Dehydroacetic acid as a reagent for the separation and gravimetric determination of copper(II), aluminium and beryllium

Manku, G.S.; Sarpal, P.D.

doi:10.1016/0039-9140(71)80187-x

Cited by 4 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Відомі комплекси дегідрацетової кислоти з іонами перехідних та інших металів [1 -6], з фталоціанінатами цирконію та гафнію [7]. Вона запропонована як комплексоутворювач в аналітичній хімії для визначення іонів міді, алюмінію і берилію [8,9]. Анельований аналог дегідрацетової кислоти -3-ацетил-4-гідроксікумарин запропоновано для визначення іонів титану (IV), церію (IV) та ін.…”

unclassified

“…Анельований аналог дегідрацетової кислоти -3-ацетил-4-гідроксікумарин запропоновано для визначення іонів титану (IV), церію (IV) та ін. [9][10][11][12]. Електронну будову комплексів перехідних металів з дегідрацетовою кислотою досліджено в роботі [13].…”

unclassified

See 1 more Smart Citation

CRYSTAL STRUCTURE AND TAUTOMERISM OF ALKYLAMINO-β-KETOENOLS IN SOLUTIONS

Chernii

2019

Ukr. Chem. Journ.

View full text Add to dashboard Cite

The structure of alkylamino-β-ketoenols obtained by opening of the pyran cycle of chalcones based on dehydracetic acid was studied by X-ray diffraction, IR, 1H NMR spectroscopy and chromatography-mass spectrometry. The infrared spectra of the compounds appear to be typical of β-ketoenols. The crystalline structure (2Z,5Z,7E,9E)-6-hydroxy-2-(methylami-no)-10-phenylethoxy-2,5,7,9-tetraene-4-one was first determined. A comparative analysis of it with 2 pre-viously published structures has been carried out. All of these compounds are crystallized in the form of yellow plates in the monoclinic crystalline system (spatial group P21/n), they have a planar arrangement of the polyene chain and β-ketoenol fragment con-jugated to the aromatic ring. It has been established that the planar configuration of the β-ketoenol fragment is stabilized by hydrogen bonds between the hydroxy and keto group and the amino and keto group in the crystalline state. The length of the polymethine chain, the nature of the substituents in the aromatic and aliphatic part of the molecule do not significantly affect the size and geometry of the alkylamino-β-ketoenolate fragment. Approximately the same lengths of bonds, the distance between atoms and the corners indicate that all these com-pounds may have similar chelating properties. Ac-cording to 1H NMR spectroscopy in various deu-terated solvents (benzene, DMSO, chloroform, ace-tone, methanol and trifluoroacetic acid), most of the main signals of the obtained compounds have sa-tellites, which indicates the existence of several isomeric forms in solutions. The analysis of integral intensities of labile protons in 1H NMR spectra does not allow to obtain accurate results regarding the ratio of tautomers in a solution, but for a series of compounds their approximate ratio in chloroform, DMSO and trifluoroacetic acid have been established (from 70:30 in CDCl3 to 90:10 in DMSO and CF3CO2D). The stability of the tautomers in the solutions is confirmed by the data of chromatogra-phy-mass spectrometry.

show abstract

unclassified