IV.　ヒドロトリスピラゾリルボレート錯体（酸素錯体を含む）に関連する研究

2. Munetaka Akita, Keisuke Ohta, Yoshiaki Takahashi, Shiro Hikichi, and Yoshihiko Moro-oka
Synthesis and Structure Determination of Rh-diene Complexes with the Hydrotris(3,5-diisopropylpyrazolyl)borate Ligand, TpiPrRh(diene) (diene= cod, nbd): Dependence of the n(B-H) Values on the Hapticity of the TpiPr ligand (k2 vs. k3)
Organometallics 1997, 16, 4121 - 4128.

3. Shiro Hikichi, Tamako Ogihara, Kiyoshi Fujisawa, Nobumasa Kitajima, Munetaka Akita, and Yoshihiko Moro-oka
Synthesis and Characterization of the Benzoylformato Ferrous Complexes with the Hindered Trispyrazolylborate Ligand as a Structural Model for Mononuclear Non-Heme Iron Enzymes
Inorg. Chem. 1997, 36, 4539 - 4547.

4. Hidehito Komatsuzaki, Yuichi Nagasu, Kantaro Suzuki, Takao Shibasaki, Minoru Satoh, Fujio Ebina, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Dioxygen activation via a novel manganese(II) thiolate complex with hydrotris(3,5-diisopropylpyrazolyl)borate ligand
J. Chem. Soc., Dalton Trans. 1998, 511 - 512.

5. Yoshiaki Takahashi, Munetaka Akita, Shiro Hikichi, and Yoshihiko Moro-oka
Synthesis of Various Cationic Ruthenium-Aqua Complexes with the Hydrotris(3,5-diisopropylpyrazolyl)borate Ligand, TpiPrRu(OH2)n(L)3-n(CF3SO3)(THF)x, and Their Structures Supported by Hydrogen-Bonding Networks
Inorg. Chem. 1998, 37, 3186 - 3194.

6. Munetaka Akita, Nobuhiko Shirasawa, Shiro Hikichi and Yoshihiko Moro-oka
14e h1-Hydrocarbyliron complexes supported by hydrotris(3,5-diisopropylpyrazolyl)borate: The allyl complex prefers a highly coordinatively unsaturated 14e h1-structure to a 16e h3-structure
J. Chem. Soc., Chem. Commun. 1998, 973 - 974.

7. Munetaka Akita, Taichi Miyaji, Shiro Hikichi, and Yoshihiko Moro-oka
Systematic synthesis of a series of hydroperoxo-, alkylperoxo- and m-peroxopalladium complexes supported by the hydrotris(3,5-diisopropylpyrazolyl)borate ligand (TpiPr), TpiPrPd(py)-OOX [X= PdTpiPr(py), H. But], via dehydrative condensation of a hydroxo complex
J. Chem. Soc., Chem. Commun. 1998, 1005 - 1006.

8. Hidehito Komatsuzaki, Shinobu Ichikawa, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Characterization of a Dinuclear Mn(II) (m-Hydroxo)(m-pyrazolato) Complex and Hydrolytic Equilibrium of the Bridging Pyrazolate Ligand
Inorg. Chem. 1998, 37, 3652 - 3656.

9. Hidehito Komatsuzaki, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
The First Synthesis and Structural Characterization of Alkylperoxo Complex of Mn(II)
Inorg. Chem. 1998, 37, 6554 - 6555.

10. Tamako Ogihara, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Synthesis, Structural Characterization, and Extradiol Oxygenation of Iron-Catecholato Complexes with Hydrotris(pyrazolyl)borate Ligands
Inorg. Chem. 1998, 37, 2614 - 2615.

11. Shiro Hikichi, Hidehito Komatsuzaki, Munetaka Akita, and Yoshihiko Moro-oka
Aliphatic C-H Bond Oxygenation by the Co(II)-OOX Species with the Hindered Hydrotris(pyrazolyl)borate Ligands (X= Co(II), Alkyl, H)
J. Am. Chem. Soc. 1998, 120, 4699 - 4710.

12. Yoshiaki Takahashi, Munetaka Akita, Shiro Hikichi, and Yoshihiko Moro-oka
Two Isomeric Structures of Hydridoruthenium Complexes Supported by Hydrotrispyrazolylborates, TpRRu(H)(1.5-cyclooctadiene): An Octahedral Structure with Additional 3-center-2-electron Ru-H-B Interaction is More Stable Than a Square-pyramidal Structure with a k2-TpR Ligand
Organometallics 1998, 17, 4884 - 4888.

13. Shiro Hikichi, Michito Yoshizawa, Yasuyuki Sasakura, Munetaka Akita, and Yoshihiko Moro-oka
First Synthesis and Structural Characterizartion of Dinuclear M(III) bis(m-oxo) Complexes of nickel and Cobalt with Hydrotris(pyrazolyl)borate Ligand
J. Am. Chem. Soc. 1998, 120, 10567 - 10568.

14. Munetaka Akita, De-qiang Ma, Shiro Hikichi, and Yoshihiko Moro-oka
Synthesis and crystal structures of mononuclear half-sandwich Ni and Co complexes containing the Klaeui's tripodal ligand, [k3-(h5-C5H5)Co{P(=O)(OCH3)2}3]M(k2-NO3)(L) (M= Ni, Co)
J. Chem. Soc., Dalton Trans. 1999, 987 - 996.

15. Nobuhiko Shirasawa, Munetaka Akita, Shiro Hikichi, and Yoshihiko Moro-oka
Thermally stable coordinatively unsaturated alkyl complexes resistant to b-hydride elimination: TpiPrM-CH2CH3 (M= Co, Fe)
J. Chem. Soc., Chem. Commun. 1999, 417 - 418.

16. Keisuke Ohta, Mariko Hashimoto, Yoshiaki Takahashi, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Synthesis of a Series of Rhodium Complexes, TpiPrRhIL2 and TpiPrRhIII(X)(Y)(MeCN), with Hydrotris(3,5-diisopropyl-pyrazolyl)borato Ligand (TpiPr) from the Versatile Precursor, (k3-TpiPr)Rh(coe)(MeCN), and Dependence of the k2-k3 Interconversion Rate of the TpiPr Ligand on the Chelate Ring Size.
Organometallics 1999, 18, 3234 - 3240.　別刷(pdfファイル)

17. Masahiro Kosugi, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Inter- and Intramolecular Hydrogen-bonding Interaction of Hydroxo Groups and Steric Effect of Alkyl Substituents on Pyrazolyl Rings in TpR Ligands: Synthesis and Structural Characterization of Chloro-, Acetylacetonato- and Hydroxo Complexes of VO2+ with TpPri2 and TpMe2 Ligands
Inorg. Chem. 1999, 38, 2567-2578.　別刷 (pdfファイル)

18. Masahiro Kosugi, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
The first evidence for activation of exogenous O2 on a vanadium(IV) center: Synthesis and characterization of a peroxo vanadium(V) complex with hydrotris(3,5-diisopropyl-1-pyrazolyl)borate
J. Chem. Soc., Dalton Trans. 1999, 1369 - 1372.

19. Yoshiaki Takahashi, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
A Coordinatively Unsaturated Species with Agostic C-H Interaction, [(k4-TpiPr)Ru(dppe)]OSO2CF3, and its Addition Reaction
Organometallics 1999, 18, 2571 - 2573.　別刷 (pdfファイル)

20. Munetaka Akita, Taichi Miyaji, Shiro Hikichi, and Yoshihiko Moro-oka
A Transition Metal-Hydroperoxo Complex Stabilized by Hydrogen-Bonding Interaction: The First Example of a Hydroperoxopalladium Species Characterized by X-Ray Crystallography, (k2-TpiPr)Pd(PPh3)(OOH) [TpiPr= hydrotris(3,5-diisopropylpyrazolyl)borato]
Chem. Lett. 1999, 813 - 814.

21. Yoshiaki Takahashi, Mariko Hashimoto, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Conversion of Molecular Oxygen into a Hydroperoxo Species via Ring Opening Protonation of a Cyclic h2-Peroxide Intermediate: Characterization of the h2-Peroxide and Hydroperoxo Complexes Obtained by Oxygenation of a Rhodium(I) Complex, TpiPrRh(dppe) [TpiPr= hydrotris(3,5-di-iso-propylpyrazolyl)-borato], in the Presence of Pyrazoles
Angew. Chem. Int. Ed. in Engl. 1999, 38, 3074.

22. Yoshiaki Takahashi, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Oxidative C(sp3)-C(sp3) bond cleavage reaction of an isopropyl group to give an acetyl group via O2-treatment of a labile cationic ruthenium species, [TpiPrRu(dppene)(OH2)]+
J. Chem. Soc., Chem. Commun. 1999, 1491 - 1492.

23. Shiro Hikichi, Michito Yoshizawa, Yasuyuki Sasakura, Hidehito Komatsuzaki, Munetaka Akita, and Yoshihiko Moro-oka
Oxygenation of Saturated Hydrocarbyl Groups in the Dinuclear Ni(III) Bis(m-oxo) Complexes with the Hydrotris(pyrazolyl)borate Ligands TpR (R= Me3 and iPr2)
Chem. Lett. 1999, 979 - 980.

24. Shiro Hikichi, Michito Yoshizawa, Yasuyuki Sasakura, Munetaka Akita, and Yoshihiko Moro-oka
Characterization of reactive bis(m-oxo) dimetal(III) complexes with tris(pyrazolyl)borate ligands
J. Inorg. Biochem. 1999, 74, 31.

25. Tamako Ogihara, Shiro Hikichi, Munetaka Akita, Takeshi Uchida, Teizo Kitagawa, and Yoshihiko Moro-oka

An approach to the O2 activating mononuclear non-heme Fe enzymes: Structural characterization of Fe(II)-acetato complex and formation of alkylperoxoiron(III) species with the highly hindered hydrotris(3-tert-butyl-5-isopropyl-1-pyrazolyl)borate
Inorg. Chim. Acta 2000, 297, 162-170.

26. Koyu Fujita, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
Novel monoanionic tripodal ligands methylbis(1-methyl-2-imidazolyl)(1-pyrazolyl)borate (= [MeB(ImN-Me)2(PzR)]-): Synthesis and structural characterization of their nickel complexes and carboxylate shift from nickel to boron
J. Chem. Soc., Dalton Trans. 2000, 117 - 120.

27. De-qiang Ma, Shiro Hikichi, Munetaka Akita, and Yoshihiko Moro-oka
An entry to half-sandwich complexes of first row transition metals (Ni, Co, Mn) containing the Klaeui tripodal ligand, LOMe: Synthesis and crystal structures of oligomeric, [LOMeM(m-X)(L)]n (n= 2, 4), and monomeric complexes, LOMeM(L2)(X)
J. Chem. Soc., Dalton Trans. 2000, 1123-1134.

28. Munetaka Akita, Taichi Miyaji, Nobuyuki Muroga, Cordula Mock-Knoblauch, Shiro Hikichi, Waldemar Adam, and Yoshihiko Moro-oka
Synthesis and Dehydrative Condensation of Square-planar Mono- and Dinuclear Hydroxopalladium Complexes with the Hydrotris(3,5-diisopropylpyrazolyl)borato Ligand (TpiPr2), TpiPr2 (py)Pd-OH and (m-OH)2{PdTpiPr2(H2O)}2
Inorg. Chem. 2000, 39, 2096-2102.　別刷（pdfファイル）
29. Koyu Fujita, Shiro Hikichi, Munetaka Akita, Yoshihiko Moro-oka

Synthesis and structural characterization of a new class of organoborato ligands containing imidazolyl functional groups [MeB(ImN-Me)2(X)]-
J. Chem. Soc., Dalton Trans. 2000, 1255-1260.

30. Munetaka Akita, Mariko Hashimoto, Shiro Hikichi, and Yoshihiko Moro-oka
Synthesis and Structural Comparison of TpiPr2Rh[cis-1,2-bis(diphenylphosphino)ethene]: Factors Determining Hapticity (k2 vs. k3) of the TpiPr2 Ligand in TpiPr2Rh(diphosphine) Complexes
Oganometallics 2000, 19, 3744 - 3747.　別刷（pdfファイル）

31. Udai P. Singh, Rajender Singh, Shiro Hikichi, Munetaka Akita, and Yoshihiko. Moro-oka

Characterization of a dinuclear Mn(II) tri(m-carboxylato) complex with the hindered hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (= TpiPr2) ligand: intramolecular hydrogen bonding interaction between the protonated TpiPr2 and Mn-coordinating carboxylate ligands

Inorg. Chim. Acta, 2000, 310, 273 - 278.

32. Munetaka Akita, Yoshiaki Takahashi, Shiro Hikichi and Yoshihiko Moro-oka

Synthesis and Dehydrative Condensation of Monomeric Hydroxoruthenium Complexes with Hydrotris(3,5-diisopropylpyrazolyl)borate Ligand, TpiPr2Ru(L2)-OH (L2= dppe, bipy)

Inorg. Chem. 2001, 40, 169 - 172.　別刷（pdfファイル）

33. Nobuhiko Shirasawa, Trieu Thi Nguyet, Shiro Hikichi, Yoshihiko Moro-oka, and Munetaka Akita

Tetrahedral, Highly Coordinatively Unsaturated 14e(Fe) and 15e(Co) Hydrocarbyl Complexes Bearing Hydrotris(pyrazolyl)borato Ligands (TpR'), TpR'M-R (M= Fe, Co, Ni)

Organometallics 2001, 20, 3582-3598. 別刷（pdfファイル）

34. Masato Kujime, Shiro Hikichi and Munetaka Akita

C- and N/O-bound Enolatopalladium Complexes with Hydrotrispyrazolylborato Ligands (TpR: R= iPr2 and Me2) Obtained via Dehydrative Condensation Between the Hydroxo Complexes, TpRPd(py)-OH, and Active Methylene Compounds: Factors Determining the Isomer Distribution and Dimerization of Cyano Compounds
Organometallics 2001, 20, 4049 -4060. 別刷（pdfファイル）

35. Shiro Hikichi, Michito Yoshizawa, Yasuyuki Sasakura, Hidehito Komatsuzaki, Yoshihiko Moro-oka and Munetaka Akita

Structural Characterization and Intramolecular Aliphatic C-H Oxidation Ability of M(III)(m-O)2M(III) Complexes of Ni and Co with Hydrotris(3,5-diaklylpyrazolyl)borate Ligands TpMe2,X (X= Me, H, Br) and TpiPr2

Chemistry - A European Journal 2001, 7, 5011-5028..

36. Ken-ichiro Sugawara, Shiro Hikichi and Munetaka Akita

Dichloromethane Activation by Chlorochromium(II) Complexes with TpiPr2: Generation of an Electrophilic Cr-Methylene Species without the Action of an External Cl-Abstraction Reagent

Chem. Lett. 2001, 1094-1095.

37. Kazuhiro Uehara, Shiro Hikichi and Munetaka Akita

Rational Synthesis and Reversible Metal-metal Bond Scission of Heterobimetallic Xenophilic Complexes Containing an Unsupported, Polar Metal-metal Bond, TpiPr2M-Co(CO)3L (M= Ni, Co, Fe, Mn; L= CO, PPh3)

Organometallics 2001, 20, 5002-5004.　別刷（pdfファイル）

38. Shiro Hikichi, Yasuyuki Sasakura, Michito Yoshizawa, Yoshiko Ohzu, Yoshihiko Moro-oka, and Munetaka Akita
Selective Synthesis, Characterization, and Configurational Flexibility of the Coordinatively Unsaturated Metal Center of Half-sandwich Type Complexes with the Less-Hindered Hydrotris(3,5-dimethyl-4-X-1-pyrazolyl)borate Ligands [TpMe2,XMII(k2-O,O-L)] (M = Ni, Co; L = NO3, OAc; X = Me, H, Br)
Bull. Chem. Soc. Japan 2002, 75, 1255 - 1262.

39. Shin-ichi Yoshimitsu, Shiro Hikichi, and Munetaka Akita
Synthesis and Characterization of Coordinatively Unsaturated Alkynyl- and Aryl-cobalt Complexes with 15 Valence Electrons, TpiPr2Co-R, Bearing Hydrotris(3,5-diisopropylpyrazolyl)borato Ligand (TpiPr2).
Organometallics 2002, 21, 3762 - 3773.

40. Kazuhiro Uehara, Shiro Hikichi,�and Munetaka Akita

Highly Labile Cationic Tris-acetonitrile complexes, [TpRM(NCMe)3]OTf (M= Ni, Co; TpR: Hydrotrispyrazolylborato, R= Ph,Me and iPr2): Versatile Precursors for TpR-containing Nickel and Cobalt Complexes.

Dalton Trans. 2002, 3529 - 3538.

41. Taichi Miyaji, Masato Kujime, Shiro Hikichi, Yoshihiko Moro-oka, and Munetaka Akita
Synthesis and Characterization of a Series of Hydroperoxo-, Alkylperoxo- and m-Peroxo-palladium Complexes Containing Hydrotris(3,5-diisopropylpyrazolyl)borato Ligand (TpiPr2), (TpiPr2)(py)Pd-OO-X [X= H, t-Bu, Pd(TpiPr2)(py)] and (TpiPr2)(py)Pd-(m-k1:k2-OO)-PdTpiPr2.
Inorg. Chem. 2002, 41, 5286 - 5295.

42. Masato Kujime, Shiro Hikichi, and Munetaka Akita

Enolato-cobalt and -nickel Complexes Bearing TpiPr2 Ligand, [TpiPr2M(XCHY)]n [TpiPr2= Hydrotris(3,5-diisopropylpyrazolyl)borato; n= 1, 2], Obtained from Hydroxometal Complexes, (m-OH)2(MTpiPr2)2, and Active Methylene Compounds, CH2XY.

Inorg. Chim. Acta 2003, 350, 163. (Braunstein issue).

43. Kazuhiro Uehara, Shiro Hikichi,�and Munetaka Akita

Reactivity Control of a Dinuclear Xenophilic Species, Tp#Ni-RuCp(CO)2, via Spin Crossover across a Metal-metal Bond [Tp#: Hydrotris(3,5-dimethyl-4-bromopyrazolyl)borato]
Chem. Lett. 2002, 1198 - 1199.

44. Ken-ichiro Sugawara, Shiro Hikichi, and Munetaka Akita
Di- and Trivalent Chlorochromium Complexes Bearing Hydrotris(3,5-diisopropylpyrazolyl)borato Ligand (TpiPr2), TpiPr2CrCln(L) (n= 1,2) and [TpiPr2Cr(m-Cl)]2: Flexible Coordination Behavior of the TpiPr2 Ligand and Reduction Features of Cr(II) Species.
Dalton Trans. 2002, 4514 - 4524.

45. Masato Kujime, Shiro Hikichi and Munetaka Akita

Conversion of a Hydroperoxo Complex, (TpiPr2)(py)Pd-OOH,
into a Cyclic Alkylperoxo Complex Catalyzed by Cu(II) Species [TpiPr2: Hydrotris(3,5-diisopropylpyrazolyl)borato]
Chem. Lett., 2003, 32, 486 - 487.
46. Masato Kujime, Shiro Hikichi and Munetaka Akita
Interaction of Hydroperoxopalladium Complexes, (TpR)(py)Pd-OOH, with Hydroxonickel and -cobalt Complexes, [(m-OH)(MTpRﾕ)]2 (M= Ni, Co), Leading to Oxidative Dehydrogenation of the Saturated Hydrocarbyl Moiety in the Ancillary Ligand (TpiPr2).
Dalton Trans, 2003, 3506 - 3515.

47. Yoshiaki Takahashi, Shiro Hikichi, Yoshihiko Moro-oka and Munetaka Akita

Oxygenation of a Series of Cationic Aquoruthenium Complexes, TpiPr2Ru(OH2)nL3-nCF3SO3�(THF)x, Leading to Mono- and Dinuclear Aquo-hydroxo Complexes Supported by Unique Hydrogen Bonding Networks

Polyhedron, 2003, 23, 225 - 234. (ACS Tp symposium special issue)

48. Ken-ichiro Sugawara, Shiro Hikichi, and Munetaka Akita
A Peroxochromium Complex, TpiPr2Cr(O2)2, Obtained by Oxidative Dehydrative Condensation Between a Dihydroxochromium Complex and H2O2 [TpiPr2= hydrotris(3,5-diisopropylpyrazolyl)borato].
Dalton Trans. 2003, in press.　

49. Yoshiaki Takahashi, Mariko Hashimoto, Shiro Hikichi, Yoshihiko Moro-oka, and Munetaka Akita

Oxygenation of a Low Valent Rhodium Complex, TpiPr2Rh(dppe): Sequential Conversion of Molecular Oxygen into Peroxo and Hydroperoxo Complexes and Characterization of the Peroxo Species.
Inorg. Chim. Acta, 2004, 357, 1711 - 1724. (Prof. Hemut Werner special issue)

50. Kazuhiro Uehara, Shiro Hikichi, Akiko Inagaki, and Munetaka Akita
Xenophilic Complexes Bearing a TpR Ligand, TpRM-MﾕLn [TpR= TpiPr2, Tp# (TpMe2,4-Br); M= Ni, Co, Fe, Mn; MﾕLn= Co(CO)4, Co(CO)3(PPh3), RuCp(CO)2]: The Two Metal Centers are Held Together not by Covalent Interaction but by Electrostatic Attraction.
Chem. A Eur. J., 2005, 11, 2788 - 2809.

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