Upper critical solution temperatures for immiscible solvent systems with halide salts, carboxylic acids, surfactants and polynuclear aromatic compounds and benzene derivatives

2007 ◽  
Vol 39 (2) ◽  
pp. 240-246 ◽  
Author(s):  
Man Singh
Keyword(s):  
Carboxylic Acids ◽  
Aromatic Compounds ◽  
Benzene Derivatives ◽  
Solvent Systems ◽  
Halide Salts ◽  
Critical Solution Temperatures

NMR-spektroskopische Untersuchungen über zwischenmolekulare Wechselwirkungen bei Benzolderivaten und Pyrrol / NMR-Spectroscopic Investigation of the Intermolecular Reactions of Benzene Derivatives and Pyrrole

1969 ◽  
Vol 24 (11) ◽  
pp. 1365-1370 ◽  
Author(s):  
H.-H. Perkampus ◽  
U. Krüger ◽  
W. Krüger
Keyword(s):  
Dipole Moment ◽  
Temperature Dependence ◽  
Aromatic Compounds ◽  
Spectroscopic Investigation ◽  
Chemical Shifts ◽  
Benzene Derivatives ◽  
Intermolecular Reactions ◽  
Proton Chemical Shifts

The proton chemical shifts of aromatic compounds are strongly concentration dependent. Moreever, for molecules with a dipole moment a temperature dependence of the proton chemical shifts is observed. For hemellitone, p-methylanisole, o-chlortoluene, p-chlortoluene, pyrrole and N-methyl-pyrrole the enthalpies of a dipole-dipole association between -0,7 and -1,8 Kcal could be estimated by NMR measurements combined with the temperature dependence in the whole range of the molefraction (0 → 1).

CHROMATOGRAPHIC CHARACTERISTICS OF SOME AROMATIC COMPOUNDS OF BIOLOGICAL INTEREST

1961 ◽  
Vol 39 (3) ◽  
pp. 605-627 ◽  
Author(s):  
E. G. McGeer ◽  
M. C. Robertson ◽  
P. L. McGeer
Keyword(s):  
Phenolic Acids ◽  
Aromatic Compounds ◽  
Chromatographic Data ◽  
Biological Interest ◽  
Solvent Systems ◽  
Color Reactions ◽  
Spray Reagents

Paper chromatographic data are reported on 220 aromatic compounds of biological interest, including phenolic acids, indoles, imidazoles, purines, pyrimidines, and some miscellaneous substances. Rf data in four solvent systems and color reactions with 12 spray reagents are tabulated. Some correlations between structure of these compounds, relative Rf, and color with various spray reagents are noted.

scholarly journals Thiophene, Furans, and Related Aromatic Compounds from Eupatorium heterophyllum

2011 ◽  
Vol 6 (3) ◽  
pp. 1934578X1100600
Author(s):  
Yoshinori Saito ◽  
Koji Takiguchi ◽  
Xun Gong ◽  
Chiaki Kuroda ◽  
Motoo Tori
Keyword(s):  
Aromatic Compounds ◽  
Chemical Transformations ◽  
Benzene Derivatives ◽  
Spectroscopic Analyses

A thiophene, two furans, a dihydro furan, and two acetylenic benzene derivatives were isolated from the roots of Eupatorium heterophyllum collected in China. Structures were established on the basis of spectroscopic analyses as well as chemical transformations.

Tf2O as a rapid and efficient promoter for the dehydrative Friedel–Crafts acylation of aromatic compounds with carboxylic acids

2007 ◽  
Vol 48 (24) ◽  
pp. 4199-4202 ◽  
Author(s):  
Mohammd Mehdi Khodaei ◽  
Abdolhamid Alizadeh ◽  
Ehsan Nazari
Keyword(s):  
Carboxylic Acids ◽  
Aromatic Compounds

Acylation of aromatic substrates with ketenes. II. Hammett–Brown studies on substituted aromatic compounds

1980 ◽  
Vol 58 (18) ◽  
pp. 1939-1946 ◽  
Author(s):  
K. R. Fountain ◽  
Pamela Heinze ◽  
Dave Maddex ◽  
Greg Gerhardt ◽  
Paul John
Keyword(s):  
Complex Formation ◽  
Aromatic Compounds ◽  
Benzene Derivatives ◽  
Chloride Complexes ◽  
Line Segments ◽  
Aromatic Substrates ◽  
Π Complex ◽  
Partial Rate ◽  
Inorganic Complexes ◽  
Vinyl Cation

Competition reactions using dimethylketene (DMK) – aluminum chloride complexes on a variety of substituted benzene derivatives gave partial rate factors. The logs of these Pfx values when plotted versus σ+ values gave two line segments of ρ = −6.59 for less active substrates, and ρ = −0.92 for more active substrates. Similar results were found for diphenylketene (ρ = −9.47 and −1.07).These results were rationalized by analogy to vinyl cation alkylations. A pair of π complexes (outer then inner) occur between initial approach of the reagent and final, product-determining π-complex formation. In one of these complexes the C=C bond of the ketene complex may be able to back-bond in a manner similar to that found in inorganic complexes of CO and metals.

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