Johannes Becka

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2,7-Diselenatricyclo[]deca-1,3-diene-4,5,9,10-tetraone, C8O4Se2, was prepared from 1,2-diselenosquarate and squaric acid dichloride. Its crystal structure and the structure of the already known sulfur analogue C8O4S2 were determined (C8O4S2: orthorhombic, Pca21, a = 1413.64(2), b = 599.850(9), c = 968.8(1) pm; C8O4Se2: orthorhombic, Pnnm, a =(More)
The dependence of ethylene production and respiration rate on the concentration of gibberellin (GA) applied in water emulsion of lanoline to young fruits was studied in Yellow transparent apples. Ethylene production and respiration rate were slightly increased by GA treatment. The increased level was maintained throughout the entire ripening period, which(More)
In the presence of [NBu4][PF6] as the electrolyte, thianthrene (TA) is transformed by electrochemical oxidation to thianthrenium hexafluorophosphate containing the TA•+ radical cation. The reactions were performed in CH2Cl2, H3CCN, and liquid SO2 as solvents. In CH2Cl2, TA[PF6] is sparingly soluble and is deposited directly in crystalline form on the(More)
Ethylene production and respiration rate of an early cultivar of apples, Letní průsvitné žluté, is significantly increased after the application of the lowest tested concentration of CCC (0.1% in lanolin). These effects, calculated from the amount of released ethylene and carbon dioxide, were observed during the whole period of ripening. The production of(More)
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