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Your search keyword '"Yasuhito Koyama"' showing total 6 results
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6 results on '"Yasuhito Koyama"'

2. ChemInform Abstract: 9,9-Diarylfluorene Moiety Incorporated into Polymer Main Chains: An Essential Skeleton Exhibiting Prominent Physical, Chemical, and Optical Properties

Author

Kazuko Nakazono, Yasuhito Koyama, Toshikazu Tataka, and Hideki Hayashi

Subjects
chemistry.chemical_classification, chemistry, Physical chemical, Polymer chemistry, Moiety, General Medicine, Polymer, Skeleton (category theory)
Abstract

The present review summarizes the prominent properties, in particular, the unique optical properties, generated by 9,9-diarylfluorene moiety introduced into polymer main chains in addition to the s...

Published
2010

3. ChemInform Abstract: Syntheses of the D-, E-, F-, and I-Ring Parts of Ciguatoxin by a Common Strategy Starting from Tri-O-acetyl-D-glucal

Author

Yuko Ohtaniuchi, Ken Shimawaki, Kenshu Fujiwara, Shin-ichiro Souma, Yasuhito Koyama, Akio Murai, Atsushi Takemura, and Eriko Doi

Subjects
chemistry.chemical_compound, Ciguatoxin, Olefin metathesis, Chemistry, Salt metathesis reaction, General Medicine, Ring (chemistry), Combinatorial chemistry, Glucal
Abstract

Chiral medium-sized monocyclic ethers corresponding to the D-, E-, F-, and I-ring parts of ciguatoxin have been synthesized from tri-O-acetyl-D-glucal through a common synthetic route involving ring-closing olefin metathesis.

Published
2010

4. ChemInform Abstract: Secure Route to the Epoxybicyclo[7.3.0]dodecadienediyne Core of the Kedarcidin Chromophore

Author

Masahiro Hirama, Yasuhito Koyama, Isao Ohashi, Itaru Sato, and Kouki Ogawa

Subjects
Core (optical fiber), chemistry.chemical_compound, Chemistry, Stereochemistry, Kedarcidin chromophore, Epoxide, General Medicine, Ring (chemistry)
Abstract

Formation of an epoxide before 9-membered ring cyclization and SmI2 mediated reductive olefination in the presence of the epoxide successfully produced the epoxybicyclo[7.3.0]dodecadienediyne core of the kedarcidinchromophore.

Published
2009

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