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Kato, Jun*; Maekawa, Yasunari; Yoshida, Masaru
Chemistry Letters, 34(2), p.266 - 267, 2005/02
Times Cited Count：12 Percentile：43.01(Chemistry, Multidisciplinary)We have investigated the useful EB induced reactions of sulfonamide and sulfonate derivatives in the crystalline state. In this letter, we found that the EB sensitivity of sulfonic acid derivatives in the crystalline tate was much higher than that of the corresponding carboxylic acid derivatives, which was distinct from the results using other energy sources, to give Fries rearrangement products. It is notable that these reactions are solvent-free and are accompanied by the transformation of amide and ester linkages to hydrophilic aniline and phenol groups; especially, an acidic sulfonamide can be converted to the corresponding basic aniline derivatives. These new EB induced transformations can significantly contribute to designing new materials for EB lithography as well as nanoscopic architectures.
Yuasa, Kanako; Enomoto, Kazuyuki*; Maekawa, Yasunari; Kato, Jun*; Yamashita, Takashi*; Yoshida, Masaru
Journal of Photopolymer Science and Technology, 17(1), p.21 - 28, 2004/07
Times Cited Count：9 Percentile：31.07(Polymer Science)The electron beam (EB)-induced reactions of arylsulfonic acid esters, phenyl p-toluenesulfonate (1a), phenyl benzenesulfonate (1b), and phenyl 1-naphthalenesulfonate (1c), were examined in the balk state. The EB irradiation of 1a afforded the Fries rearrangement products, o- and p-hydroxyphenyl p-tolylsulfones (2a and 3a), phenol (5), and the oxidation product of 2a, o,p-dihydroxyphenyl p-tolylsulfone (4a), which has not been observed in photolysis. The irradiation of 1b, which is liquid at room temperature, gave Fries products, 5, and the oxidation product, o,p-dihydroxyphenyl phenylsulfone. On the other hand, the EB-induced reaction of 1c proceeded with the lowest reactivity through crystal to crystal transformation to afford Fries products and 5, but not oxidation product. The mechanistic study reveals that oxidation product 4a generated by the oxidation reaction of ortho-Fries product 2a but not para-isomer 3a with an active oxidant, which should result from the decomposition of 1a.
Machida, Masahiko; Koyama, Tomio*
Physical Review Letters, 90(7), p.077003_1 - 077003_4, 2003/02
Times Cited Count：37 Percentile：80.74(Physics, Multidisciplinary)no abstracts in English
Tokuda, Shinji
Purazuma, Kaku Yugo Gakkai-Shi, 74(5), p.503 - 511, 1998/05
no abstracts in English
Araya, Fumimasa; *; *; ;
Proc. of the Joint Int. Conf. on Mathematical Methods and Supercomputing in Nuclear Applications,Vol. 1, p.466 - 476, 1993/00
no abstracts in English
Araya, Fumimasa; *; *;
Doryoku, Enerugi Gijutsu No Saizensen : Shimpojiumu Koen Rombunshu 1992, p.225 - 230, 1992/00
no abstracts in English
Progress of Theoretical Physics, 55(2), p.340 - 355, 1976/02
Times Cited Count：12no abstracts in English
Sanada, Yukihisa; Sasaki, Miyuki; Miyazaki, Nobuyuki*; Torii, Tatsuo*
no journal, ,
Since the Fukushima Daiichi Nuclear Power Plant accident, various radiation imaging systems, including Compton cameras, have been developed. A fractal geometry-based detector (FRIE) has been developed as a detector that enables measurements in 360-degree directions, instead of the two-dimensional measurements of existing Compton cameras and pinhole-type cameras. In addition, by optimizing the inverse problem analysis method to match the characteristics of this detector, 3D radiation image reconstruction has been achieved. Here, as part of the series of presentations, we report the results of field tests in an environment using this detector system.
