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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Attempt to Prepare N-(4-oxazolin-2-ylphenyl)barbituic acid
 Sika, Jan ; Kotoučová, Hana (advisor) ; Liška, František (referee)
Presented bachelor thesis is a part of broader topic of preparation and utilization of flavines and flavin salts in organo-catalysis. Primarily it deals with their utilization in the role of catalyst in enantioselective oxidations. Original purpose of this thesis was to prepare N-[4-(oxazolinu-2-yl)phenyl]barbituric acid 1. This experiment was supposed to prove a possibility of similarly substituted barbituric acids preparation and their further use in antropoizomer flavines and flavin salts synthesis. Although the original substance preparation proved to be unsuccessful the work results in the a successful preparation of one its intermediates N-[4-(oxazolin-2yl)phenyl]-methylcarbamate 25 which is a brand new substance and which was successfully characterized.
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Attempt to Prepare N-(4-oxazolin-2-ylphenyl)barbituic acid
 Sika, Jan ; Kotoučová, Hana (advisor) ; Liška, František (referee)
Presented bachelor thesis is a part of broader topic of preparation and utilization of flavines and flavin salts in organo-catalysis. Primarily it deals with their utilization in the role of catalyst in enantioselective oxidations. Original purpose of this thesis was to prepare N-[4-(oxazolinu-2-yl)phenyl]barbituric acid 1. This experiment was supposed to prove a possibility of similarly substituted barbituric acids preparation and their further use in antropoizomer flavines and flavin salts synthesis. Although the original substance preparation proved to be unsuccessful the work results in the a successful preparation of one its intermediates N-[4-(oxazolin-2yl)phenyl]-methylcarbamate 25 which is a brand new substance and which was successfully characterized.
Detailed record
Electrochemical determination of chlortoluron using carbon paste electrode
 Houšková, Lucie ; Zima, Jiří (advisor) ; Vyskočil, Vlastimil (referee)
Chlortoluron is a herbicide from the group of substituted ureas and it is used for weed control in production of cereals and poppy. Substituted ureas are widely used but these substances are known for their high mobility in soil, persistence and contamination of underground water. Therefore, the development of analytical methods suitable for residual concentrations determination is necessary. This thesis deals with the determination of chlortoluron using carbon paste electrode (CPE) by the methods of differential pulse voltammetry and high-performance liquid chromatography with electrochemical (HPLC-ED) and spectrophotometric (HPLC-UV) detection. The aim of the work was to find optimal conditions suitable for chlortoluron determination. Further, the possibility of using miniaturized carbon paste electrode (mCPE) and usability of tested methods for determination of chlortoluron in model samples of river water and soil were studied. Concentration dependences in deionized water were measured by the method of DPV in the Britton-Robinson (BR) buffer (pH = 3) and methanol (10 %, v/v). The limit of detection was 3,7∙10-7 mol∙dm-3 in the case of CPE and 8,7∙10-8 mol∙dm-3 in the case of mCPE. Also, concentration dependences were measured using HPLC with mobile phase containing BR buffer (pH = 4) and...
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