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7 results on '"Noriko, Watanabe"'

4. ChemInform Abstract: Lithium Potassium Borate and Lithium Rubidium Borate: New Non-linear Optical Crystals

Author

Noriko Watanabe, Michiko Nakaya, Sugawara Tamotsu, Ryuichi Komatsu, Tsuyoshi Kajitani, Yasuhiro Ono, and Hiroyuki Shiraishi

Subjects
Crystallography, chemistry, Potassium, chemistry.chemical_element, Lithium, General Medicine, Alkali metal, Boron, Spiral, Rubidium
Abstract

The title compounds, LiKB4O7 and LiRbB4O7, are newly developed non-linear optical crystals containing two kinds of anionic groups, namely (B3O8)7− and (B5O10)5−. The (B3O8)7− groups form infinite spiral chains parallel to the [100] direction, which are interconnected by sharing O atoms with (B5O10)5− groups.

Published
2001
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6. ChemInform Abstract: Titanium Tetrachloride-Mediated Diels-Alder Reactions of Cyclopentadiene with (-)-Dimenthyl Methylenemalonate and Its Acetoxy Derivative as New Chiral Dienophiles for Asymmetric Induction

Author

Nobuya Katagiri, Noriko Watanabe, Chikara Kaneko, E. Hayasaka, and Toru Haneda

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Cyclopentadiene, chemistry, Bicyclic molecule, Titanium tetrachloride, General Medicine, Bridged compounds, Malonic acid, Condensation reaction, Asymmetric induction, Medicinal chemistry, Derivative (chemistry)
Abstract

Esterification of malonic acid with (-)-menthol and subsequent condensation reaction with paraformaldehyde yield the dimenthyl methylenemalonate (II) which undergoes Diels-Alder reaction with cyclopentadiene (I) to give the bicyclo(2.2.1)heptenedicarboxylate (III) as the major isomer.

Published
1989
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