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18 results on '"Hayashi, Shin-ya"'

1. Planar Subporphyrin Borenium Cations

Author

Tsurumaki, Eiji, Hayashi, Shin-ya, Tham, Fook S, Reed, Christopher A, and Osuka, Atsuhiro

Subjects
Inorganic Chemistry, Chemical Sciences, General Chemistry, Chemical sciences, Engineering
Abstract

Subporphyrin borenium cations with a carborane counterion have been prepared by treatment of B-methoxy subporphyrins with the silylium reagent Et(3)Si(CH(6)B(11)Br(6)). In contrast to the distinctly domed subphthalocyanine borenium cation, a nearly planar structure with sp(2) hybridized boron is found in the X-ray structure of the triphenylsubporphyrin borenium cation. The cations exhibit absorption and fluorescence spectra that are quite similar to those of B-methoxy subporphyrins. B-phenyl subporphyrins were prepared in good yield by reaction of subporphyrin borenium cations with phenyllithium.

Published
2011

5. Subporphyrins with an Axial BC Bond

Author

Saga, Shun, primary, Hayashi, Shin‐ya, additional, Yoshida, Kouta, additional, Tsurumaki, Eiji, additional, Kim, Pyosang, additional, Sung, Young Mo, additional, Sung, Jooyoung, additional, Tanaka, Takayuki, additional, Kim, Dongho, additional, and Osuka, Atsuhiro, additional

Published
2013
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15. S2 Fluorescence Dynamics of meso-Aryl-Substituted Subporphyrins.

Author

Sung, Jooyoung, Kim, Pyosang, Saga, Shun, Hayashi, Shin ‐ ya, Osuka, Atsuhiro, and Kim, Dongho

Subjects
SULFUR, FLUORESCENCE spectroscopy, PORPHYRINS, CHEMICAL derivatives, PHOTON upconversion, TETRAPHENYLPORPHYRIN, FEMTOSECOND pulses
Abstract

S2 ‐ Fluoreszenz: Subporphyrine sind faszinierende Verbindungen, aber die Eigenschaften ihrer höherliegenden angeregten Zustände waren bislang nicht bekannt. Die S2 ‐ Fluoreszenz dieser Subporphyrine wurde jetzt untersucht; interne Umwandlung des S2 ‐ Zustandes in den S1 ‐ Zustand geschieht innerhalb von ungefähr 300 fs. Die zwei Übergangsdipolmomente der entarteten S2 ‐ Zustände liegen trotz der C3 ‐ Symmetrie des Subporphyrins orthogonal zueinander vor. [ABSTRACT FROM AUTHOR]

Published
2013
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18. Stereoselective synthesis of spirooxindoles by palladium-catalyzed decarboxylative cyclization of gamma-methylidene-delta-valerolactones with isatins.

Author

Shintani R, Hayashi SY, Murakami M, Takeda M, and Hayashi T

Subjects
Catalysis, Combinatorial Chemistry Techniques, Cyclization, Indoles chemistry, Molecular Structure, Spiro Compounds chemistry, Stereoisomerism, Indoles chemical synthesis, Isatin chemistry, Palladium chemistry, Pyrones chemistry, Spiro Compounds chemical synthesis
Abstract

A new synthetic method of spirooxindole derivatives has been developed by way of a palladium-catalyzed decarboxylative cyclization of gamma-methylidene-delta-valerolactones with isatins. By employing a newly prepared phosphoramidite ligand, the reaction proceeds smoothly with excellent diastereoselectivity. Preliminary results of its application to asymmetric catalysis using a chiral phosphoramidite ligand are also described.

Published
2009
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