Browsing Department of Chemistry by Title

Now showing items 96-115 of 357

Davis-Beirut Reaction: A Photochemical Brønsted Acid Catalyzed Route to N-Aryl 2 H-Indazoles

Kraemer, Niklas; Li, Clarabella J.; Zhu, Jie S.; Larach, Julio M.; Tsui, Kayi; Tantillo, Dean Joseph; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2019)

The Davis-Beirut reaction provides access to 2H-indazoles from aromatic nitro compounds. However, N-aryl targets have been traditionally challenging to access due to competitive alternate reaction pathways. Previously, the ...
Davis-Beirut Reaction: Alkoxide versus Hydroxide Addition to the Key o-Nitrosoimine Intermediate

Zhu, Jie S.; Duong, Matthew R.; Teuthorn, Andrew P.; Lu, Julia Y.; Son, Jung-Ho; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2018)

Reaction options, alkoxide vs hydroxide vs amine addition to the key intermediate (o-nitrosoimine) generated in the Davis-Beirut reaction of an o-nitrobenzylamine substrate, are reported to explain the nucleophilic addition ...
Davis-Beirut Reaction: Diverse Chemistries of Highly Reactive Nitroso Intermediates in Heterocycle Synthesis

Zhu, Jie S.; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2019)

ConspectusIndazoles are an important class of nitrogen heterocycles because of their excellent performance in biologically relevant applications, such as in chemical biology and medicinal chemistry. In these applications, ...
Davis-Beirut reaction: Route to thiazolo-, thiazino-, and thiazepino-2 h -indazoles

Farber, Kelli M.; Haddadin, Makhluf J.; Kurth, Mark J. (American Chemical Society, 2014)

Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1°-aminothioalkanes are reported. The process consists of formation ...
Davis–Beirut reaction inspired nitroso Diels–Alder reaction

Son, Jung-Ho; Cheung, Amy; Zhu, Jie S.; Haddadin, Makhluf J.; Kurth, Mark J. (Elsevier Ltd, 2021)

A Davis–Beirut reaction inspired nitroso Diels–Alder protocol is reported. The starting material for the procedure is a nitrophenyl moiety with the para position appropriately substituted with a 2°-amine (see 5) or 2°-alcohol ...
Day-Night Transport-induced Chemistry and Clouds on WASP-39b: Gas-phase Composition

Ghazali, Sarah; Baalbaki, Abbas; Bou Karroum, Weam; Bejjani, Alice; Ghauch, Antoine (Royal Society of Chemistry, 2023)

MIL-88-A, an iron-based metal-organic framework (MOF), was synthesized and investigated for its potential as a mediator in a solar-powered system for the activation of persulfate (PS). Solar/MIL-88-A/PS and UVA/MIL-88-A/PS ...
Defect Control in Zr-Based Metal-Organic Framework Nanoparticles for Arsenic Removal from Water

Assaad, Nisrine; Sabeh, Ghewa; Hmadeh, Mohamad (American Chemical Society, 2020)

In this study, water-stable Zr-metal-organic framework (MOF) (UiO-66) nanoparticles of various defect concentrations were successfully prepared and examined as the adsorbent for arsenate removal from water. The induced ...
Degradation of theophylline in a UV254/PS system: Matrix effect and application to a factory effluent

Al Hakim, Suha; Jaber, Saly; Zein Eddine, Nagham; Baalbaki, Abbas; Ghauch, Antoine (Elsevier B.V., 2020)

Oxidative degradation of emerging waterborne contaminants, particularly pharmaceuticals, is currently an extensively studied field of research. In this study, a UV-254 nm activated persulfate (PS) system (UV254/PS) was ...
Degradation of VOCs and NOx over Mg(Cu)-AlFe mixed oxides derived from hydrotalcite-like compounds

Mrad, Raya; Cousin, Renaud; Saliba, Najat A.; Tidahy, Haingomalala Lucette; Siffert, Stéphane (Elsevier Masson SAS, 2015)

A series of Mg(Cu)-AlFe mixed oxides derived from hydrotalcite-like compounds has been prepared. These solids were characterized by various physicochemical methods and their catalytic performances were tested towards the ...
Design and control of MOFs-based indoor humidity pump integrated into the building's ventilated façade in hot and humid climates

Harrouz, Jean Paul; Ghali, Kamel Abou; Hmadeh, Mohamad; Slim, Rayan; Katramiz, Elvire; Ghaddar, Nesreen K. (Elsevier Ltd, 2022)

Indoor humidity management is vital for both building and occupant health. Conventional methods that decouple the latent and sensible load use desiccant dehumidifiers integrated with vapor compression systems to supply ...
Detection of 5-hydroxymethylfurfural and furfural in the aerosol of electronic cigarettes

Soussy, Sarah; El-Hellani, Ahmad; Baalbaki, Rima; Salman, Rola; Shihadeh, Alan Louis; Saliba, Najat A. (BMJ Publishing Group, 2016)

Significance The wide availability of sweet flavours has been hypothesised as a factor in the popularity of electronic cigarette (ECIG), especially among youth. Saccharides, which are commonly used to impart a sweet flavour ...
Development of Kras mutant lung adenocarcinoma in mice with knockout of the airway lineage-specific gene Gprc5a

Fujimoto, Jyunya; Nunomura-Nakamura, Sayuri; Liu, Yihua; Lang, Wenhua; McDowell, Tina L.; Jakubek, Yasminka A.; Ezzeddine, Dalia; Kapere Ochieng, Joshua; Petersen, Jason L.; Davies, Gareth E.; Fukuoka, Junya; Wistuba, Ignacio Ivans; Ehli, Erik A.; Fowler, Jerry; Scheet, Paul A.; Kadara, Humam N. (Wiley-Liss Inc., 2017)

Despite the urgency for prevention and treatment of lung adenocarcinoma (LUAD), we still do not know drivers in pathogenesis of the disease. Earlier work revealed that mice with knockout of the G-protein coupled receptor ...
Dibenzonaphthyridinones: Heterocycle-to-Heterocycle Synthetic Strategies and Photophysical Studies

Palazzo, Teresa Ann; Patra, Digambara; Yang, Joung S.; El Khoury, Elsy D.; Appleton, Mackenzie G.; Haddadin, Makhluf J.; Tantillo, Dean Joseph; Kurth, Mark J. (American Chemical Society, 2015)

A heterocycle-to-heterocycle strategy is presented for the preparation of highly fluorescent and solvatochromic dibenzonaphthyridinones (DBNs) via methodology that leads to the formation of a tertiary, spiro-fused carbon ...
Did JUUL alter the content of menthol pods in response to US FDA flavour enforcement policy?

Yassine, Amira; El-Hage, Rachel; El-Hellani, Ahmad; Salman, Rola; Talih, Soha; Eissenberg, Thomas E.; Shihadeh, Alan Louis; Saliba, Najat A. (BMJ Publishing Group, 2022)

Background The JUUL electronic cigarette (e-cigarette) remains popular in the USA and has a big prevalence among youth. In response to the popularity of JUUL and similar devices among youth, the US Food and Drug Administration ...
Dimerization of Aldehydes into Esters by an Octahedral d6-Rhodium cis-Dihydride Catalyst: Inner-versus Outer-Sphere Mechanisms

Mallah, Josephina; Ataya, Mohamad; Hasanayn, Faraj (American Chemical Society, 2020)

The tripodal ligated octahedral complex d6-[Rh(PhB(CH2PPh2)3)(H)2(NCMe)] (1-RhH) was discovered by Tejel and co-workers to catalyze the Tishchenko reaction in which two aldehydes are dimerized into an ester. Two fundamentally ...
Dinitrogen Reduction to Ammonium at Rhenium Utilizing Light and Proton-Coupled Electron Transfer

Bruch, Quinton J.; Connor, Gannon P.; Chen, Chunhsing; Holland, Patrick L.; Mayer, James M.; Hasanayn, Faraj; Miller, Alexander J.M. (American Chemical Society, 2019)

The direct scission of the triple bond of dinitrogen (N2) by a metal complex is an alluring entry point into the transformation of N2 to ammonia (NH3) in molecular catalysis. Reported herein is a pincer-ligated rhenium ...
Dithieno[3,2-a:2′,3′-c]phenazine-based chemical probe for anions: A spectroscopic study of binding

El-Assaad, Tarek H.; Shiring, Stephen B.; Getmanenko, Yulia A.; Hallal, Kassem M.; Brédas, J. L. Luc; Marder, Seth R.; Al-Sayah, Mohammad Hussein; Kaafarani, Bilal R. (Royal Society of Chemistry, 2015)

The synthesis of a new anion-responsive molecule N,N′-(2,5-bis(4-(tert-butyl)phenyl)dithieno[3,2-a:2′,3′-c]phenazine-9,10-diyl)bis(4-methylbenzenesulfonamide) (1) is reported. The sensitivities of the spectroscopic properties ...
Diverting Reactive Intermediates Toward Unusual Chemistry: Unexpected Anthranil Products from Davis-Beirut Reaction

Zhu, Jie S.; Son, Jung-Ho; Teuthorn, Andrew P.; Haddadin, Makhluf J.; Kurth, Mark J.; Tantillo, Dean Joseph (American Chemical Society, 2017)

The discovery of a new variation on the Davis-Beirut reaction is described in which an atypical heterocyclic framework (the anthranil or benzo[c]isoxazole framework) is formed as the result of diversion of a key reactive ...
Does the Bubbler Scrub Key Toxicants from Waterpipe Tobacco Smoke?: Measurements and Modeling of CO, NO, PAH, Nicotine, and Particulate Matter Uptake

el-Hourani, Mario G.; Salman, Rola; Talih, Soha; Saliba, Najat A.; Shihadeh, Alan Louis (American Chemical Society, 2020)

Waterpipe tobacco smoking is a global epidemic. A persistent perception among users is that the water bubbler filters the smoke, reducing its risk profile. The objectives of this study were to quantify the purported filtering ...
Dust episodes in Beirut and their effect on the chemical composition of coarse and fine particulate matter

Jaafar, Malek; Baalbaki, Rima; Mrad, Raya; Daher, Nancy; Shihadeh, Alan Louis; Sioutas, Constantinos; Saliba, Najat A. (Elsevier, 2014)

Particles captured during dust episodes in Beirut originated from both the African and Arabian deserts. This particular air mixture showed an increase, over non-dust episodes, in particle volume distribution which was ...

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