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  1. Article ; Online: Special Issue: Flow/Microwave Chemistry.

    Sajiki, Hironao

    Chemical record (New York, N.Y.)

    2018  Volume 19, Issue 1, Page(s) 2

    Language English
    Publishing date 2018-12-13
    Publishing country United States
    Document type Editorial
    ZDB-ID 2044646-9
    ISSN 1528-0691 ; 1527-8999
    ISSN (online) 1528-0691
    ISSN 1527-8999
    DOI 10.1002/tcr.201800187
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Aryl Boronic Esters Are Stable on Silica Gel and Reactive under Suzuki-Miyaura Coupling Conditions.

    Oka, Naoki / Yamada, Tsuyoshi / Sajiki, Hironao / Akai, Shuji / Ikawa, Takashi

    Organic letters

    2022  Volume 24, Issue 19, Page(s) 3510–3514

    Abstract: A wide range of aryl boronic 1,1,2,2-tetraethylethylene glycol esters [ArB(Epin)s] were readily synthesized. Purifying aryl boronic esters by conventional silica gel chromatography is generally challenging; however, these introduced derivatives are ... ...

    Abstract A wide range of aryl boronic 1,1,2,2-tetraethylethylene glycol esters [ArB(Epin)s] were readily synthesized. Purifying aryl boronic esters by conventional silica gel chromatography is generally challenging; however, these introduced derivatives are easily purified on silica gel and isolated in excellent yields. We subjected the purified ArB(Epin) to Suzuki-Miyaura couplings, which provided higher yields of the desired biaryl products than those obtained using the corresponding aryl boronic acids or pinacol esters.
    Language English
    Publishing date 2022-05-02
    Publishing country United States
    Document type Journal Article
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.2c01174
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Ruthenium-on-Carbon-Catalyzed Facile Solvent-Free Oxidation of Alcohols: Efficient Progress under Solid-Solid (Liquid)-Gas Conditions.

    Park, Kwihwan / Jiang, Jing / Yamada, Tsuyoshi / Sajiki, Hironao

    Chemical & pharmaceutical bulletin

    2021  Volume 69, Issue 12, Page(s) 1200–1205

    Abstract: A protocol for the ruthenium-on-carbon (Ru/C)-catalyzed solvent-free oxidation of alcohols, which proceeds efficiently under solid-solid (liquid)-gas conditions, was developed. Various primary and secondary alcohols were transformed to corresponding ... ...

    Abstract A protocol for the ruthenium-on-carbon (Ru/C)-catalyzed solvent-free oxidation of alcohols, which proceeds efficiently under solid-solid (liquid)-gas conditions, was developed. Various primary and secondary alcohols were transformed to corresponding aldehydes and ketones in moderate to excellent isolated yields by simply stirring in the presence of 10% Ru/C under air or oxygen conditions. The solvent-free oxidation reactions proceeded efficiently regardless of the solid or liquid state of the substrates and reagents and could be applied to gram-scale synthesis without loss of the reaction efficiency. Furthermore, the catalytic activity of Ru/C was maintained after five reuse cycles.
    MeSH term(s) Alcohols/chemistry ; Aldehydes/chemical synthesis ; Aldehydes/chemistry ; Carbon/chemistry ; Catalysis ; Ketones/chemical synthesis ; Ketones/chemistry ; Molecular Structure ; Oxidation-Reduction ; Ruthenium/chemistry
    Chemical Substances Alcohols ; Aldehydes ; Ketones ; Carbon (7440-44-0) ; Ruthenium (7UI0TKC3U5)
    Language English
    Publishing date 2021-12-01
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 213307-6
    ISSN 1347-5223 ; 0009-2363
    ISSN (online) 1347-5223
    ISSN 0009-2363
    DOI 10.1248/cpb.c21-00749
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 770: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: Development of deuterium labeling method based on the heterogeneous platinum group metal-catalyzed C-H activation.

    Sajiki, Hironao

    Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan

    2013  Volume 133, Issue 11, Page(s) 1177–1193

    Abstract: Deuterium (D) labeled compounds are utilized in various scientific fields such as mechanistic elucidation of reactions, preparation of new functional materials, tracers for microanalysis, deuterium labeled heavy drugs and so on. Although the H-D exchange ...

    Abstract Deuterium (D) labeled compounds are utilized in various scientific fields such as mechanistic elucidation of reactions, preparation of new functional materials, tracers for microanalysis, deuterium labeled heavy drugs and so on. Although the H-D exchange reaction is a straightforward method to produce deuterated organic compounds, many precedent methods require expensive deuterium gas and/or harsh reaction conditions. A part of our leading research agendas is intended to the development of novel and functional heterogeneous platinum-group catalysts and the reclamation of unknown functionalities of existing heterogeneous platinum-group catalysts. During the course of the study, benzylic positions of substrates were site-selectively deuterated under mild and palladium-on-carbon (Pd/C)-catalyzed hydrogenation conditions in heavy water (D2O). Heat conditions promoted the H-D exchange reactivity and facilitated the H-D exchange reaction at not only the benzylic sites but also inactive C-H bonds and heterocyclic nuclei. It is noteworthy that platinum-on-carbon (Pt/C) indicated a quite high affinity toward aromatic nuclei, and the H-D exchange reaction was strongly enhanced by the use of Pt/C as a catalyst under milder conditions. The mixed use of Pd/C and Pt/C was found to be more efficient in the H-D exchange reaction compared to the independent use of Pd/C or Pt/C. Furthermore, simple alkanes could also be efficiently deuterated under rhodium-on-carbon (Rh/C)-catalyzed conditions. The use of ruthenium-on-carbon (Ru/C) enabled the regiospecific and efficient deuterium incorporation at α-positions of alcohols and results were applied as a regio- and stereoselective multi-deuteration method of sugar derivatives.
    MeSH term(s) Carbohydrates/chemistry ; Carbon/chemistry ; Catalysis ; Deuterium/analysis ; Deuterium/chemistry ; Platinum/chemistry
    Chemical Substances Carbohydrates ; Platinum (49DFR088MY) ; Carbon (7440-44-0) ; Deuterium (AR09D82C7G)
    Language Japanese
    Publishing date 2013-10-24
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 200514-1
    ISSN 1347-5231 ; 0031-6903 ; 0372-7750 ; 0919-2085 ; 0919-2131
    ISSN (online) 1347-5231
    ISSN 0031-6903 ; 0372-7750 ; 0919-2085 ; 0919-2131
    DOI 10.1248/yakushi.13-00218
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 643: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article: Heavy water recycling for producing deuterium compounds

    Akutsu-Suyama, Kazuhiro / Sajiki, Hironao / Ueda, Misaki / Asamoto, Makiko / Tsutsumi, Yasuyuki

    RSC advances. 2022 Aug. 31, v. 12, no. 38

    2022  

    Abstract: Deuterium oxide (D₂O) is a special variety of water that serves as a crucial resource in a range of applications, but it is a costly and unusual resource. We therefore developed a new D₂O concentration system that combines a polymer electrolyte water ... ...

    Abstract Deuterium oxide (D₂O) is a special variety of water that serves as a crucial resource in a range of applications, but it is a costly and unusual resource. We therefore developed a new D₂O concentration system that combines a polymer electrolyte water electrolyzer and a catalytic combustor for recycling used D₂O. In this study, 1.6 L of used D₂O, with a concentration of 93.1%, was electrolyzed for 13.6 h to obtain 0.62 L of D₂O, with a concentration of 99.3%. In addition, the recombined water obtained by burning electrolytic gas using the catalytic combustor was also electrolyzed for 8.8 h to obtain 0.22 L of D₂O, with a concentration of 99.0%. The estimated separation factor of this electrolyzer at 25 °C was 3.6, which is very close to the equilibrium constant of the water/hydrogen isotope exchange reaction. Recycled D₂O was used as a deuterium source for the deuteration reaction of sodium octanoate, and 93.6% deuterated sodium octanoate was obtained. It is concluded that there were no impurities in the recycled D₂O that interfered with the deuteration reaction. These results can lead to the development of a cost-effective deuteration method for these materials.
    Keywords cost effectiveness ; deuterium ; deuterium oxide ; electrolytes ; isotopes ; octanoic acid ; polymers ; sodium
    Language English
    Dates of publication 2022-0831
    Size p. 24821-24829.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d2ra04369f
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Aryl Boronic Esters Are Stable on Silica Gel and Reactive under Suzuki–Miyaura Coupling Conditions

    Oka, Naoki / Yamada, Tsuyoshi / Sajiki, Hironao / Akai, Shuji / Ikawa, Takashi

    Organic letters. 2022 May 02, v. 24, no. 19

    2022  

    Abstract: A wide range of aryl boronic 1,1,2,2-tetraethylethylene glycol esters [ArB(Epin)s] were readily synthesized. Purifying aryl boronic esters by conventional silica gel chromatography is generally challenging; however, these introduced derivatives are ... ...

    Abstract A wide range of aryl boronic 1,1,2,2-tetraethylethylene glycol esters [ArB(Epin)s] were readily synthesized. Purifying aryl boronic esters by conventional silica gel chromatography is generally challenging; however, these introduced derivatives are easily purified on silica gel and isolated in excellent yields. We subjected the purified ArB(Epin) to Suzuki–Miyaura couplings, which provided higher yields of the desired biaryl products than those obtained using the corresponding aryl boronic acids or pinacol esters.
    Keywords Suzuki reaction ; boronic acids ; esters ; gel chromatography ; glycols ; silica gel
    Language English
    Dates of publication 2022-0502
    Size p. 3510-3514.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1523-7052
    DOI 10.1021/acs.orglett.2c01174
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Arylation of indoles using cyclohexanones dually-catalyzed by niobic acid and palladium-on-carbons.

    Ban, Kazuho / Yamamoto, Yuta / Sajiki, Hironao / Sawama, Yoshinari

    Organic & biomolecular chemistry

    2020  Volume 18, Issue 20, Page(s) 3898–3902

    Abstract: 3-Arylindoles were easily constructed from indoles and cyclohexanone derivatives using a combination of catalytic niobic acid-on-carbon ( ... ...

    Abstract 3-Arylindoles were easily constructed from indoles and cyclohexanone derivatives using a combination of catalytic niobic acid-on-carbon (Nb
    Language English
    Publishing date 2020-05-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2097583-1
    ISSN 1477-0539 ; 1477-0520
    ISSN (online) 1477-0539
    ISSN 1477-0520
    DOI 10.1039/d0ob00702a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Heavy water recycling for producing deuterium compounds.

    Akutsu-Suyama, Kazuhiro / Sajiki, Hironao / Ueda, Misaki / Asamoto, Makiko / Tsutsumi, Yasuyuki

    RSC advances

    2022  Volume 12, Issue 38, Page(s) 24821–24829

    Abstract: Deuterium oxide ( ... ...

    Abstract Deuterium oxide (D
    Language English
    Publishing date 2022-08-31
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d2ra04369f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Oxidative two-way regiocontrolled coupling of 3-methoxycarbonylcatechol and indoles to arylindoles.

    Sawama, Yoshinari / Kuwata, Shoko / Mae, Miyu / Udagawa, Taro / Akai, Shuji / Sajiki, Hironao

    Chemical communications (Cambridge, England)

    2022  Volume 58, Issue 93, Page(s) 12935–12938

    Abstract: 3-Methoxycarbonylcatechol effectively underwent two-way regiocontrolled coupling with ... ...

    Abstract 3-Methoxycarbonylcatechol effectively underwent two-way regiocontrolled coupling with indoles
    MeSH term(s) Indoles ; Oxidation-Reduction ; Oxidative Stress
    Chemical Substances Indoles
    Language English
    Publishing date 2022-11-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d2cc04843d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Syntheses of 25-Adamantyl-25-alkyl-2-methylidene-1α,25-dihydroxyvitamin D

    Maekawa, Kazuki / Ishizawa, Michiyasu / Ikawa, Takashi / Sajiki, Hironao / Matsumoto, Taro / Tokiwa, Hiroaki / Makishima, Makoto / Yamada, Sachiko

    Biomolecules

    2023  Volume 13, Issue 7

    Abstract: The active form of vitamin ... ...

    Abstract The active form of vitamin D
    MeSH term(s) Humans ; Vitamin D/pharmacology ; Cholecalciferol/pharmacology ; Gene Expression Regulation ; Cell Differentiation
    Chemical Substances 1,25-dihydroxyvitamin D (66772-14-3) ; Vitamin D (1406-16-2) ; Cholecalciferol (1C6V77QF41)
    Language English
    Publishing date 2023-07-06
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2701262-1
    ISSN 2218-273X ; 2218-273X
    ISSN (online) 2218-273X
    ISSN 2218-273X
    DOI 10.3390/biom13071082
    Database MEDical Literature Analysis and Retrieval System OnLINE

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