate levels (10–20 ppb, well below 5000 or 100 ppb of the OSHA permissible exposure limit for NO 2 or O 3 , respectively), can result in health risks such as chest distress, asthma, or headaches. , …”

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confidence: 99%

Multiplexed Analysis of Photochemical Oxidants Using a Nanoparticle-Based Optoelectronic Nose

Zhang

Lü

et al. 2021

Anal. Chem.

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Photochemical pollutants pose a substantial threat to human health in both outdoor and indoor environments. Herein, we prepare a class of gold nanoparticle-based colorimetric sensor arrays on optimized hydrophobic substrates using a simple pin-printing method for accurate identification and quantification of various gas-phase oxidants, as these microdetectors are low cost, sensitive, and easy to fabricate. For an array of AuNP sensors modified with various thiol-terminated ligands, a unique and distinguishable change in color (i.e., red, green, and blue response patterns) was obtained for each specific pollutant for molecular fingerprinting. Remarkable discrimination among 15 gases at a fairly low vapor concentration (i.e., 500 ppb) was illustrated using standard chemometric methods. Using digital imaging, the AuNP colorimetric sensor array offers ultrasensitive dosimetric identification of gas-phase oxidants relevant to outdoor and indoor air pollution, with limits of detection generally at sub-ppb levels for 2 h measurement. As a practical application, the sensor array is able to predict the overall air quality in indoor office environments over 24 h. Such sensor array based on chemically induced sintering of nanoparticles has significant implications for the development of nanosensors used in continuous monitoring of potential airborne pollutants at low concentrations from a large number of locations in a cost-effective manner.

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Environmental Chemistry

Cited by 5 publications

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Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Coupling Reactions

Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Coupling Reactions

Palladium-Catalyzed Tandem Ester Dance/Decarbonylative Cou-pling Reactions

Multiplexed Analysis of Photochemical Oxidants Using a Nanoparticle-Based Optoelectronic Nose

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