World's Best Scientists 2026 revealed!
Kazuhiko Takai

Kazuhiko Takai

D-Index & Metrics

Chemistry

D-Index
70
Citations
15667
World Ranking
5934
National Ranking
375

Kazuhiko Takai 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 Kazuhiko Takai 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: 293 publications — 61st percentile

61% of scientists in this discipline score the same or lower.

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

Kazuhiko Takai 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 Kazuhiko Takai 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: 70 D-Index — 68th percentile

68% of scientists in this discipline score the same or lower.

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

Overview

Kazuhiko Takai is affiliated with Okayama University in Japan and has contributed extensively to the fields of Materials Science and Chemistry. Their research spans several subfields, including Materials Chemistry, Organic Chemistry, Inorganic Chemistry, Industrial and Manufacturing Engineering, and Pharmaceutical Science.

The scientist's work focuses on key topics such as Crystallization and Solubility Studies, X-ray Diffraction in Crystallography, Coordination Chemistry and Organometallics, Synthetic Organic Chemistry Methods, Organometallic Complex Synthesis and Catalysis, Catalytic C-H Functionalization Methods, and Catalytic Cross-Coupling Reactions.

Takai has authored publications in multiple research venues, with a strong presence in The Cambridge Structural Database, where they have 25 publications. Other frequent publication venues include Chemical Communications with 3 papers, Organic Letters and Chemistry Letters each with 2 papers, and Chemical Science with 2 papers.

Their notable recent papers include:

  • Halogen-sodium exchange enables efficient access to organosodium compounds (2021, Communications Chemistry)
  • Molybdenum-Catalyzed Deoxygenative Cyclization of Carbonyl Compounds for the Synthesis of Pyrido[2,1-a]isoindoles (2021, Asian Journal of Organic Chemistry)
  • Molybdenum-Quinone-Catalyzed Deoxygenative Coupling of Aromatic Carbonyl Compounds (2022, Organic Letters)
  • Birch Reduction of Arenes Using Sodium Dispersion and DMI under Mild Conditions (2021, Chemistry Letters)
  • Cyclization of 1,n-Enynes Initiated by the Addition Reaction ofgem-Dichromiomethane Reagents to Alkynes (2020, Organic Letters)

Frequent collaborators in their research include Takashi Kurogi, Keiichi Irifune, Shunsuke Moritani, Sobi Asako, and Masahito Murai. Takashi Kurogi has coauthored 30 papers with Takai, while Keiichi Irifune and Shunsuke Moritani have contributed to 10 joint publications each. Sobi Asako and Masahito Murai have both collaborated on 7 papers alongside Takai.

Best Publications

  • Simple and selective method for aldehydes (RCHO) .fwdarw. (E)-haloalkenes (RCH:CHX) conversion by means of a haloform-chromous chloride system

    Kazuhiko Takai;Kenji Nitta;Kiitiro Utimoto

  • Reactions of alkenylchromium reagents prepared from alkenyl trifluoromethanesulfonates (triflates) with chromium(II) chloride under nickel catalysis.

    Kazuhiko Takai;Mizuka Tagashira;Tooru Kuroda;Koichiro Oshima

  • Selective grignard-type carbonyl addition of alkenyl halides mediated by chromium(II) chloride

    Kazuhiko Takai;Keizo Kimura;Tooru Kuroda;Tamejiro Hiyama

  • Insertion of polar and nonpolar unsaturated molecules into carbon-rhenium bonds generated by C-H bond activation: synthesis of phthalimidine and indene derivatives.

    Yoichiro Kuninobu;Yukimi Tokunaga;and Atsushi Kawata;Kazuhiko Takai

  • Rhenium-catalyzed formation of indene frameworks via C-H bond activation: [3+2] Annulation of aromatic aldimines and acetylenes

    Yoichiro Kuninobu;and Atsushi Kawata;Kazuhiko Takai

  • Organic Reactions Catalyzed by Rhenium Carbonyl Complexes

    Yoichiro Kuninobu;Kazuhiko Takai

  • A Novel Catalytic Effect of Lead on the Reduction of a Zinc Carbenoid with Zinc Metal Leading to a Geminal Dizinc Compound. Acceleration of the Wittig-Type Olefination with the RCHX2-TiCl4-Zn Systems by Addition of Lead

    Kazuhiko Takai;Tadahiro Kakiuchi;Yasutaka Kataoka;Kiitiro Utimoto

  • Manganese-catalyzed insertion of aldehydes into a C-H bond.

    Yoichiro Kuninobu;Yuta Nishina;Takahiro Takeuchi;Kazuhiko Takai

  • Rhodium-catalyzed asymmetric synthesis of spirosilabifluorene derivatives

    Yoichiro Kuninobu;Kanae Yamauchi;Naoya Tamura;Takayuki Seiki

  • Rhodium-Catalyzed Synthesis of Silafluorene Derivatives via Cleavage of Silicon−Hydrogen and Carbon−Hydrogen Bonds

    Tomonari Ureshino;Takuya Yoshida;Yoichiro Kuninobu;Kazuhiko Takai

  • (E)-Selective olefination of aldehydes by means of gem-dichromium reagents derived by reduction of gem-diiodoalkanes with chromium(II) chloride

    Takashi Okazoe;Kazuhiko Takai;Kiitiro Utimoto

  • Effective methods of carbonyl methylenation using CH2I2-Zn-Me3Al and CH2Br2-Zn-TiCl4 system

    Kazuhiko Takai;Yuji Hotta;Koichiro Oshima;Hitosi Nozaki

  • Carbonyl methylenation of easily enolizable ketones

    Jun ichi Hibino;Takashi Okazoe;Kazuhiko Takai;Hitosi Nozaki

  • Alkylidenation of Ester Carbonyl Groups by means of a Reagent Derived from RCHBr2, Zn, TiCl4, and TMEDA. Stereoselective Preparation of (Z)-Alkenyl Ethers

    Takashi Okazoe;Kazuhiko Takai;Koichiro Oshima;Kiitiro Utimoto

  • Palladium-catalyzed synthesis of dibenzophosphole oxides via intramolecular dehydrogenative cyclization.

    Yoichiro Kuninobu;Takuya Yoshida;Kazuhiko Takai

  • Wittig-type Reaction of Dimetallated Carbodianion Species as Produced by Zinc Reduction of gem-Polyhalogen Compounds in the Presence of Lewis Acids

    Kazuhiko Takai;Yuji Hotta;Koichiro Oshima;Hitosi Nozaki

  • Selective oxidation of a primary hydroxyl in the presence of secondary one

    Hiroki Tomioka;Kazuhiko Takai;Koichiro Oshima;Hitosi Nozaki

  • Rhenium- and Aniline-Catalyzed One-Pot Annulation of Aromatic Ketones and α,β-Unsaturated Esters Initiated by C ? H Bond Activation

    Yoichiro Kuninobu;Yuta Nishina;Makoto Shouho;Kazuhiko Takai

  • Indium‐Catalyzed Retro‐Claisen Condensation

    Atsushi Kawata;Kazumi Takata;Yoichiro Kuninobu;Kazuhiko Takai

  • Rhenium-catalyzed insertion of aldehyde into a C-H bond: synthesis of isobenzofuran derivatives.

    Yoichiro Kuninobu;Yuta Nishina;Chie Nakagawa;Kazuhiko Takai

  • Dramatic Rate Acceleration by a Diphenyl-2-pyridylphosphine Ligand in the Hydration of Nitriles Catalyzed by Ru(acac)2 Complexes

    Toshiyuki Oshiki;Hitoshi Yamashita;Kensuke Sawada;Masaru Utsunomiya

Frequent Co-Authors

Yoichiro Kuninobu
Yoichiro Kuninobu Kyushu University
Kiitiro Utimoto
Kiitiro Utimoto Kyoto University
Hitosi Nozaki
Hitosi Nozaki Okayama University
Koichiro Oshima
Koichiro Oshima Kyoto University
Seijiro Matsubara
Seijiro Matsubara Kyoto University
Terunori Fujita
Terunori Fujita Mitsui Chemicals (Japan)
Masahito Ochiai
Masahito Ochiai University of Tokushima
Kazushi Mashima
Kazushi Mashima Osaka University
Clayton H. Heathcock
Clayton H. Heathcock University of California, Berkeley
Tamejiro Hiyama
Tamejiro Hiyama Chuo University

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