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One-step Selective Synthesis of 13-epi-manoyl Oxide 13-环氧壬基氧化物的一步选择性合成
IF 0.5
Chemistry Journal of Moldova Pub Date : 2021-05-01 DOI: 10.19261/CJM.2021.820
O. Morarescu, Marionela Traistari, A. Barba, G. Duca, N. Ungur, V. Kulcițki
{"title":"One-step Selective Synthesis of 13-epi-manoyl Oxide","authors":"O. Morarescu, Marionela Traistari, A. Barba, G. Duca, N. Ungur, V. Kulcițki","doi":"10.19261/CJM.2021.820","DOIUrl":"https://doi.org/10.19261/CJM.2021.820","url":null,"abstract":"The selective one-step synthesis of 13-epi-manoyl oxide is reported based on a low-temperature superacidic cyclization of sclareol. The reaction conditions have been finely tuned in order to achieve a 9:1 ratio between epimeric oxides in favour of the desired 13-epi-oxide. The structures were confirmed by H and C NMR, and composition of the crude reaction products determined by GC-MS. These results have been interpreted by a hypothetical SN2 mechanism which occurs with inversion of configuration around the C-13 chiral center of the starting substrate. The preparative value of the elaborated procedure is demonstrated on a gram-scale experiment.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"12 1","pages":"99-104"},"PeriodicalIF":0.5,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85669720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The Stoichiometric Uniqueness of Multiple Chemical Reaction Systems in Chemical Thermodynamics, Kinetics and Catalysis – Contributions of Professor Ilie Fishtik 化学热力学、动力学和催化中多种化学反应系统的化学计量唯一性——Ilie Fishtik教授的贡献
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.803
Igor Povar
{"title":"The Stoichiometric Uniqueness of Multiple Chemical Reaction Systems in Chemical Thermodynamics, Kinetics and Catalysis – Contributions of Professor Ilie Fishtik","authors":"Igor Povar","doi":"10.19261/cjm.2020.803","DOIUrl":"https://doi.org/10.19261/cjm.2020.803","url":null,"abstract":"The main scientific achievements of great significance accomplished by Professor Ilie Fishtik at the University of Iowa and the Worcester Polytechnic Institute, in several fields of the physical chemistry as chemical thermodynamics, kinetics and heterogeneous catalysis were revealed and briefly analysed. Fundamental equations of chemical thermodynamics within the De Donder (stoichiometric) approach were reformulated in terms of a special class of chemical reactions, called as response reactions. Using this approach, the unusual behaviour of chemical equilibrium systems, to interpret the apparent contradictions to Le Chatelier principle and to discover hitherto unnoticed thermodynamic identities, was rationalised. The stabilities of chemical species were formulated in terms of a certain class of stoichiometrically unique chemical reactions and their thermochemical characteristics. A completely new approach for the generation and simplification of kinetic mechanisms for complex reaction systems was developed and applied. Based on a new type of reaction networks, referred to as reaction route graphs, a systematic method of analysis and reduction of a microkinetic mechanism was established and employed.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"43 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77636595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Variations of Phosphorus, Sulphur and Nitrogen Content in Lichens in the Former Manufacturing Areas 原生产区地衣中磷、硫、氮含量的变化
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.751
V. Lazarenko, Z. Balcerbule, V. Rudoviča, A. Viksna
{"title":"Variations of Phosphorus, Sulphur and Nitrogen Content in Lichens in the Former Manufacturing Areas","authors":"V. Lazarenko, Z. Balcerbule, V. Rudoviča, A. Viksna","doi":"10.19261/cjm.2020.751","DOIUrl":"https://doi.org/10.19261/cjm.2020.751","url":null,"abstract":"The aim of this research work was to evaluate the pollution level of phosphorus, sulphur and nitrogen in the former manufacturing areas (the former Kuprava drainage pipe factory and landfill site) and compare it with the Sita forest area levels using lichens as bioindicators. Additionally, the correlation between the content of these elements in lichens and soil was examined. The research results show that in the former drainage pipe factory area and landfill site, the levels of phosphorus, sulphur and nitrogen content were elevated in comparison with Sita forest. In the case of phosphorus and nitrogen contents, a positive correlation was observed between soil and lichen samples.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"78 1","pages":"38-44"},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82849742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Compounds Removed from the Condensation Reaction between 2-acetylpyridine and 2-formylpyridine. Synthesis, Crystal Structure and Biological Evaluation 从2-乙酰基吡啶和2-甲酰吡啶缩合反应中得到的化合物。合成、晶体结构及生物学评价
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.695
R. Rusnac, M. Botnaru, N. Barba, P. Petrenko, Y. Chumakov, A. Gulea
{"title":"Compounds Removed from the Condensation Reaction between 2-acetylpyridine and 2-formylpyridine. Synthesis, Crystal Structure and Biological Evaluation","authors":"R. Rusnac, M. Botnaru, N. Barba, P. Petrenko, Y. Chumakov, A. Gulea","doi":"10.19261/cjm.2020.695","DOIUrl":"https://doi.org/10.19261/cjm.2020.695","url":null,"abstract":"The research is devoted to the study of unexpected products that formed as a result of the condensation reaction between 2-acetylpyridine and 2-formylpyridine under the Claisen-Schmidt reaction conditions. The structure of the compounds was determined and confirmed using FTIR, H and C NMR spectroscopy, and X-ray diffraction technique. As a result, a sequence of reactions leading to the following compounds has been proposed: 1,3-bis(pyridin-2-yl)prop-2-en-1-one (3); 1,3,5-tri(pyridin-2-yl)pentane-1,5-dione (4); (2,4-dihydroxy-2,4,6-tri(pyridin-2-yl)cyclohexyl)(pyridin2-yl)methanone (5) and (4-hydroxy-2,4,6-tri(pyridin-2-yl)cyclohexane-1,3-diyl)bis(pyridin-2ylmethanone) (6) as well as 2-formylpyridine (1) and 2-acetylpyridine (2). The plausible mechanisms of these chemical transformations and synthetic methods for obtaining substituted cyclohexanol derivatives are also presented. The synthesized compounds were tested for antimicrobial and antioxidant activity. The obtained results show that the compounds 4-6 have moderate antifungal activity. The activity of compound 6 is nine times higher towards Cryptococcus neoformans than the activity of Nistatin that is used in medical practice. The present experimental results show that compound 6 has potential application in antibacterial and antifungal areas.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"34 1","pages":"88-98"},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90445407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Innovative Processes for Gold Recovery from Romanian Mining Wastes 创新工艺在罗马尼亚矿业废金回收中的应用
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.718
S. Ubaldini, I. Povar, T. Lupascu, O. Spînu, Francesca Trapasso, D. Passeri, S. Carloni, D. Guglietta
{"title":"Application of Innovative Processes for Gold Recovery from Romanian Mining Wastes","authors":"S. Ubaldini, I. Povar, T. Lupascu, O. Spînu, Francesca Trapasso, D. Passeri, S. Carloni, D. Guglietta","doi":"10.19261/cjm.2020.718","DOIUrl":"https://doi.org/10.19261/cjm.2020.718","url":null,"abstract":"The application of a new hydrometallurgical process for gold extraction by thiosulphate leaching from Romanian mining wastes, coming from Balan and Deva deposits, was studied. There was obtained 85% of Au extraction after leaching; moreover, an integrated flow-sheet, including recycling of process solution and carbon, was outlined, based on results obtained at a laboratory scale, using a schematic chemical circuit of treatment. Global recovery of the process (leaching-adsorption-desorption-electrodeposition) of about 75-80% of Au was achieved. The developed integrated flow-sheet, allows to recycle the reagents during the process, with a loss of only 5-10%, in particular thiosulphate and alcohol, for each complete circuit of treatment.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"3 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81895731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
LC-MS Analysis and Antioxidant Activity of the Hydro-alcoholic Extract of Melissa Officinalis L. From Algeria 阿尔及利亚梅丽莎水醇提取物的LC-MS分析及抗氧化活性研究
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.778
B. Aicha, R. Rouabhi, S. Gasmi, C. Bensouici, H. Mohammedi, Imad Mennai
{"title":"LC-MS Analysis and Antioxidant Activity of the Hydro-alcoholic Extract of Melissa Officinalis L. From Algeria","authors":"B. Aicha, R. Rouabhi, S. Gasmi, C. Bensouici, H. Mohammedi, Imad Mennai","doi":"10.19261/cjm.2020.778","DOIUrl":"https://doi.org/10.19261/cjm.2020.778","url":null,"abstract":"The present work focuses on evaluation of the chemical composition and antioxidant activity of the hydro-methanolic extract of Melissa officinalis L. from Algeria. The liquid chromatography-mass spectrometry analysis allowed the identification of six compounds: caffeic acid, caftaric acid, hydroxyjasmonic acid glucoside, caftaric acid glucoside, rosmarinic acid and sagerinic acid. The in-vitro antioxidant activity of the hydro-methanolic extract was evaluated by using four different methods including: radical scavenging assay (DPPH), scavenging activity (ABTS), cupric reducing antioxidant capacity (CUPRAC), and ferric reducing power assay. The extract exhibited a relatively strong antioxidant activity compared to the synthetic antioxidants. The highest radical scavenging activity was registered using DPPH and ABTS methods, IC50= 20.53±2.64 μg/mL and 22.50±0.67 μg/mL, respectively. These results suggest that Melissa officinalis L. could be considered a potential source of natural antioxidants with potential interest in the agrochemical and pharmaceutical industries.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"15 1","pages":"78-87"},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73587457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Use of Some Non-conventional Methods in Chemistry of Bicyclohomofarnesenic Methyl Esters 几种非常规化学方法在双环二聚甲醛甲酯合成中的应用
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.791
A. Ciocarlan, L. Lungu, S. Blaja, I. Dragalin, A. Aricu
{"title":"The Use of Some Non-conventional Methods in Chemistry of Bicyclohomofarnesenic Methyl Esters","authors":"A. Ciocarlan, L. Lungu, S. Blaja, I. Dragalin, A. Aricu","doi":"10.19261/cjm.2020.791","DOIUrl":"https://doi.org/10.19261/cjm.2020.791","url":null,"abstract":"The present paper reports the results of microwave irradiation assisted method for the preparation of bicyclohomofarnesenic methyl esters versus classical Stoll and Hinder method. Moreover, the chemical transformations of bicyclohomofarnesenic methyl esters via anodic electrooxidation and dye-sensitized photooxidation were performed. A new method for the preparation of methyl 7-oxo-13,14,15,16-tetranorlabd-6,8(8)-dien-12-oate and the mechanism of electrochemical products formation are presented. The structure of all synthesized compounds was fully confirmed by spectral methods.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"5 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72906655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Synthesis and Structural Characterization of the Tetranuclear Iron(Iii) Cluster with Salicylic Acid 水杨酸四核铁(Iii)簇的合成与结构表征
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.758
Viorina Gorinchoy
{"title":"Synthesis and Structural Characterization of the Tetranuclear Iron(Iii) Cluster with Salicylic Acid","authors":"Viorina Gorinchoy","doi":"10.19261/cjm.2020.758","DOIUrl":"https://doi.org/10.19261/cjm.2020.758","url":null,"abstract":"A new tetra-homonuclear iron(III) cluster, [Fe4O2(Sal)4(H2O)6]·4DMA·0.75H2O, where Sal= salicylic acid and DMA= N,N-dimethylacetamide consolidated via two µ3-oxo- and four salicylate-bridges was synthesized and characterized by IR spectroscopic method as well as by single crystal X-ray diffraction analysis. The structure of the obtained tetranuclear compound consists of four FeIII atoms in a “butterfly” arrangement. The coordination sphere of each of the two central FeIII atoms is generated by two μ3-oxo-bridging atoms and four oxygen atoms provided by the tridentate-bridging Sal2- ligands, while the coordination polyhedron of another two iron atoms involve six oxygen atoms from three water molecules, two salicylic and one μ3-oxigen atom. The Fe-O distances within Fe-O-Fe bridge are of 2.102(3) Å (for wing-body) and 2.038(3) Å (for body-body).","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"217 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79695544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Decolourisation of Beet Sugar Syrup Using Activated Carbon and Glucose Oxidase Enzyme 活性炭和葡萄糖氧化酶对甜菜糖浆脱色的研究
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.775
Pezhman Zolfaghari, Neda Imani Payandeh, Mortaza Golizadeh, A. Karimi, Amirali Ebadi Fard Azar
{"title":"Decolourisation of Beet Sugar Syrup Using Activated Carbon and Glucose Oxidase Enzyme","authors":"Pezhman Zolfaghari, Neda Imani Payandeh, Mortaza Golizadeh, A. Karimi, Amirali Ebadi Fard Azar","doi":"10.19261/cjm.2020.775","DOIUrl":"https://doi.org/10.19261/cjm.2020.775","url":null,"abstract":"This paper presents the development and optimization of a new approach which combines the utilization of activated carbon and glucose oxidase enzyme for decolourisation of beet sugar syrup. The combining of the physical adsorption with the enzymatic reaction was managed to improve the decolourisation of beet sugar syrup from 35.29 to 83.68% compared to the basic adsorption by activated carbon after 120 min of operation under the optimum conditions. The maximum decolourisation efficiency by the coupled process was achieved at glucose oxidase dosage of 0.07 g, glucose concentration of 20 mM, and solution pH 7 at the temperature of 30ºC using 0.01 g of activated carbon particles. Given the high effectiveness, reusability, and the eco-friendly nature of the process, the proposed method can serve as an alternative to ordinary decoloursation techniques.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"156 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79876040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Extracting Conditions Optimization and Bioactivity of Polysaccharides from the Pods of Haricot Vert 雪莲豆荚多糖提取工艺优化及生物活性研究
IF 0.5
Chemistry Journal of Moldova Pub Date : 2020-12-01 DOI: 10.19261/cjm.2020.795
N. Thuy, Do Hoang Giang, P. K. Linh, N. Dat
{"title":"Extracting Conditions Optimization and Bioactivity of Polysaccharides from the Pods of Haricot Vert","authors":"N. Thuy, Do Hoang Giang, P. K. Linh, N. Dat","doi":"10.19261/cjm.2020.795","DOIUrl":"https://doi.org/10.19261/cjm.2020.795","url":null,"abstract":"Polysaccharides from the pods of haricot vert (Phaseolus vulgaris L.) were extracted using a simple heating method, by varying extracting temperature, heating time, solid-to-liquid ratio, and solvent composition. The obtained results were processed using statistical analysis that helped to identify the optimal conditions for the polysaccharides’ extraction process. Moreover, the results of the bioassays were compared and statistically analysed to look for the correlation among extracting conditions, compositions, and bioactivities. The extracts of optimal conditions showed significant antioxidant and αamylase inhibition. Correlations among extracting conditions, compositions, and bioactivities were evaluated based on partial least square (PLS) regression model. Therefore, this study represents a promising production method of bioactive polysaccharides extract in the food and pharmaceutical industry.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"47 1","pages":"45-53"},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90762287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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