Výsledky vyhledávání - "Masaaki Takasuka"

Development of new xanthendiol derivatives applied to the negative-tone molecular resists for EB/EUVL

Autor: Takashi Sato, Masatoshi Echigo, Yumi Ochiai, Masako Yamakawa, Makinoshima Takashi, Yu Okada, Masaaki Takasuka

Publikováno v: SPIE Proceedings.

In this paper, we report the development of new xanthendiol derivatives applied to the negative-tone molecular resists for EB/EUVL. The new xanthendiol derivatives were easily synthesized by the condensation of aldehydes and dihydroxyaromatic compoun

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b47762c7364bc6c49f96971c19d7223a
https://doi.org/10.1117/12.2045654

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The Grunwald-Winstein relationship in the solvolysis of crowded tertiary alkyl chlorides. Hindered hydration and hydrophobic effect

Autor: Yasushi Ohga, Takuhiro Ushino, Masaaki Takasuka, Takao Okazaki, Ken'ichi Takeuchi, Tadasuke Endo, Hironobu Tokunaga, Kazuhiko Tokunaga, Tomomi Kinoshita, Eiji Shiba

Publikováno v: Journal of Physical Organic Chemistry. 14:229-238

Various highly crowded tertiary alkyl chlorides having a neopentyl or a (1-adamantyl)methyl substituent on the reaction center were subjected to solvolysis rate studies, and the Grunwald–Winstein (GW) type relationship with respect to the YCl scale

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d199ac5bfa93f1f12507b7daa0b2e6a6
https://doi.org/10.1002/poc.358

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Experimental and theoretical evaluation of energetics for nucleophilic solvent participation in the solvolysis of tertiary alkyl chlorides on the basis of gas phase bridgehead carbocation stabilities

Autor: Masaaki Takasuka, Eiji Shiba, Takao Okazaki, José-Luis M. Abboud, Tomomi Kinoshita, Rafael Notario, Ken'ichi Takeuchi, Obis Castaño

Publikováno v: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 122(30):7351-7357

The specific rates of solvolysis in 80% ethanol and 97% 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) for various tertiary alkyl chlorides having different steric requirement and experimental (FT ICR) gas-phase stabilities of the corresponding carbocation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::024fa3d1ca3786dd7e6b74c8b2d4f614
http://hdl.handle.net/2433/7659

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Solvolysis of 2-Aryl-2-chloro-4,4-dimethylpentanes. Confirmation of Validity of Brown−Okamoto σ+ Constants

Autor: Masaaki Takasuka, Ken'ichi Takeuchi, Takao Okazaki, Yasushi Ohga

Publikováno v: The Journal of Organic Chemistry. 64:2375-2380

Specific rate constants of solvolysis in 90% aqueous acetone have been determined at 25 °C for 10 2-aryl-2-chloro-4,4-dimethylpentanes (3) having a substituent p-cycPr, p-Me, m-Me, p-F, (H), p-Cl, m-Cl, m-CF3, p-CF3, or p-NO2. The Hammett−Brown re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe04202359b831b2fcaf38bc6f14a997
https://doi.org/10.1021/jo9821067

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Structural effects of the Grunwald–Winstein correlations in the solvolysis of some simple tertiary alkyl chlorides

Autor: Ken'ichi Takeuchi, Masaaki Takasuka, Takushiro Ushino, Yasushi Ohga

Publikováno v: Journal of Physical Organic Chemistry. 10:717-724

The rates of solvolysis in various solvents at 25 °C were determined for five tertiary alkyl chlorides: 2-chloro-2,4,4-trimethylpentane (4), 2-chloro-2,4-dimethylpentane, 2-chloro-2-methylpentane, 1-chloro-1,3,3-trimethylcyclopentane (7) and 1-chlor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d817867e93755f31508dacdcb807127f
https://doi.org/10.1002/(sici)1099-1395(199710)10:10<717::aid-poc941>3.0.co

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Metal cation-exchanged montmorillonite(Mn+-Mont)-catalysed carbonyl-ene reactions

Autor: Masaaki Takasuka, Jun-ichi Tateiwa, Sakae Uemura, Akihiro Kimura

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :2169-2174

Metal cation-exchanged montmorillonite (M n+ -mont) works in acetonitrile at 80 °C as a Lewis acid catalyst for the intermolecular carbonyl-ene reaction of α-methylstyrenes with paraformaldehyde to give the corresponding homoallylic alcohols, Zr 4+

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3eed8698a2e4753174880047b4ac1928
https://doi.org/10.1039/a702906c

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Investigation of correlation with the octanol water partition coefficient and the sensitivity of negative-tone molecular resists

Autor: Masako Yamakawa, Yu Okada, Masatoshi Echigo, Yumi Ochiai, Masaaki Takasuka

Publikováno v: SPIE Proceedings.

In this paper, we report the investigation of correlation with the octanol water partition coefficient and the sensitivity of negative-tone molecular resists based on calix[4]resorcinarene (CRA) by Electron Beam Lithography (EBL). The sensitivity of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27e066710d79f8501df6439449ae8d0b
https://doi.org/10.1117/12.916145

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Development of molecular resists based on Phenyl[4]calixarene for EBL

Autor: Masaaki Takasuka, Yu Okada, Hiromi Hayashi, Masatoshi Echigo

Publikováno v: SPIE Proceedings.

In this paper, we report current performance of the negative-tone molecular resists based on calix[4]resorcinarene (CRA) by Electron Beam Lithography (EBL). We have developed hydroxyphenyl calix[4]resorcinarenes (H-CRAs) designed hydroxy-groups outer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eeecf6d7362adc0555a759f3ae92b034
https://doi.org/10.1117/12.879122

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