Chemistry Journal of Moldova

2022 Volume 17, no.2

Author(s):

Rajendra Patil, Jagdish Chavan, Shivnath Patel, Vaishali Shinde, Anil Beldar


Field: Organic chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 101-108
Keywords: Biginelli reaction, acetic acid, acidic charcoal, microwave irradiation.
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Graphical Abstract: A green and efficient method for the multicomponent synthesis of 3,4-dihydropyrimidin-2(1H)-ones and -thiones using acetic acid supported on activated charcoal as a mild acid catalyst in ethanol under both conventional as well as microwave irradiation conditions has been developed. The catalyst system found more efficient under microwave irradiation conditions than conventional conditions with shorter reaction times and excellent yields.


 


Downloads: 46

Author(s):

Tudor Lupascu and Maria Sandu


Field: Ecological chemistry
Type: Invited paper
Issue: 2022 Volume 17, no.2
Pages: 7-18
Keywords: water, wastewater, chemical composition, treatment technology, pollutant.
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Graphical Abstract: This paper presents the the main scientific and innovative results are presented, which were obtained by the talented chemist and renowned ecologist Valeriu Ropot throughout his scientific career. The results of scientific investigations are bestowed and analysed concerning the quality of the waters of the Dniester and the Prut Rivers, Dubasari reservoirs on the Dniester River, as well as the main bodies of water in the Republic of Moldova. The paper also includes the practical recommendations for reducing the negative impact on the environment, of the discharge of hundreds of thousands of tons of brine into the Dniester River as a result of the accident at the mineral fertilizer plant in the city of Stebnik, Ukraine. Moreover, the paper presents the results of studies aimed at developing methods for determining organic and inorganic pollutants in natural waters.


 


Downloads: 28

Author(s):

Angela Gurev, Veronica Dragancea, Alexei Baerle, Natalia Netreba, Olga Boestean, Svetlana Haritonov, Boris Gaina


Field: Food chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 50-61
Keywords: antioxidant, flavonoid, grape seed, polyphenol, waste.
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Abstract (PDF)
Graphical Abstract:
The composition of the lipophilic and hydrophilic extracts from the Feteasca Neagra ground seeds, grown in three different vineyards, was studied. The physicochemical indicators of the seeds, the oil quality indicators and the total content of polyphenols and flavonoids in the extracts were determined.  Some phenolic and flavanol constituents were identified and quantified using reversed-phase HPLC by gradient-elution. The Trolox equivalent antioxidant capacity assay proved the increased antioxidant activity of the hydrophilic extracts, with the highest DPPH• scavenging effect of almost 91.70 and 93.81%, an equivalent of 281.66 and 288.27 µM/L Trolox. It was concluded that the seeds recovered from Feteasca Neagra by-products are a rich source of functional compounds, with significant antioxidant properties. 


 



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Author(s):

Dhanraj Kamble, Anil Shankarwar, Yuvraj Sarnikar, Radhakrushna Tigote, Mubarak Shaikh, Pravin Chavan


Field: Organic chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 94-100
Keywords: one pot reaction, substituted benzimidazole, ultrasound irradiation, ZnFe2O4 catalyst, biological activity.
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Graphical Abstract: Herein, an efficient one-pot synthesis is described, of substituted benzimidazole derivatives (3a-j) from a condensation of various o-phenylenediamine (1a-j) aromatic aldehyde (2a-j) using ZnFe2O4 as a nano-catalyst under ultrasonic irradiation conditions. All forms of aldehydes with an electron releasing or electron –withdrawing substituent have a significant yield. The catalyst can easily be recovered after completion of the reaction and reused without affecting its activity. Prepared benzimidazole derivatives showed moderate to good anti-tuberculosis results.


 



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Author(s):

Alexandru Ciocarlan


Field: Natural product chemistry and synthesis
Type: Review
Issue: 2022 Volume 17, no.2
Pages: 19-34
Keywords: (-)-sclareol, norlabdane-heterocyclic compound, antimicrobial activity, biological activity.
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Graphical Abstract: This review relates to chemistry of the well-known biologically active natural labdane diterpenoid (-)-sclareol easily available from Clary sage (Salvia sclarea L.). It is mainly used in industry, especially for synthesis of fragrance compounds and natural analogs. The paper covers achievements on the synthesis, structure determination and biological activity of molecular hybrid compounds bearing hydrazide and thiosemicarbazone fragments or diazine, 1,2,4-triazole, carbazole, 1,3-thiazole, 1,3,4-oxadiazole, 1,3,4-thiadiazole units prepared based on it. 


 



Downloads: 19

Author(s):

Viacheslav Shvydkiy, Sergei Dolgov, Alexander Dubovik, Mikhail Kozlov, Alisa Povkh, Lyudmila Shishkina, Gheorghe Duca


Field: Ecological chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 35-42
Keywords: lecithin, hydrochemical index, water quality, UV-Vis spectroscopy, Gauss method.
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Abstract (PDF)
Graphical Abstract:
This paper presents a study of the hydrochemical composition and physicochemical properties of natural water samples from various sources in the Voronezh and Moscow regions. Two model systems are proposed for assessing the state of the aquatic environment: UV spectroscopy with spectrum decomposition by the Gauss method and spontaneous aggregation of lecithin in a polar medium. Based on the performed investigation, it was determined that the size of lecithin aggregates decreases, and the value of their zeta potential increases with an increase in the content of hydrophobic compounds in natural water.


 


Downloads: 27

Author(s):

Lyubov Patrylak, Stepan Zubenko, Serhyi Konovalov, Anzhela Yakovenko, Volodymyr Povazhnyi, Oleksandra Pertko, Yulia Voloshyna, Oleksandr Melnychuk, Mykhailo Filonenko


Field: Natural product chemistry and synthesis
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 84-93
Keywords: kaolin, zeolite, limonene isomerization, terpinolene yield.
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Abstract (PDF)
Graphical Abstract:
The aim of the work was to study the isomerization of limonene on zeolite-containing biporous acid catalysts based on kaolin (from Ukraine). Results of this study show that at 160°C, the maximum isomer yield was 60–65% with an 80–90% conversion. The studied samples do not have a significant accumulation of carbonaceous deposits because limonene has high solubility, which helps to remove intermediate products of transformation from the surface of the samples. 


 


Downloads: 19

Author(s):

Dumitru Ureche, Ion Bulhac, Sergiu Shova, Paulina Bourosh


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 62-72
Keywords: dianilineglyoxime, zinc complex, nickel unidimensional coordination polymer, benzenedicarboxylic acid, X-ray crystallography.
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Abstract (PDF)
Graphical Abstract:
Two coordinating compounds of zinc(II) (1) [Zn2(DAnH2)2(1,3-bdc)2(DMSO)4] and nickel(II) (2) [Ni(DAnH2)(1,4-bdc)(DMF)2]n were obtained based on dianilineglyoxime (DAnH2), 1,3-benzenedicarboxylic acid (1,3-bdcH2) and 1,4-benzenedicarboxylic acid (1,4-bdcH2), where DMSO is dimethylsulfoxide and DMF is dimethylformamide. The molecular and crystalline structure of reported compounds were established by infrared spectroscopy and single crystal X-ray diffraction, and for 1, additionally, the 1H and 13C NMR spectroscopy was used. According to data, the Zn(II) molecular complex is a binuclear and the Ni(II) is a 1D polymer compound. 


 


Downloads: 26

Author(s):

Oksana Stavinskaya, Iryna Laguta, Pavlo Kuzema, Iryna Skorochod, Alla Roy, Ivan Kurdish


Field: Ecological chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 43-49
Keywords: caffeic acid, fumed silica, composite, antioxidant, radical scavenger, antimicrobial activity.
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Abstract (PDF)
Graphical Abstract:
 The work was aimed at preparing the CA+A300 composite consisting of caffeic acid (CA) and fumed silica (A300) and at comparing the properties of CA in the solution and in the composite. The results showed that the solution and the composite are effective antioxidant/antimicrobial agents and that inclusion of CA in the CA+A300 composite provides its gradual release into solutions and reaction mixtures, thus ensuring a prolonged action of the compound.


 


Downloads: 21

Author(s):

Ozan Süleyman Ürgüt, Aydin Tavman, Muazzez Gürgan Eser


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2022 Volume 17, no.2
Pages: 73-83
Keywords: azomethine, binuclear complex, organometallic, transition metal complex, antibacterial activity.
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Abstract (PDF)
Supplementary Material (PDF)

Graphical Abstract: 6-Chloro-2-ferrocenyl-1H-benzimidazole and (E)-((4-chloro-2-hydroxyphenylimino)methyl)ferrocene ligands and their Fe(III), Co(II), Cu(II), Zn(II) and Pd(II) complexes were synthesized. The structure of ligands and metal complexes has been investigated by different methods. In addition, magnetic moment, molar conductivity measurements and antibacterial activity of the ligands and the complexes were investigated.


 


Downloads: 32