Dissociation constants and infrared spectra of boron trifluoride complexes of substituted benzamides

1967 ◽  
pp. 253 ◽  
Author(s):  
B. M. J. Ellul ◽  
R. B. Moodie
Keyword(s):  
Infrared Spectra ◽  
Boron Trifluoride ◽  
Dissociation Constants ◽  
Substituted Benzamides

CHEMISTRY OF THE TRIFLUOROMETHYL GROUP: PART V. INFRARED SPECTRA OF SOME PHOSPHORUS COMPOUNDS CONTAINING CF3

1962 ◽  
Vol 40 (3) ◽  
pp. 393-398 ◽  
Author(s):  
M. A. A. Beg ◽  
H. C. Clark
Keyword(s):  
General Formula ◽  
Infrared Spectra ◽  
Boron Trifluoride ◽  
Phosphorus Compounds ◽  
Trifluoromethyl Group ◽  
Absorption Bands ◽  
Group Part

The infrared spectra of several series of trifluoromethyl-phosphorus compounds are correlated, the compounds examined being the iodides CF3PI2 and (CF3)2PI, the methyl-trifluoromethyl-phosphines of the general formula (CH3)nP(CF3)3−n, where n = 1, 2, or 3, and the analogous phenyl-trifluoromethyl-phosphines. Satisfactory assignments are made for the majority of absorption bands in the 650–4000 cm−1 region. The infrared spectra of some phosphine – boron trifluoride adducts are also examined and assignments of the principal bands are made.

COORDINATION COMPOUNDS OF HYDRAZINE: PART III. THE INTERACTION OF SILICON TETRAFLUORIDE WITH HYDRAZINE

1963 ◽  
Vol 41 (4) ◽  
pp. 876-882 ◽  
Author(s):  
R. C. Aggarwal ◽  
M. Onyszchuk
Keyword(s):  
Hydrogen Chloride ◽  
Organic Solvents ◽  
Infrared Spectra ◽  
Hydrofluoric Acid ◽  
Coordination Compounds ◽  
Boron Trifluoride ◽  
Silicon Tetrafluoride ◽  
Volatile Solid ◽  
Octahedral Structure

Silicon tetrafluoride and hydrazine react in a vacuum to produce a white, non-volatile, solid, 1:2 complex, SiF4.2N2H4. This compound sublimes with decomposition above 200° and is insoluble in common organic solvents. It reacts with (a) 55% hydrofluoric acid, (b) anhydrous hydrogen chloride, (c) ethylenediamine, (d) ammonia, and (e) boron trifluoride, producing: (a) (N2H5+)2SiF62−, (b) N2H5+Cl−, (c) SiF4.NH2(CH2)2NH2, (d) SiF4.2NH3, and (e) BF3.N2H4. A comparison of the infrared spectra of SiF4.2NH3, SiF4.2N2H4, and SiF4.NH2(CH2)2NH2 suggests that all three complexes have cis octahedral structure.

scholarly journals Determination and structural correlation of pK BH + for meta- and para- substituted benzamides in sulfuric acid solutions

2006 ◽  
Vol 71 (10) ◽  
pp. 1061-1071 ◽  
Author(s):  
Goran Stojkovic ◽  
Emil Popovski
Keyword(s):  
Sulfuric Acid ◽  
Dissociation Constants ◽  
Uv Spectroscopy ◽  
Principal Component ◽  
Medium Effect ◽  
Acid Solutions ◽  
Structural Correlation ◽  
Total Variability ◽  
Substituted Benzamides ◽  
Sulfuric Acid Solutions

The protonation of some meta and para substituted benzamides in sulfuric acid solutions was studied by UV spectroscopy in the 190-350 nm region. Principal component analysis was applied to separate the effect of protonation from the medium effect. The spectral region 200-350nm was used for the calculation of the ionization ratio from coefficient of the first principal component, which explains about 95-98% of the total variability. The dissociation constants as well as the solvation parameters m* and ? were calculated using the excess acidity method and the Bunnett-Olsen method. The pK BH + values obtained with the H A function (defined by the average m* - values) are in satisfactory agreement with those calculated with the previously mentioned methods. The pK BH + values were correlated with structure using the Hammett (?=-0.91) and Taft approach. It was found that the inductive effect is more relevant than the resonance one for both substituted benzamides (meta and para). .

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