87986-73-0Relevant academic research and scientific papers
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.
Monoazo dye whose color changes when an acid is added
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Paragraph 0046-0052; 0104-0107, (2016/10/10)
The present invention relates to a monoazo dye for detecting acid, which changes its color by adding acid or being exposed to acid and, more specifically a monoazo dye for detecting acid, which changes its color within seconds when being exposed to a small amount of strong acid and fiber products using the same wherein the monoazo dye for detecting acid can change its color in response to a small amount of strong acid and turns its color back by removing acid, and fiber dyed by using the monoazo dye has a high color fastness and accordingly has no discoloration due to laundry and sunlight. Therefore, a protective clothing using the fiber let workers know when they are exposed to acid or not on a real time basis and accordingly prevents a secondary big accident and another accident causing by harmful environment factors in accident sites.(AA) Acid adsorption(BB) Acid removalCOPYRIGHT KIPO 2015
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.
Thermal Z-E Isomerization of Azobenzenes. The Pressure, Solvent, and Substituent Effects
Asano, Tsutomu,Okada, Toshio
, p. 4387 - 4391 (2007/10/02)
The rates of thermal Z-E isomerization of 4-(dimethylamino)-4'-nitroazobenzene were measured in a variety of solvents, and the Kirkwood plot revealed that the rate constant increase is much larger in polar solvents than expected from the continuum theory.
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
Insecticide evaporator comprising a stabilizer
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, (2008/06/13)
Insecticide evaporator comprising at least one volatile phosphoric ester insecticide, an agent for stabilizing the said ester against decomposition by protonization and used in an amount of 0.2 to 20% based on the weight of phosphoric ester, characterized in that the stabilizing agent contains at least one compound selected from the compounds of the chemical class of 1,3-benzodioxoles and at least one diazene.
Evaporator system comprising a stabilized pesticidal phosphoric acid ester and method for stabilizing such ester enclosed in an evaporator
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, (2008/06/13)
An evaporator system adapted for emitting insect killing vapors of an insecticide therefrom and comprising a liquid or solid composition enclosed therein, said insecticide consisting in at least one volatile phosphoric acid ester which is stabilized by at least one diazene compound.
