Results 61 to 70 of about 220,193 (199)

Ionic Liquid-Based Ultrasonic-Assisted Extraction of Alkaloids from Cacao (Theobroma cacao)

Chemical Engineering Transactions, 2018
Recent advances in the solid-liquid extraction have brought a large number of new techniques as ultrasonic assisted extraction (UAE). Different solvents such as alcohols, acetonitrile and chloroform are reported as extractors of added-value compounds ...
N.S. De Oliveira, A.S. Carlos, S. Mattedi, C.M.F. Soares, R. Lucena De Souza, A. Fricks, A. Silva Lima   +6 more
doaj   +1 more source

Nucleofugality and Nucleophilicity of Fluoride in Protic Solvents

, 2016
A series of p-substituted benzhydryl fluorides (diarylfluoromethanes) were prepared and subjected to solvolysis reactions, which were followed conductometrically.
Johannes Ammer (1353501), Herbert Mayr (1353507), Christoph Nolte (2096014)   +2 more
core   +1 more source

Fluorescence, Absorption, Chromatography and Structural Transformation of Chelerythrine and Ethoxychelerythrine in Protic Solvents: A Comparative Study. [PDF]

Molecules, 2022
Cao J, Zheng Y, Zheng Y, Liu T, Liu J, Liu J, Wang J, Sun Q, Li W, Wei Y.   +9 more
europepmc   +1 more source

Synthesis and Characterization of Trivalent Cerium Complexes of p-tert-Butylcalix[4,6,8]Arenes: Effect of Organic Solvents

Journal of Chemistry, 2013
Reaction of Ce3+ with p-tert-butylcalix[n]arene (n=4,6,8) yields purple crystalline complexes structurally as [Ce(p-tert-butylcalix[4]arene-3H)2(NO3)(DMF)x](2 − x)DMF (1), [Ce(p-tert-butylcalix[6]arene-4H)2(NO3)(DMF)x](3 − x)DMF (2), and [Ce(p-tert ...
Md. Hasan Zahir
doaj   +1 more source

A Method of Calculating the Kamlet–Abboud–Taft Solvatochromic Parameters Using COSMO-RS

Molecules, 2019
There is demand for safer and bio-based solvents, brought on by legislation and sustainability objectives. The prediction of physical properties is highly desirable to help design new molecules.
James Sherwood, Joe Granelli, Con R. McElroy, James H. Clark   +3 more
doaj   +1 more source

Protic ionic liquids as catalysts for a three-component coupling/hydroarylation/dehydrogenation tandem reaction

, 2018
Protic ionic liquids with nitrate anions were used as solvents and catalysts for a three-component oxidative dehydrogenation tandem reaction via the coupling and hydroarylation of benzaldehyde, aniline, and phenylacetylene to a quinoline derivative.
Maren Muntzeck, René Wilhelm
core   +1 more source

The electronic origin of the ground state spectral features and excited state deactivation in cycloalkanones: the role of intermolecular H-bonding in neat and binary mixtures of solvents

, 2022
In this study, a D–A cycloalkanone (K1) has been investigated by steady state absorption and fluorescence in neat solvents and in three binary mixtures of nonpolar aprotic/polar protic, polar aprotic/polar protic, and polar protic/polar protic solvents ...
Ibrahim Ahmed Z. Al-Ansari (4846957)
core   +1 more source

First-order hyperpolarizabilities and pKa of weak organic acids in protic solvents are lineraly related

, 1995
Second-order nonlinearities (beta) of five weak organic acids in protic solvents have been measured by the double-quantum Rayleigh scattering (DRS) technique.
Ray, Paresh Chandra, Das, Puspendu Kumar
core  

Photosensitized Oxidation of Isoeugenol in Protic and Aprotic Solvents.

Chemical and Pharmaceutical Bulletin, 1991
化學系 ; 理學院 ...
Chen, Y. L., Wang, L. M., Kuo, Yueh-Hsiung   +2 more
openaire   +2 more sources

Bromination of Alkenes and Related Compounds by Use of Benzyltrimethylammonium Tribromide in Aprotic and Protic Solvents

, 1988
The reaction of alkenes and related compounds (1) with benzyltrimethyl-ammonium tribromide (BTMA Br_3) in aprotic solvents such as dichloromethane and chloroform gave 1, 2-dibromo adducts in fairly good yields.
柿並, 孝明, Fujisaki, Shizuo, 梶返, 昭二, Tashiro, Masashi, 田代, 昌士, Kajigaeshi, Shoji, Kakinami, Takaaki, Moriwaki, Masayuki, 藤崎, 静男   +8 more
core