World's Best Scientists 2026 revealed!
Takeshi Ohkuma

Takeshi Ohkuma

D-Index & Metrics

Chemistry

D-Index
57
Citations
18424
World Ranking
10918
National Ranking
799

Takeshi Ohkuma publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Takeshi Ohkuma sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 265 publications — 54th percentile

54% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Takeshi Ohkuma D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Takeshi Ohkuma sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 57 D-Index — 39th percentile

39% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Overview

Takeshi Ohkuma is a researcher affiliated with Hokkaido University in Japan, specializing in the field of chemistry with a strong focus on organic chemistry. Their scientific work spans multiple subfields including inorganic chemistry, biomedical engineering, materials chemistry, and molecular biology.

Their research topics primarily cover:

  • Asymmetric Hydrogenation and Catalysis
  • Synthetic Organic Chemistry Methods
  • Catalytic C-H Functionalization Methods
  • Synthesis and Catalytic Reactions
  • Chemical Synthesis and Analysis
  • Catalytic Cross-Coupling Reactions
  • Catalysis for Biomass Conversion

Takeshi Ohkuma's recent publications illustrate ongoing work in synthesis and catalytic reactions. Selected papers include:

  • "Nucleophilic Isocyanation" (2020, ACS Omega)
  • "Asymmetric Hydrogenation of α-Amino Esters into Optically Active β-Amino Alcohols through Dynamic Kinetic Resolution Catalyzed by Ruthenabicyclic Complexes" (2023, Organic Letters)
  • "Photosensitized Intramolecular [2+2] Cycloaddition of 1H-Pyrrolo[2,3-b]pyridines Enabled by the Assistance of Lewis Acids" (2020, The Journal of Organic Chemistry)
  • "Ag2O-catalysed nucleophilic isocyanation: selective formation of less-stable benzylic isonitriles" (2020, Organic Chemistry Frontiers)
  • "Aerobic Allylic Amination Catalyzed by a Pd(OAc)2/P(OPh)3 System with Low Catalyst Loading" (2022, The Journal of Organic Chemistry)

Frequent collaborators in their research environment include:

  • Taiga Yurino
  • Noriyoshi Arai
  • Taichiro Touge
  • Kazuhiko Matsumura
  • Tomohiro Ishizaka

Publications have appeared most often in these venues:

  • Organic Letters
  • Journal of Synthetic Organic Chemistry Japan
  • The Journal of Organic Chemistry
  • Synlett
  • Catalysts

This publication record reflects a sustained output in prominent journals related to organic synthesis and catalytic methods. Takeshi Ohkuma's research contributes to advancing understanding and techniques within the chemical sciences, with a multi-disciplinary approach encompassing both synthetic chemistry and catalytic process development.

Best Publications

  • Asymmetric Catalysis by Architectural and Functional Molecular Engineering: Practical Chemo‐ and Stereoselective Hydrogenation of Ketones

    Ryoji Noyori;Takeshi Ohkuma

  • Asymmetric hydrogenation of .beta.-keto carboxylic esters. A practical, purely chemical access to .beta.-hydroxy esters in high enantiomeric purity

    Ryoji Noyori;Takeshi Ohkuma;Masato Kitamura;Hidemasa Takaya

  • PRACTICAL ENANTIOSELECTIVE HYDROGENATION OF AROMATIC KETONES

    Takeshi Ohkuma;Hirohito Ooka;Shohei Hashiguchi;Takao Ikariya

  • trans‐[RuCl2(phosphane)2(1,2‐diamine)] and Chiral trans‐[RuCl2(diphosphane)(1,2‐diamine)]: Shelf‐Stable Precatalysts for the Rapid, Productive, and Stereoselective Hydrogenation of Ketones

    Henri Doucet;Takeshi Ohkuma;Kunihiko Murata;Tohru Yokozawa

  • Mechanism of Asymmetric hydrogenation of ketones catalyzed by BINAP/1,2-diamine-ruthenium(II) complexes

    Christian A Sandoval;Takeshi Ohkuma;Kilian Muñiz;Ryoji Noyori

  • Homogeneous asymmetric hydrogenation of functionalized ketones

    Masato. Kitamura;Takeshi. Ohkuma;Shinichi. Inoue;Noboru. Sayo

  • Stereoselective hydrogenation via dynamic kinetic resolution

    R. Noyori;T. Ikeda;T. Ohkuma;M. Widhalm

  • Asymmetric Hydrogenation of Alkenyl, Cyclopropyl, and Aryl Ketones. RuCl2(xylbinap)(1,2-diamine) as a Precatalyst Exhibiting a Wide Scope

    Takeshi Ohkuma;Masatoshi Koizumi;Henri Doucet;Trang Pham

  • The Hydrogenation/Transfer Hydrogenation Network: Asymmetric Hydrogenation of Ketones with Chiral η6-Arene/N-Tosylethylenediamine−Ruthenium(II) Catalysts

    Takeshi Ohkuma;Noriyuki Utsumi;Kunihiko Tsutsumi;Kunihiko Murata

  • Preferential hydrogenation of aldehydes and ketones.

    Takeshi Ohkuma;Hirohito Ooka;Takao Ikariya;Ryoji Noyori

  • Asymmetrische Katalyse mit hinsichtlich Struktur und Funktion gezielt entworfenen Molekülen: die chemo‐ und stereoselektive Hydrierung von Ketonen

    Ryoji Noyori;Takeshi Ohkuma

  • trans-RuH(η1-BH4)(binap)(1,2-diamine): A Catalyst for Asymmetric Hydrogenation of Simple Ketones under Base-Free Conditions

    Takeshi Ohkuma;Masatoshi Koizumi;Kilian Muñiz;Gerhard Hilt

  • Toward efficient asymmetric hydrogenation: Architectural and functional engineering of chiral molecular catalysts

    Ryoji Noyori;Masato Kitamura;Takeshi Ohkuma

  • Asymmetric Hydrogenation of Amino Ketones Using Chiral RuCl2(diphophine)(1,2-diamine) Complexes

    Takeshi Ohkuma;Dai Ishii;and Hiroshi Takeno;Ryoji Noyori

  • Catalytic Asymmetric Cyanation Reactions

    Nobuhito Kurono;Takeshi Ohkuma

  • Asymmetric Hydrogenation of tert-Alkyl Ketones

    Takeshi Ohkuma;Christian A Sandoval;Rajagopal Srinivasan;Quinghong Lin

  • Conformationally Flexible Biphenyl‐phosphane Ligands for Ru‐Catalyzed Enantioselective Hydrogenation

    Koichi Mikami;Toshinobu Korenaga;Masahiro Terada;Takeshi Ohkuma

  • Asymmetric Hydrogenation

    Unknown

  • Asymmetric Activation of Racemic Ruthenium(II) Complexes for Enantioselective Hydrogenation

    Takeshi Ohkuma;Henri Doucet;Trang Pham;Koichi Mikami

  • Selective Hydrogenation of Benzophenones to Benzhydrols. Asymmetric Synthesis of Unsymmetrical Diarylmethanols

    Takeshi Ohkuma;Masatoshi Koizumi;Hideyuki Ikehira;Tohru Yokozawa

  • Asymmetric hydrogenation of alpha-chloro aromatic ketones catalyzed by eta6-arene/TsDPEN-ruthenium(II) complexes.

    Takeshi Ohkuma;Kunihiko Tsutsumi;Noriyuki Utsumi;Noriyoshi Arai

Frequent Co-Authors

Ryoji Noyori
Ryoji Noyori Nagoya University
Masato Kitamura
Masato Kitamura Nagoya University
Kilian Muñiz
Kilian Muñiz Institució Catalana de Recerca i Estudis Avançats
Henri Doucet
Henri Doucet University of Rennes
Koichi Mikami
Koichi Mikami Tokyo Institute of Technology
Hidemasa Takaya
Hidemasa Takaya Kyoto University
Makoto Tokunaga
Makoto Tokunaga Kyushu University
Keisuke Suzuki
Keisuke Suzuki University of Sussex
Masahiro Terada
Masahiro Terada Tohoku University
Hisanori Shinohara
Hisanori Shinohara Nagoya University

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