Results 31 to 40 of about 5,810 (254)

A Simple and Effective Protocol for the Pechmann Reaction to Obtain 4-Methylcoumarin Derivatives Using a High-Speed Mixer Ball Mill Process

Chemistry, 2023
We hereby report a simple and efficient method for the preparation of 4-methylcoumarins series, including Coumarin 120 (7-amino-4-methylcoumarin) from phenols (or naphthols) and ethyl acetoacetate in the presence of 3 mol% InCl3.
Silvia J. Becerra-Anaya, Diego R. Merchán Arenas, Vladimir V. Kouznetsov   +2 more
doaj   +1 more source

Urinary naphthalene and phenanthrene as biomarkers of occupational exposure to polycyclic aromatic hydrocarbons. [PDF]

, 2008
OBJECTIVES: The study investigated the utility of unmetabolised naphthalene (Nap) and phenanthrene (Phe) in urine as surrogates for exposures to mixtures of polycyclic aromatic hydrocarbons (PAHs).
Garshick, E, Hart, J. E., Herrick, R. F., Laden, F., McClean, M. D., Rappaport, S. M., Smith, T. J., Sobus, J. R., Waidyanatha, S., Zheng, Y.   +9 more
core   +3 more sources

Transition-Metal-Free [3+2] Dehydration Cycloaddition of Donor-Acceptor Cyclopropanes With 2-Naphthols

Frontiers in Chemistry, 2021
A Brønsted acid-catalyzed domino ring-opening cyclization transformation of donor-acceptor (D-A) cyclopropanes and 2-naphthols has been developed.
Hua Zhao, Peng Shen, Dongru Sun, Hongbin Zhai, Yufen Zhao   +4 more
doaj   +1 more source

Asymmetric synthesis of gonytolide A: strategic use of an aryl halide blocking group for oxidative coupling [PDF]

, 2018
The first synthesis of the chromanone lactone dimer gonytolide A has been achieved employing vanadium(V)-mediated oxidative coupling of the monomer gonytolide C. An o-bromine blocking group strategy was employed to favor para- para coupling and to enable
Iwata, Takayuki, Porco, John A., Qin, Tian, Reichl, Kyle D., Scharf, Adam, Wu, Xiaowei   +5 more
core   +1 more source

Total Syntheses of HMP-Y1, Hibarimicinone, and HMP-P1 [PDF]

, 2012
Total syntheses of HMP-Y1, atrop-HMP-Y1, hibarimicinone, atrop-hibarimicinone, and HMP-P1 are described using a two-directional synthesis strategy. A novel benzyl fluoride Michael–Claisen reaction sequence was developed to construct the complete carbon ...
Liau, Brian Bor-Jen, Milgram, Benjamin Charles, Shair, Matthew David   +2 more
core   +1 more source

Three-component domino reaction in Triton B: A facile synthesis of 4H-chromene derivatives

Results in Chemistry, 2023
Herein, we report an unprecedented one-pot domino synthesis of indole- or naphthol-tethered biologically relevant 4H-chromene derivatives from readily accessible salicylaldehydes, malononitrile, and indoles/β-naphthols employing efficient, inexpensive ...
Mrinal Talukdar, Nasreen Islam, Eeshwaraiah Begari   +2 more
doaj   +1 more source

Iridium-Catalyzed, Silyl-Directed, peri -Borylation of C−H Bonds in Fused Polycyclic Arenes and Heteroarenes [PDF]

, 2018
peri-Disubstituted naphthalenes exhibit interesting physical properties and unique chemical reactivity, due to the parallel arrangement of the bonds to the two peri-disposed substituents.
Hartwig, John F, Su, Bo
core   +1 more source

Characterization of an Injectable Poly(vinyl alcohol)‐gelatin Hydrogel for Growth Factor Delivery in an Orthopedic Application

Advanced Healthcare Materials, EarlyView.
This work introduces photo‐crosslinkable tyraminated poly(vinyl alcohol)‐gelatin (PVA‐GT) hydrogels as tunable injectable platforms for tissue engineering and growth factor delivery applications. This schematic illustrates the two developed hydrogel formulations and the experimental workflow used to evaluate their physico‐chemical properties in vitro ...
Alessia Longoni, Gretel S. Major, Sam Arnold, Samuel Tomkins, Eugenia Spessot, Scott Loeffler, Kieran Lau, Richard Tan, Jessica Harte, Roslyn Kemp, Tess Reynolds, Jelena Rnjak‐Kovacina, Gary J. Hooper, Tim B. F. Woodfield, David C. Kieser, Khoon S. Lim   +15 more
wiley   +1 more source

Pulsed and Cyclic Voltammetric Studies of Phenols and Naphthols in Dimethylformamide in Presence of Sodium 4-Vinylbenzenesulfonate

Chemistry
The influence of sodium 4-vinylbenzenesulfonate on the electrooxidation of phenols and naphthols was studied in dimethylformamide (DMF). The usually observed deactivation of phenol in non-aqueous environments was suppressed upon addition of sodium 4 ...
László Kiss, András Kiss
doaj   +1 more source

Chiral phosphoric acid catalyzed aminative dearomatization of α-naphthols/Michael addition sequence

Nature Communications, 2019
Catalytic asymmetric dearomatization (CADA) reactions readily convert common aromatic compounds to diverse 3D chiral, polycyclic molecules. Here, the authors report an intermolecular asymmetric dearomatization of nucleophile-tethered α-naphthols ...
Zi-Lei Xia, Chao Zheng, Ren-Qi Xu, Shu-Li You   +3 more
doaj   +1 more source