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排序方式: 共有70条查询结果,搜索用时 31 毫秒
11.
Kanji Suyama Shizue Yamaguchi Masamitsu Shirai Masahiro Tsunooka 《Journal of polymer science. Part A, Polymer chemistry》2000,38(17):3043-3051
Copolymers bearing photoacid generating groups and/or photobase generating groups were dyed after UV irradiation with a dye bath containing both an acid dye and a basic dye. Acetophenone O‐acryloyloxime (AAPO) was used as a monomer bearing acyloxyimino (AOI) group that generates a primary amino group upon irradiation, which is followed by hydrolysis. Phenacylsulfonylstyrene (PSSt) and 1,2,3,4‐tetrahydronaphthylideneamino p‐styrenesulfonate (NISS) were chosen as monomers having β‐keto sulfone (β‐KS) and iminosulfonate (IS) groups, respectively, which yielded acid groups when irradiated. Copolymers of AAPO and methyl methacrylate (MMA) were dyed with only the acid dye, and those of PSSt or NISS were dyed with only the basic dye after irradiation. AAPO‐PSSt‐MMA films became dyeable with the acid dye when irradiated for a short time and with the basic dye with further irradiation. However, AAPO‐NISS‐MMA copolymers showed the reverse dyeing behavior. IR spectra revealed that AOI groups were photochemically decomposed prior to the β‐KS groups for AAPO‐PSSt‐MMA, and AOI and IS groups decomposed simultaneously for AAPO‐NISS‐MMA. These results suggested the possibility of adsorption of different ionic dyes on the films by a change of irradiation time; in fact, color patterns could be obtained in a single staining process using the dye bath. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 3043–3051, 2000 相似文献
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Kanji Suyama Shizue Yamaguchi Masamitsu Shirai Masahiro Tsunooka 《Journal of polymer science. Part A, Polymer chemistry》2001,39(10):1708-1715
Solubility changes in the irradiation of copolymers bearing photoacid- or photobase-generating groups and low molecular weight photobase generators (PBGs) or photoacid generators (PAGs) were investigated. Copolymers bearing acyloxyimino (AOI) groups were used as those generating pendant amino groups photochemically. Copolymers bearing o-nitrobenzyloxycarbonyl and imino sulfonate groups were used as those generating carboxy and sulfo groups, respectively. The solubility of copolymers bearing AOI groups into polar solvents was enhanced by added PAGs such as β-keto sulfones or imino sulfonates after irradiation. A similar enhancement was observed in copolymers bearing o-nitrobenzyloxycarbonyl groups in the presence of PBGs such as oxime esters or o-nitrobenzyl carbamates. These results showed that the formation of acid–base pairs on irradiation was effective for dissolution into polar solvents. Copolymers bearing imino sulfonate groups showed a high solubility, and no such enhancement was observed by PBG. Films of copolymers bearing β-keto sulfone groups became insoluble because of crosslinking. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1708–1715, 2001 相似文献
14.
Nakamura T Busfield WK Jenkins ID Rizzardo E Thang SH Suyama S 《The Journal of organic chemistry》2000,65(1):16-23
The thermolysis of a series of tert-alkyl peroxypivalates 1 in cumene has been investigated by using the nitroxide radical-trapping technique. tert-Alkoxyl radicals generated from the thermolysis underwent the unimolecular reactions, beta-scission, and 1,5-H shift, competing with hydrogen abstraction from cumene. The absolute rate constants for beta-scission of tert-alkoxyl radicals, which vary over 4 orders of magnitude, indicate the vastly different behavior of alkoxyl radicals. However, the radical generation efficiencies of 1 varied only slightly, from 53 (R = Me) to 63% (R = Bu(t)()), supporting a mechanism involving concerted two-bond scission within the solvent cage to generate the tert-butyl radical, CO(2), and an alkoxyl radical. The thermolysis rate constants of tert-alkyl peroxypivalates 1 were influenced by both inductive and steric effects [Taft-Ingold equation, log(rel k(d)) = (0.97 +/- 0. 14)Sigmasigma - (0.31 +/- 0.04)SigmaE(s)(c), was obtained]. 相似文献
15.
Shin-Ichi Ishikawa Kyozo Suyama Isamu Satoh 《Applied biochemistry and biotechnology》1999,78(1-3):521-533
Removal of radioactive elements from the effluent and waste aqueous solutions is an important problem. In previous laboratory
batch experiments, hen egg-shell membrane (ESM) was stable as an insoluble protein and was very capable of binding heavy metal
ions from aqueous solution. Batch laboratory pH profile, time dependency, and capacity experiments were performed to determine
the binding of uranium (U) and thorium (Th) to ESM. Batch pH profile experiments indicated that the optimum pH for binding
these actinides was approx 6.0 (U) or 3.0 (Th). The adsorption isotherms were developed at pH 5.0 (U) or 3.0 (Th) at 25°C,
and the adsorption equilibrium data fitted both Langmuir and Freundlich models. The maximum uptakes by the Langmuir model
were about 240 mg U/g and 60 mg Th/g dry weight ESM. In addition, their adsorption capacities increased as salt concentration
increased. ESM could also accumulate uranium from dilute aqueous solution by adjusting to the optimum pH. These results showed
that ESM was effective for removing actinides from solution and would be useful in filtration technology to remove actinides
from aqueous solution.
S.-I. Ishikawa is a research fellow at the Japan Society for the Promotion of Science. 相似文献
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Masato Matsugi Masakazu Hasegawa Shohei Hasebe Shohei Takai Ryusuke Suyama Yusuke Wakita Kanako Kudo Hiromi Imamura Toshiya Hayashi Seiichi Haga 《Tetrahedron letters》2008,49(26):4189-4191
A simple procedure for the perfluoroalkylation of the aromatic ring of phenols under mildly basic conditions is described. Treatment of a variety of phenols with perfluoroalkyl iodide in the presence of the radical initiator V-70L and Cs2CO3 provided the corresponding perfluoroalkylated products in moderate to good yields. Generally, the reaction proceeded smoothly at room temperature to yield regioselectively perfluoroalkylated products. 相似文献
18.
The first total synthesis of somocystinamide A, a disulfide dimer with extremely labile enamide functional groups, was accomplished in a concise and stereospecific manner. Somocystinamide A is reported to possess exceptionally potent antiangiogenic and tumoricidal activities. The current work should enable further pharmacological investigation of this important natural product. 相似文献
19.
Efficient Total Synthesis of Bongkrekic Acid and Apoptosis Inhibitory Activity of Its Analogues
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Dr. Kenji Matsumoto Masaki Suyama Satoshi Fujita Takuya Moriwaki Yukiko Sato Yoshifumi Aso Satoshi Muroshita Hiroshi Matsuo Keishi Monda Dr. Katsuhiro Okuda Dr. Masato Abe Dr. Hiroyuki Fukunaga Prof. Arihiro Kano Prof. Mitsuru Shindo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(32):11590-11602
Bongkrekic acid (BKA), isolated from the bacterium Burkholderia cocovenenans, is an inhibitor of adenine nucleotide translocator, which inhibits apoptosis, and is thus an important tool for the mechanistic investigation of apoptosis. An efficient total synthesis of BKA has been achieved by employing a three‐component convergent strategy based on Kocienski–Julia olefination and Suzuki–Miyaura coupling. It is noteworthy that segment B has been prepared as a new doubly functionalized coupling partner, which contributes to shortening of the number of steps. Torquoselective olefination with an ynolate has also been applied for the efficient construction of an unsaturated ester. Furthermore, it is revealed that 1‐methyl‐2‐azaadamantane N‐oxyl is an excellent reagent for final oxidation to afford BKA in high yield. Based on the total synthesis, several BKA analogues were prepared for structure–activity relationship studies, which indicated that the carboxylic acid moieties were essential for the apoptosis inhibitory activity of BKA. More easily available BKA analogues with potent apoptosis inhibitory activity were also developed. 相似文献
20.
Fujii Kengo Endo Nobuaki Hagen Nathan Yasugi Masaki Suyama Shiro Yamamoto Hirotsugu 《Optical Review》2022,29(5):429-439
Optical Review - We propose a method to realize video calling with an aerial display using a camera that has a direct view of the speaker's face, but which is not visible to the speaker.... 相似文献