Results 31 to 40 of about 5,533 (176)

Light‐Induced Reactions of Small‐Membered Cyclic Carbonyl Compounds

European Journal of Organic Chemistry, EarlyView.
This review highlights recent advances in the synthesis and photochemical reactivity of cyclopropenone and cyclobutenedione. These compounds undergo photolysis upon direct excitation, and in some cases, through indirect excitation by photocatalysts. The resulting photogenerated species exhibit unique reactivity profiles that are strongly influenced by ...
Kenji Mishiro
wiley   +1 more source

Illicit Drug‐Derived Volatile Organic Compounds as Markers for Application in Noncontact Detection Technology

The Chemical Record, EarlyView.
This review highlights the characteristic odor markers of illicit drugs, emphasizing volatile markers from both natural and synthetic sources, and explores the shift from canine‐based detection to emerging noncontact sensing technologies. Illicit drug use remains a global concern, requiring effective detection methods to counter evolving concealment ...
Minwoo Kim, Solpa Lee, Anmo J. Kim, Cong Wang, Yongwoo Jang   +4 more
wiley   +1 more source

Biphenyl-Derived Phosphepines as Chiral Nucleophilic Catalysts: Enantioselective [4+1] Annulations To Form Functionalized Cyclopentenes [PDF]

, 2014
Because of the frequent occurrence of cyclopentane subunits in bioactive compounds, the development of efficient catalytic asymmetric methods for their synthesis is an important objective.
Fu, Gregory C., Fujiwara, Yuji, Ikeda, Takuya, Riesgo, Lorena, Ziegler, Daniel T.   +4 more
core   +2 more sources

A Radical Cascade with Double Intramolecular Hydrogen Atom Transfer for the Generation of Bisfunctionalized Cyclopentanes from Linear Alkynes

Angewandte Chemie, Volume 138, Issue 5, 28 January 2026.
A radical cascade process involving the activation of two aliphatic C–H bonds in a series of five elementary steps converts readily available terminal alkynes into functionalized cyclopentylmethyl arylsulfones. The methodology delivers flexible synthetic intermediates and was applied to the preparation of diquinanes and triquinanes possessing a rare ...
Lise Benoist, Éléonore Barbier, Mariam Sangare, Philippe Renaud, Fabrice Dénès   +4 more
wiley   +2 more sources

Electronic Smoking Devices Among University Students: Usage Patterns and Chemical Composition of Inhaled Substances

Analytical Science Advances, Volume 7, Issue 1, June 2026.
ABSTRACT This study investigated the prevalence of electronic smoking device (ESD) use and its associated behavioural and chemical risks among university students in Bahia, Brazil. A cross‐sectional survey was conducted with 355 students from public and private institutions through an online questionnaire between April and May 2023. Among participants,
Eduard F. Valenzuela, Raffael Silva Santos Almeida, Ivana Ferreira Simões, Aline Gonçalves Miranda, Magno Oliveira Ramos, Roberto Rodrigues Bandeira Tosta Maciel, Fernanda Warken Rosa, Aníbal de Freitas Santos Júnior   +7 more
wiley   +1 more source

Clumped Isotope Temperature Reconstruction Using Stalagmite Drip Cups

Rapid Communications in Mass Spectrometry, Volume 40, Issue 8, 30 April 2026.
ABSTRACT Rationale Application of clumped isotope palaeothermometry to speleothems (carbonate cave deposits, e.g., stalagmites and flowstones) has been restricted largely to subaqueous samples because of kinetic fractionation processes that occur during subaerial speleothem formation, which lead to erroneously high inferred temperatures.
Stuart Umbo, Maria Box, Aviva Intveld, Jack Longman, Sevasti Modestou, Stacy A. Carolin, Daniel H. James, Alfredo Martínez‐García, Carlos Peraza Lope, Mark Brenner, David Hodell, Sebastian F. M. Breitenbach   +11 more
wiley   +1 more source

Binap-silver-catalyzed enantioselective multicomponent 1,3-dipolar cycloaddition of azomethines ylides derived from ethyl glyoxylate [PDF]

, 2015
The enantioselective binap–silver catalyzed multicomponent 1,3-dipolar cycloaddition using ethyl glyoxylate, phenylalanine ethyl ester, and maleimides is described. The employment of basic silver carbonate allows the reaction to take place in the absence
Mancebo Aracil, Juan, Nájera, Carmen, Sansano, Jose M.   +2 more
core   +2 more sources

Modification of POSS and their tribological properties and resistant to space atomic oxygen irradiation as lubricant additive of multialkylated cyclopentanes

Friction
Developing functional additive resistant to space atomic oxygen (AO) irradiation through simple molecular design and chemical synthesis to enhance the lubricating performance of multialkylated cyclopentanes (MACs) oil is a significant challenge.
Xingwei Wang, Chaoyang Zhang, Chen Zhao, Yijing Liang, Ming Zhang, Wufang Yang, Bo Yu, Qiangliang Yu, Meirong Cai, Feng Zhou, Weimin Liu   +10 more
doaj   +1 more source

Enantioselective stereodivergent nucleophile-dependent isothiourea-catalysed domino reactions [PDF]

, 2016
We thank the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013) ERC grant agreement no. 279850 (J.E.T.) and the EPSRC (EP/J018139/1, A.M.).
Abbasov, Abbasov, Bappert, Beno, Birman, Biswas, Borie, Enders, Fukata, Fukata, Goudedranche, Grondal, Hao, Liu, Liu, Liu, Marcelli, Morrill, Pellissier, Robinson, Taylor, Tietze, Vellalath, Vellalath, Vilums, Volla, West, Wurz   +27 more
core   +2 more sources

Liquid Space Lubricants Examined by Vibrational Micro-Spectroscopy [PDF]

, 2008
Considerable effort has been expended to develop liquid lubricants for satellites and space exploration vehicles. These lubricants must often perform under a range of harsh conditions such as vacuum, radiation, and temperature extremes while in orbit or ...
Street, Kenneth W., Jr.
core   +2 more sources