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  • 1
    Electronic Resource
    Electronic Resource
    Flavonoide, XXXV Herstellung von α-Azido-2′ -oxychalkonen und ihre Umwandlung in 3-Aminoflavenone (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 174-180 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Flavonoids, XXXV1.-Synthesis of α-Azido-2′-oxychalcones and Their Transformation into 3-AminoflavenonesTeilweise vorgetragen auf dem 5. Ungarischen Bioflavonoid-Symposium. Mátrafüred, 1977; vgl.: T. Patonay, M. Rákosi, Gy. Litkei, T. Mester und R. Bogná in Flavonoids and Bioflavonoids, Current Research Trends, Proceedings of the 5th Hungarian Bioflavonoid Symposium, Mátrafüred, 25-27 May 1977 (L. Farkas, M. Gábor und F. Kállay), S. 227, Akadémia Kiadó, Budapest und Elsevier, Amsterdam 1977.The regioselective reaction of the benzylacetophenone dibromides 5a-d with sodium azide in dimethylformamide affords a 9:1 mixture of α-azido-2′-oxychalcones 4a-dand isoxazoles 7a, b, d. On treatment with bases 4a and4d are transformed into 3-aminoflavenone (11), whereas 4b gives the same product with acid. 4a-c give 2′-oxy-a-(triphenylphosphoranediylamino)chalcones 14a-c with triphenylphosphine, whereas 4d yields 2,3-trans-3-(triphenylphophoranediylamino)-flavanone (15) under the same conditions.
    Notes: In einer regioselektiven Reaktion werden aus den Benzylacetophenondibromiden 5a-d mil Natriumazid in Dimethylformamid die α-Azido-2′-oxychalkone 4a-d und Isooxazole 7a, b und dim Verhältnis 9:1 hergestellt. Aus 4a und d erhält man mit Basen und aus 4b mit Sauren 3-Aminoflavenon (11). Mit Triphenylphosphin bilden 4a-c die 2′-Oxy-a-(triphenylphosphorandiylamino)chalkone 14a-c, während 4d 2,3-trans 25-3-(Triphenylphosphorandiylamino)flavanon (15) liefert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790205
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  • 2
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    The Use of Sodium to Calibrate the Transport Modeling of Water Pollution in Sandy Formations Around an Uninsulated Sewage Disposal Site (2016)
    Springer
    Details
    Publication Date: 2016-01-08
    Print ISSN: 0049-6979
    Electronic ISSN: 1573-2932
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 3
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    Geovisualization Techniques of Spatial Environmental Data Using Different Visualization Tools (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-09-25
    Description: The appearance of online map services and frameworks (e.g., KML, QGIS) has increased the possibilities to easily, quickly and—in many cases—cost-effectively publish spatial data stored in databases. The aim of this study is to present the geovisualization of spatial databases of a Hungarian settlement on the web, using the open source webGIS system and Google application programming interfaces (APIs). The interactive point and interpolated distribution maps available online provide a detailed picture of the level of contamination, the spatial distribution of the ground water supply of the investigated settlement, and the changes which have occurred following the establishment of the sewage system. In the case of PO43− we determined that in the year before the sewage system was constructed, most of the area of the settlement could be considered contaminated, with the highest level of contamination measured in the central area of the settlement. Five years after the construction of the sewage system, the ratio of the contaminated areas had significantly decreased. In the case of NO3− we found a high level of contamination before the construction of the sewage system with a concentration increase in a North–West direction. After the establishment of the sewage system, the increase in concentration was the most intense in the central parts of the settlement, while the characteristic spatial distribution could no longer be observed. The geovisualization techniques developed are able to provide information about the different spatial data for users in a visual way, and also help to understand better the spatial information using a cognitive approach. The advantage of interactive web maps created with the technologies applied over traditional static maps is a new approach, which allows the user to manipulate the temporal and spatial data directly in the most appropriate way.
    Electronic ISSN: 2076-3417
    Topics: Natural Sciences in General
    Published by Molecular Diversity Preservation International
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  • 4
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    The effects of uninsulated sewage tanks on groundwater. A case study in an eastern Hungarian settlement (2017)
    De Gruyter
    Details
    Publication Date: 2017-06-01
    Description: In our study we attempt to demonstrate the effects of uninsulated sewage tanks, which are the most important sources of contamination in settlements without sewage systems, on groundwater quality. We compared the results of measurements carried out before and one and a half years after the construction of the sewage system. We established 3 m deep monitoring wells within a 25 m radius of a sewage tank, which were then sampled, and the level of groundwater was recorded. The 3D model constructed on the basis of the saturated zone shows that the effluent wastewater formed a groundwater level dome with a height of more than 1 m. After the sewage tank was taken out of use the difference between the highest and lowest groundwater levels decreased to a few centimetres. In our study we investigated the spatial distribution of NH4+(ammonium). Using the 3D model we were able to precisely determine the volume of water bodies with different levels of contamination. In an approximately 25 m3water body, in the immediate environment of a sewage tank in use we detected NH4+at a concentration which was characteristic of undiluted wastewater (〉90 mg·dm−3). After the sewage tank was taken out of use, the concentration in its immediate environment decreased by more than 50%, although almost everywhere in the modelled area concentrations were measured above the limit value. Based on the above, we can conclude that the cleaning process has started, but the complete decontamination of the groundwater will take several years.
    Print ISSN: 1429-7426
    Electronic ISSN: 2083-4535
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by De Gruyter
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  • 5
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    Assessment of Groundwater Quality Changes in the Rural Environment of the Hungarian Great Plain Based on Selected Water Quality Indicators (2020)
    Springer
    Details
    Publication Date: 2020-10-22
    Description: In the present study, changes in groundwater quality are assessed after the construction of the sewerage network, based on 3 water quality indices. Sampling took place before (2013) and after (2017, 2018, 2019) the establishment of a sewerage network in 2014. In the pre-sewerage period, strong pollution of the groundwater was detected. A total of 90% of the groundwater wells according to the water quality status by Brown, 70% of the wells according to the contamination index Cd by Rapant, and 80% of the wells according to the Canadian Council of Ministers of the Environmental Water Quality Index were categorized in the “polluted” or “heavily polluted” categories. After the establishment of the sewerage, significant changes were observed. In 2017, the number of wells in category 5 indicating the most contaminated samples decreased significantly for all three indices, while the number of samples in categories “good” and “acceptable” increased. Discriminant analysis was performed to determine if pre- and post-sewerage samples could be separated. A total of 75.6% of the cross-validated values were successfully categorized into the appropriate category, which indicates a significant difference between pre- and post-sewerage. Based on point and interpolated maps, it was established that in 2013, all three indices showed the highest pollution in the inner and southern parts of the settlement, while the northern areas of the settlement were less polluted. Based on the indices, it was determined that the process of groundwater purification in the settlement has started, although it will continue for years to come.
    Print ISSN: 0049-6979
    Electronic ISSN: 1573-2932
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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