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Výsledky projektu Kovové katalyzátory deponované na funkčních křemičitých nosičích

Výsledky

▼▲Typ výsledku ▼▲Autor celku ▼▲Název celku
(Celkem 9 zázn.)
Semler, Misloslav; Štěpnička, Petr. Synthesis of aromatic ketones by Suzuki-Miyaura cross-coupling of acyl chlorides with boronic acids mediated by palladium catalysts deposited over donor-functionalized silica gel. Catalysis Today, 2015, sv. 243, s. 128–133. ISSN 0920-5861. IF 3.309. [Článek v časopise]
Abstract

Immobilized palladium catalysts prepared by deposition of palladium(II) acetate over silica gel functionalized with triple bond; length of mdashSi(CH2)3NHCH2Y donor groups (Y = SMe (1), NMe2 (2), PPh2 (3)) efficiently mediate cross-coupling of benzoyl chloride with benzeneboronic acid and its derivatives possessing electron-donating substituents. The presence of electron-withdrawing groups at the benzene ring decreases the yield of the coupling product while aliphatic acyl chlorides such as PhCH2CH2COCl and t-BuCOCl provide the coupling products in only poor yields. The course of the coupling reaction is very sensitive to the reaction conditions, the best results being achieved with potassium carbonate sesquihydrate as the base in dry toluene. The catalysts, which serve as the source of active metal, gradually loose their activity due to metal leaching and, mainly, decomposition of the solid support presumably by the action of the strong base present in the reaction system.
Semler M., Čejka J., Štěpnička P.. Synthesis and catalytic evaluation in the Heck reaction of deposited palladium catalysts immobilized via amide linkers and their molecular analogues. Catalysis Today, 2013, sv. in press, s. 0–0. ISSN 0920-5861. IF 2.980. [Článek v časopise]
doi: 10.1016/j.cattod.2013.09.012
Semler M., Čejka J., Štěpnička P.. A study into Stille cross-coupling reaction mediated by palladium catalysts deposited over siliceous supports bearing N-donor groups at the surface. Applied Organometal. Chem., 2013, sv. 27, s. 353–360. ISSN 0268-2605. IF 2.011. [Článek v časopise]
doi: 10.1002/zaac.201300389
Štěpnička P., Křečková P., Semler M., Čejka J.. Preparation and catalytic evaluation of a palladium catalyst deposited over two-dimensional zeolite ITQ-2 modified with N-donor groups. Z. Anorg. Allg. Chem., 2013, sv. in press, s. 0–0. ISSN 0044-2313. IF 1.163. [Článek v časopise]
doi: 10.1002/zaac.201300389
Semler, Miloslav; Čejka, Jiří; Štěpnička, Petr, Heterogeneous palladium catalyst for the reaction of aromatic acyl chlorides with boronic acids;16th Nordic Symposium on Catalysis, 15.-17.června 2014, Oslo, Norsko, Poster 93 [Jiný výsledek]
M. Semler, J. Čejka, P. Štěpnička, Deposited palladium catalysts immobilized via amide linkers and their molecular analogues: Synthesis, characterization and catalytic evaluation in Heck reaction; 5th Czech-Italian-Spanish Conference on Molecular Sieves and Catalysis 16. - 19. června 2013, Segovia, Španělsko, poster (č. P094) [Jiný výsledek]
Křečková, Pavlína, Palladiové katalyzátory deponované na nových silikátových materiálech. Diplomová práce, PřF UK Praha, Anorganická chemie, 2013 [Jiný výsledek]
Semler M., Křečková P., Čejka J., Štěpnička P., STILLE CROSS-COUPLING REACTION CATALYZED BY PALLADIUM CATALYSTS DEPOSITED ON VARIOUS SILICEOUS SUPPORTS MODIFIED WITH AMINE DONOR GROUPS: 44th Symposium on catalysis; 5.-6. listopadu 2012, Po 33. [Jiný výsledek]
Miloslav Semler, Jan Demel, Arnošt Zukal, Jiří Čejka, Petr Štěpnička, REDUKTIVNÍ DEHALOGENACE HALOGENOVANÝCH AROMÁTŮ POMOCÍ PALLADIOVÉHO KATALYZÁTORU DEPONOVANÉHO NA MOLEKULOVÉM SÍTU TYPU SBA-15 NESOUCÍM AMINOVÉ DONOROVÉ SKUPINY: 64. Sjezd českých a slovenských chemických společností; 25.-27. června 2012, Olomouc. 2P-07 [Jiný výsledek]