Národní úložiště šedé literatury Nalezeno 6 záznamů.  Hledání trvalo 0.01 vteřin. 
Carbon-Carbon Couplings between Chemically Equivalent or almost Equivalent Nuclei.
Blechta, Vratislav ; Strašák, Tomáš ; Sýkora, Jan
We present here a modification of the above experiment with the aim of increasing the sensitivity. This can be achieved by 2D J-resolved refocused INADEQUATE without decoupling during preparation period but with decoupling during acquisition and equilibrium periods. The experiment is discussed with respect to the sensitivity and influence of strong couplings.
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Photochemical Synthesis of Aza-aromatic Compounds.
Kos, Martin ; Žádný, Jaroslav ; Storch, Jan ; Sýkora, Jan ; Církva, Vladimír
Herein we report synthesis of series of novel both aza- and diaza-helicenes, and phenacenes, which were prepared mainly by photocyclization of corresponding imine precursors. Reaction conditions of photocyclization (i.e. solvent, photocatalyst, type of irradiation, use of water scavenger) were optimized and enhanced. Usage of TEMPO as oxidizing agent leads to improvement of yields up to 72 %. Prepared 2-pyridyl substituted azaphenacenes will be utilized for preparation of potential semiconductive layers in cooperation with IMC of the CAS.
Plný tet: SKMBT_C22017111612580 - Stáhnout plný textPDF
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Measurement of Carbon-Carbon Coupling between Chemically Equivalent Nuclei.
Blechta, Vratislav ; Strašák, Tomáš ; Sýkora, Jan
We present here a modification of the above experiment with aim of increasing the sensivity. The experiment is discussed with respect to the sensivity and influence of strong couplings.
Plný tet: SKMBT_22317011109290 - Stáhnout plný textPDF
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Photochemical Synthesis of Aryl-azahelicenes.
Kos, Martin ; Církva, Vladimír ; Sýkora, Jan ; Storch, Jan
Plný tet: SKMBT_22316112114171 - Stáhnout plný textPDF
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Molecular Dynamics in Selected Polycyclic Aromatic Compounds Monitored by Measurement of Selected Structural Parameters
Sýkora, Jan ; Strašák, Tomáš ; Blechta, Vratislav ; Dračínský, Martin ; Císařová, I.
The polycyclic aromatic compounds attract scientific attention namely due to their conjugated π-π aromatic systems which promise many interesting and unusual optical and electronic properties. Some of these compounds were shown to be effective in the development of materials useful e.g. in molecular-based electronics.
Plný tet: SKMBT_C22015080508250 - Stáhnout plný textPDF
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