PREPARATION OF SYNERGETIC HYPERVALENT ELEMENT COMPOUNDS BASED ON THE CONTROL OF COORDINATION SPHERE

2008 Fiscal Year Self-evaluation Report

• Project/Area Number: 18064013
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Hiroshima University
• Principal Investigator: YAMAMOTO Yohsuke Hiroshima University, 大学院理学研究科, 教授 (50158317)
• Project Period (FY): 2006 – 2009
• Keywords: 超原子価 / 5配位 / アンチモン / 5配位 / turnstile rotation / 理論計算

Research Abstract

5配位15族元素化合物は一般的に三方両錐構造であり二種類の異なる結合種(アピカル結合, エクアトリアル結合)を同一分子内に有するため, 同一の配位子を有していても配位子の結合位置の異なる位置異性体が存在する。これら位置異性体間の性質の解明は, 配位子位置の速い分子内交換反応の存在のため容易ではない。現在, 5配位三方両錐構造化合物の異性化機構はBerrypseudorotation(BPR)とturnstile rotation(TR)という二種類の機構が提唱されている。一般的には異性化はBPRで起こるとされ, TRの存在を現実に証明した例はこれまで無かった。本研究では, 新規三座配位子およびその配位子を有する5配位アンチモン化合物の合成, 構造決定, および異性体間の異性化反応について研究することを計画した。

Research Products

• [Journal Article] Pentacoordinate Organoantimony Compounds That Isomerize by Turstile Rotation (2009)
  • Author(s): Shiro Matsukawa, Hideaki Yamamichi, Yohsuke Yamamoto, and Kaori Ando
  • Journal Title: J. Am. Chem. Soc 131(10) Pages: 3418-3419
  • Peer Reviewed
• [Journal Article] Synthesis, Structure, and Isomerization of Arylphosphoranes with Anti-apicophilic Bonding Modes Using a Novel Bidentate Ligand with Two C2F5 Groups (2008)
  • Author(s): Xin-Dong Jiang, Shiro Matsukawa, and Yohsuke Yamamoto
  • Journal Title: Dalton Trans 28 Pages: 3678-3687
  • Peer Reviewed
• [Journal Article] Synthesis and Structure of a Hexacoordinate Carbon Copound (2008)
  • Author(s): Torahiko Yamaguchi, Yohsuke Yammoto, Daisuke Kinoshita, Kin-ya Akiba, Yun Zhang, Christopher A. Reed, Daisuke Hashizume, and Fujiko Iwasaki
  • Journal Title: J. Am. Chem. Soc 130(22) Pages: 6894-6895
  • Peer Reviewed
• [Journal Article] Stereomutation and Experimental Determination of the Relative Stability of Dastereomeric O-equatorial Anti-Apicophilic Spirophosphoranes (2008)
  • Author(s): Xin-Dong Jiang, Shiro Matsukawa, Hideaki Yamamichi, Ken-ichiro Kkuda, Satoshi Kojima, and Yohsuke Yamamoto
  • Journal Title: Eur. J. Org. Chem No.8 Pages: 1392-1405
  • Peer Reviewed
• [Journal Article] Syntheses, Crystal and Solution Structures, Ligand Exchange, and Ligand Coupling Reactions of Mixed Pentaarylantmony Compounds (2007)
  • Author(s): Guenter Schroeder, Takaaki Okinaka, Yasuyuki Mimura, Mitsuko Watanabe, Takayuki Matsuzaki, Atsushi Hasuoka, Yohsuke Yamamoto, Shiro Matsukawa, and Kin-ya Akiba
  • Journal Title: Chem. Eur. J 13(9) Pages: 2517-2529
  • Peer Reviewed
• [Presentation] Synthesis of Hypervalent Pentacoordinate and Hexacoordinate Carbon (2007)
  • Author(s): 山本陽介
  • Organizer: 8th International Coference on Heteroatom Chemistry Compounds
  • Place of Presentation: CA, U.S.A
  • Year and Date: 2007-08-13
• [Remarks]
  • URL: http://home.hiroshima-u.ac.jp/hetero/