Zobrazeno 1 - 10 of 26 pro vyhledávání: '"Jarosław Błaszczyk"'
1
Akademický článek
New Optically Active tert-Butylarylthiophosphinic Acids and Their Selenium Analogues as the Potential Synthons of Supramolecular Organometallic Complexes: Syntheses and Crystallographic Structure Determination
Autor: Jarosław Błaszczyk, Bogdan Bujnicki, Patrycja Pokora-Sobczak, Grażyna Mielniczak, Lesław Sieroń, Piotr Kiełbasiński, Józef Drabowicz
Publikováno v: Molecules, Vol 28, Iss 11, p 4298 (2023)
The aim of the research described in this publication is two-fold. The first is a detailed description of the synthesis of a series of compounds containing a stereogenic heteroatom, namely the optically active P-stereogenic derivatives of tert-butyla
Externí odkaz: https://doaj.org/article/e1aa0a88dce745d7876b0f43ffce7442
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3
Akademický článek
Diastereoisomerically Pure, (S)-O-1,2-O-isopropyli dene-(5-O-α-d-glucofuranosyl) t-butanesulfinate: Synthesis, Crystal Structure, Absolute Configuration and Reactivity
Autor: Bogdan Bujnicki, Jarosław Błaszczyk, Marek Chmielewski, Józef Drabowicz
Publikováno v: Molecules, Vol 25, Iss 15, p 3392 (2020)
The reaction of t-butylmagnesium chlorides with diastereomerically pure (R)-1,2-O-isopropylidene-3,5-O-sulfinyl-α-d-glucofuranose (R)-4 was found to be stopped at the stage of the corresponding, diastereoisomerically pure 1,2-O-isopropylidene-(5-O-
Externí odkaz: https://doaj.org/article/bc77845bc6014766b853d30bc458dddc
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4
Akademický článek
Quarter of a Century after: A Glimpse at the Conformation and Mechanism of Candida antarctica Lipase B
Autor: Jarosław Błaszczyk, Piotr Kiełbasiński
Publikováno v: Crystals, Vol 10, Iss 5, p 404 (2020)
Lipase B from Candida antarctica (CAL-B) belongs to the family of α/β-hydrolases, and is one from the most extensively used biocatalysts in the kinetic resolution of amines and alcohols in a racemic state, in the desymmetrization of diacetates or d
Externí odkaz: https://doaj.org/article/c1d6bf8b2cf64b60b5e77d7bb68b9095
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5
Akademický článek
Nucleophilic Substitution at Tetracoordinate Sulfur. Kinetics and Mechanism of the Chloride-Chloride Exchange Reaction in Arenesulfonyl Chlorides: Counterintuitive Acceleration of Substitution at Sulfonyl Sulfur by ortho-Alkyl Groups and Its Origin
Autor: Marian Mikołajczyk, Monika Gajl, Jarosław Błaszczyk, Marek Cypryk, Bartłomiej Gostyński
Publikováno v: Molecules, Vol 25, Iss 6, p 1428 (2020)
The chloride-chloride exchange reaction in arenesulfonyl chlorides was investigated experimentally and theoretically by density functional theory (DFT) calculations. The second order rate constants and activation parameters of this identity reaction
Externí odkaz: https://doaj.org/article/b941b7cd84b844ab8210bc16b19d84ba
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7
Absolute Configuration and Conformation of (-)
Autor: Ana G, Petrovic, Prasad L, Polavarapu, Andrzej, Łopusiński, Dorota, Krasowska, Wanda, Wieczorek, Małgorzata, Szyrej, Jarosław, Błaszczyk, Józef, Drabowicz
Publikováno v: The Journal of Organic Chemistry
The absolute configuration and conformations of (−)-tert-butylphenylphosphinoamidate were determined using three different chiroptical spectroscopic methods, namely vibrational circular dichroism (VCD), electronic circular dichroism (ECD), and opti
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::51b25ebc5041bc6cee359d370d59e0f2
https://pubmed.ncbi.nlm.nih.gov/32786637
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8
Handling of Selenomethionines in Macromolecular Refinement
Autor: Jarosław Błaszczyk
Publikováno v: Biochemistry & Analytical Biochemistry.
In the Protein Data Bank, we can find X-ray structures which were determined from selenium-derivatized proteins, but the deposited coordinates, to our surprise, contain native methionines. The problem is likely due to not complete substitution of nat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85d5dac99680ecafcb9f7d073f298595
https://doi.org/10.4172/2161-1009.1000155
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9
The synthesis, X-ray and solid state NMR studies of 2-N,N-diisopropylamino-1,3,2λ5- oxaselenaphospholane-2-selone
Autor: Marek J. Potrzebowski, Wojciech J. Stec, Michał W. Wieczorek, Konrad Misiura, Jarosław BŁaszczyk
Publikováno v: Journal of the Chemical Society, Perkin Transactions 2. :163-168
31 P and 77Se high resolution solid state NMR spectroscopy was employed to study structural properties of 2-N,N-diisopropylamino-1,3,2λ5- oxaselenaphospholane-2-selone 5 the compound made in the course of developing reagents for stereocontrolled syn
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::180b3c319fd14aa144ea8cb24070c0aa
https://doi.org/10.1039/a606593g
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10
CRYSTAL AND MOLECULAR STRUCTURE AND SOLID STATE NMR STUDIES OF BIS(5,5-DIMETHYL-2-OXO-1,3,2-DIOXAPHOSPHORINAN-2-YL) SELENIDE
Autor: Roman Dembinski, Aleksandra Skowrońska, Michał W. Wieczorek, Marek J. Potrzebowski, JarosŁAw Błaszczyk
Publikováno v: Phosphorus, Sulfur, and Silicon and the Related Elements. 102:15-24
The structural investigation of the phosphoroorganic selenium-containing title compound C10H20O6P2Se (1) was carried out. The structure of 1 has been determined by X-ray analysis and correlated with the solid state NMR studies, its purity and identit
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::be5e5a7cd77b0afd82104c5dce17d561
https://doi.org/10.1080/10426509508042537
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