87986-73-0Relevant articles and documents
Method for highly stereoselective preparation of trans-aromatic tertiary amine azo compound
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Paragraph 0018, (2018/07/30)
The invention provides a method for efficient and highly stereoselective preparation of an azo compound through para C-H bond selective activity of an organic aromatic tertiary amine. According to themethod, a Bronsted acid is adopted as a catalyst, an aromatic diazonium tetrafluoroboric acid compound and an organic aromatic tertiary amine compound are adopted as reaction substrates, and an organic solvent is put into a reaction system. The method has the advantages that the catalyst is cheap and easy to obtain, high in substrate applicability, gentle in reaction condition and safe and reliable; the selectivity of a target product is approximate to 100%, the E/Z selectivity of the target product is greater than 99:1, and relatively high yield is achieved; and by adopting the method, the defects that a conventional method for synthesizing different aromatic functional groups to replace organic aromatic tertiary amine azo compounds is harsh in reaction condition, poor in reaction selectivity, tedious in experiment step, low in yield, harmful to the environment since reagents harmful to the environment are used, and the like, can be overcome, and good industrial application prospectscan be achieved. The invention further provides an organic aromatic tertiary amine azo compound with different aryl substituted functional groups.
Studies on UV/VIS Absorption Spectra of Azo Dyes. XV. An Analysis of the Absorption Spectra of 4,4'-Diaminoazobenzenes
Haessner, C.,Mustroph, H.
, p. 113 - 119 (2007/10/02)
In the visible absorption spectrum 4,4'-bis-diethylaminoazobenzene shows two absorption maxima (λmax = 426 nm and λmax = 477 nm) with high intensity.Quantum chemical calculations and examinations by peak separation of six 4-substituted azobenzenes and six 4'-substituted 4-diethylaminoazobenzenes (1a-k) indicate that the longest wavelenght band is due to a n-?* transition and the other band is due to a ?-?*-transition.This is verified using an inrement system for ?-?* absorption maxima.A linear relation is found between intensity ratios of the two bands and the HAMMETT-?-constants of the substituents.With increasing electron releasing tendency of the substituents the absorption intensity of the n-?*-band increases.
SOLVENT AND SUBSTITUENT EFFECTS ON THERMAL CIS-TRANS-ISOMERIZATION OF SOME 4-DIETHYLAMINOAZOBENZENES
Marcandalli, Bruno,Pellicciari-Di Liddo, Livia,Di Fede, Cinzia,Bellobono, Ignazio Renato
, p. 589 - 594 (2007/10/02)
Thermal cis-trans-isomerization of some 4'-substituted 4-diethylaminoazobenzenes has been studied.Substitution in the 4'-position leads invariably to an acceleration of the reaction regardless of the nature of the substituent.Logarithms of kinetic constan
