Zobrazeno 1 - 10 of 231 pro vyhledávání: '"Karel Mach"'
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Akademický článek
Crandallite-rich beds of the Libkovice Member, Most Basin, Czech Republic: climatic extremes or paleogeographic changes at the onset of the Miocene Climatic Optimum?
Autor: Karel Mach, Vladislav Rapprich, Martin Faměra, Martina Havelcová, Tomáš Matys Grygar, Tomáš Novotný, Michal Řehoř, Yulia V. Erban Kochergina
Publikováno v: Geologica Acta, Vol 19, Iss 11, Pp 1-29 (2021)
We describe the occurrence and possible origin of rare beds 1–10cm thick and containing 20–70% of crandallite, a Ca-Al phosphate enriched in Sr and Ba, found within otherwise monotonous clay-rich lacustrine sediments of the Most Basin in the Cent
Externí odkaz: https://doaj.org/article/8a9d014fb81e4d2e8b60d6d1c43caba3
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Reactions of permethyltitanocene tucked-in derivatives with carbon dioxide
Autor: Jiří Pinkas, Róbert Gyepes, Miroslav Polášek, Karel Mach, Michal Horáček
Publikováno v: Dalton Transactions. 51:10198-10215
Single and double tucked-in titanocenes react with excess CO2 by insertion into their Ti–CH2 bonds to form carboxylate-tethered species and subsequently new dimeric carbodiolates.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86fa54778379576c9d777e5feb64207d
https://doi.org/10.1039/d2dt01344d
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Low-valent ansa-dimethylsilylene-, dimethylmethylene-bis(cyclopentadienyl) titanium compounds and ansa-titanium–magnesium complexes
Autor: Jiří Kubišta, Vojtech Varga, Karel Mach, Jiří Pinkas, Michal Horáček, Róbert Gyepes
Publikováno v: Journal of Organometallic Chemistry. 889:15-26
Reduction of ansa-titanocene dichlorides [X(η5-C5H4)2TiCl2] (X = SiMe2 (1) and CMe2 (2)) in tetrahydrofuran (THF) by preactivated magnesium in the presence of bis(trimethylsilyl)acetylene (BTMSA) yielded complexes [X(η5-C5H4)2Ti(η2-BTMSA)] (X = Si
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68988b5f10653dba7bdfded6de29fda2
https://doi.org/10.1016/j.jorganchem.2019.03.003
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Crandallite-rich beds of the Libkovice Member, Most Basin, Czech Republic: climatic extremes or paleogeographic changes at the onset of the Miocene Climatic Optimum?
Autor: Martina Havelcová, Martin Faměra, Michal Řehoř, Vladislav Rapprich, Tomáš Novotný, Yulia Erban Kochergina, Karel Mach, Tomáš Matys Grygar
Publikováno v: Geologica Acta; Vol. 19 (2021); 1-29, I-X
RCUB. Revistas Científicas de la Universidad de Barcelona
Universitat Jaume I
Dipòsit Digital de Documents de la UAB
Universitat Autònoma de Barcelona
We describe the occurrence and possible origin of rare beds 1–10cm thick and containing 20–70% of crandallite, a Ca-Al phosphate enriched in Sr and Ba, found within otherwise monotonous clay-rich lacustrine sediments of the Most Basin in the Cent
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19e9b4fa9f17dc7660edaf39ef0c4767
https://revistes.ub.edu/index.php/GEOACTA/article/view/32206
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9
Duxite – Fossil resin of Miocene age
Autor: Karel Mach, Vladimír Machovič, Martina Havelcová, Alexandra Špaldoňová, Ladislav Lapčák, Zdeněk Dvořák, Ivana Sýkorová
Publikováno v: Organic Geochemistry. 124:190-204
A series of Miocene fossil resin from the northwest part of the Czech Republic, called duxite, has been analyzed by elemental, microscopic, gas chromatography (GC/MS), pyrolysis-gas chromatography, Fourier Transform infrared (FTIR), and Raman techniq
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::163537d7fe0abc70445a34ef65ae4fd9
https://doi.org/10.1016/j.orggeochem.2018.07.014
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10
Insertion of 1-t-butylpropyne into singly tucked-in permethyltitanocene. Synthesis, crystal structure of product and transition-state geometry
Autor: Karel Mach, Katarína Szarka, Jiří Kubišta, Róbert Gyepes, Michal Horáček, Jiří Pinkas
Publikováno v: Journal of Molecular Structure. 1167:180-186
The singly tucked-in titanocene [(η5-C5Me5)TiIII{η5:η1-C5Me4(CH2)}] (1) reacted with one equivalent of 1-tert-butylpropyne to yield the propenyl-tethered regioisomer [(η5-C5Me5)Ti(η5:η1-C5Me4CH2C(t-Bu) = κCMe)] (3). The exclusive formation of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9b7be1a01f21282c8e17ffa78e28d04c
https://doi.org/10.1016/j.molstruc.2018.04.071
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