- Synthesis method of malachite green salt
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The invention relates to a synthesis method of malachite green salt. The method completely abandons traditional synthesis methods in the prior art, and tries to adopt a brand new synthesis route. A Grignard reagent is prepared, and a nucleophilic addition is carried out to synthesize leucomalachite green, and it is accidentally found that the method has the advantages of very few byproducts, and very high yield of the product; the malachite green salt prepared from the synthesized leucomalachite contains few impurities, and can be used as a high-quality candidate for a malachite green standardsubstance; and compared with the traditional synthesis methods, the method of the invention has the advantages of mild reaction conditions, and simplicity in operation.
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Paragraph 0071-0078
(2019/12/25)
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- Two Amphoteric Silver Carbene Clusters
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Two highly labile silver carbene cluster complexes are described, which are unique in that they mark the transition point at which the carbene center transmutes from a fairly common NHC-like nucleophilic behavior to an electrophilic character befitting reactive silver carbene intermediates of relevance in various catalytic transformations. This amphoteric character is the distinguishing attribute of a μ-bridged donor/donor carbene entity that connects two silver atoms of triangular or tetrahedral metallic core units.
- Tskhovrebov, Alexander G.,Goddard, Richard,Fürstner, Alois
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p. 8089 - 8094
(2018/06/29)
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- Carbenium ion-carbinol equilibration for basic triarylmethane dyes: Relative reactivities of dyes in aq. solutions
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Equilibria and kinetics of carbenium ion-to-carbinol base reactions for a set of selected basic triarylmethane dyes in aq. buffer solutions of low ionic strength have been measured spectrophotometrically.Relative reactivities of the dyes towards nucleophilic attack by hydroxide ion, on the basis of both equilibrium constant and forward rate constant of the reaction, have been found to follow the same order: malachite green (MG)> brillant green (BG)>> Victoria pure blue BO(VB)> methyl violet (MV) = crystal violet (CV)> ethyl vioet (EV).A fairly good correlation between elec trophilicities of the dyes and ?R+ parameters of their 4-alkylamino substituents has been obtained
- Gupta, Susanta K. Sen,Arvind, Udai
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p. 998 - 1000
(2007/10/02)
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- MECHANISM OF OXIDATION OF LEUCO BASES OF TRIARYLMETHANE DYES BY OXYGEN
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The kinetics of the oxidation of the leuco bases of triarylmethane dyes by oxygen were investigated.It was established that the oxidating agent was the peroxy radicals of the solvent.The leuco base is oxidized in the protonated form.A mechanism which involves the formation of a complex between the protonated leuco base and the peroxy radical is proposed.The decomposition of the complex in the controlling stage of the process leads to the formation of the dye.
- Fedorova, T. M.,Kaliya, O. L.
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p. 1348 - 1352
(2007/10/02)
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