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Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1960

Infrared absorptions of borazole derivatives

Haruyuki Watanabe; Masayuki Narisada; Toshio Nakagawa; Masaji Kubo

Abstract The distribution of potential energy among various internal co-ordinates was calculated for each normal mode of vibration of a borazole molecule as well as of a B-trichloroborazole molecule. Based on these calculations, the assignments of major infrared absorptions of B-trichloroborazole and B-trichloro-N-trimethylborazole to fundamentals were carried out, and the presence of a borazole ring was confirmed in the molecules of some newly synthesized borazole derivatives.


Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1960

Infra-red absorptions of N-trideuteroborazole and B-trichloro-N-trideuteroborazole

Haruyuki Watanabe; Tetsushi Totani; Toshio Nakagawa; Masaji Kubo

Abstract The infra-red absorption spectra of N-trideuteroborazole and B-trichloro-N-trideuteroborazole have been recorded across the rock-salt and potassium bromide regions and an assignment of major absorption peaks has been made. Comparison between the frequencies of fundamentals of borazole and N-trideuteroborazole has shown that revisions must be made for a few assignments hitherto accepted.


The Journal of the Society of Chemical Industry, Japan | 1957

Equilibrium Diagram of Quaternary System HBO 2 -NaF-H 2 O at 30°C.

Toshio Nakagawa; Haruyuki Watanabe

フッ化ホウ素の工業的な製造法として知られているSwinehart法は, 中間生成物としてナトリウムフルオキシボラックスNa2O (BF3)4を結晶としてとり出すのが特長である。著者らはこの中間生成物の結晶に疑問を抱き, 若干の予備実験から, ホウ酸とホウフッ化ナトリウムNaBF4の混合物であろうと推定した。これを確かめるために30℃におけるホウ酸- フッ化ナトリウム互変系水溶液の平衡状態図を作製し, これによって検討した。その結果前記推定の正しいことが結論された。またこの図によって, 他の二, 三の製造法にも検討を加え, いわゆるBooth法が最も有利な方法であると推論した。本邦における塚本らの研究も原理的にはBooth法と同一であること, およびその中の説明にある誤りを指摘した。さらにI.G.Ryssらの行ったNaF-H3BO3-H2O系の平衡の研究にも言及し,その中に述べられているフッ化ナトリウム, ホウ酸の混合溶液における異常な溶解度の増大という現象も何ら異とするにたりないことを示した。


Inorganic Chemistry | 1968

KINETICS AND MECHANISMS OF HYDROLYSIS OF BORAZINE DERIVATIVES IN AQUEOUS DIOXANE.

Tamotsu Yoshizaki; Haruyuki Watanabe; Toshio Nakagawa


Bulletin of the Chemical Society of Japan | 1962

Proton Magnetic Resonance of Ammonia-Borane Derivatives

Osamu Ohashi; Yukio Kurita; Tetsushi Totani; Haruyuki Watanabe; Toshio Nakagawa; Masaji Kubo


Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan | 1959

Infrared Absorption Spectra of Aromatic Ether Compounds. I: Characteristic Absorption Bands of Diphenyl Ether Derivatives@@@Diphenyl Ether誘導体の特有吸収帯

Masayuki Narisada; Toshio Nakagawa


Inorganic Chemistry | 1965

Reduction of B-Triethynylborazine Derivatives

Tamotsu Yoshizaki; Haruyuki Watanabe; Koichiro Nagasawa; Tetsushi Totani; Toshio Nakagawa


Inorganic Chemistry | 1968

Hydrolysis of tris(N-dibutylboryl-4-methyl-2-pyridylamino)borane

Tamotsu Yoshizaki; Haruyuki Watanabe; Toshio Nakagawa


Inorganic Chemistry | 1968

BUTANOLYSIS OF B-TRIS(PHENYLETHYNYL)BORAZINE IN 1-BUTANOL--DIOXANE MIXED SOLVENT.

Tamotsu Yoshizaki; Haruyuki Watanabe; Toshio Nakagawa


Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan | 1961

Synthesis of Water-soluble Derivatives of Sparingly-soluble Medicinal Compounds. II: Derivatives of Quaternary Ammonium Type@@@四級アンモニウム塩型誘導体

Yoshio Mori; Toshio Nakagawa

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Yukio Kurita

Yokohama National University

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