著者

Kazuki Ogata Daisuke Sasano Tomoya Yokoi Katsuhiro Isozaki Hirofumi Seike Nobuhiro Yasuda Tetsuya Ogawa Hiroki Kurata Hikaru Takaya Masaharu Nakamura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.2, pp.194-196, 2012-02-05 (Released:2012-02-04)

参考文献数

42

被引用文献数

15

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Novel NCN-pincer Pd-complex-bound norvaline derivatives were synthesized. The N- and C-termini-alkylated Pd–norvalines spontaneously assemble into fibrous aggregates to form supramolecular gels, in which the NCN-pincer Pd complex moieties assemble in a highly oriented manner.

著者

Hiroyoshi Sugino Hidetoshi Kawai Kenshu Fujiwara Takanori Suzuki

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.1, pp.79-81, 2012-01-05 (Released:2011-12-30)

参考文献数

23

被引用文献数

8

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Condensation reactions of macrocyclic diamines 1 and cyclohexane-1,4-dicarbaldehydes 2 with the substituents at 1,4-positions gave a series of macrocage molecules that can be considered molecular gyroscopes. The gyro-rotational behavior of the cyclohexane rotor is largely affected by the degree of steric requirement of the substituents, and isolation of syn-isomer suggests stepwise motion in the macrocages attached with bulky substituents on the rotor.

著者

Toshiaki Murai Yuichiro Mutoh

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.1, pp.2-8, 2012-01-05 (Released:2011-12-24)

参考文献数

99

被引用文献数

67

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Sequential reactions of thioamides and thioformamides with organolithium and Grignard reagents are described. Thioiminium salts derived from these sulfur isologues of amides readily react with lithium acetylides to lead to several types of products, including α,β-unsaturated ketones, whereas sequential additions of lithium acetylides and Grignard reagents afford propargylamines. The direct addition of organolithium and Grignard reagents to thioformamides proceeds with high efficiency to give a range of tertiary amines.

著者

Masashi Hasegawa Kota Daigoku Kenro Hashimoto Hiroyuki Nishikawa Masahiko Iyoda

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.85, no.1, pp.51-60, 2012-01-15 (Released:2012-01-15)

参考文献数

73

被引用文献数

53

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Intramolecular interactions of face-to-face tetrathiafulvalenes (TTFs) in 1,8-bis(tetrathiafulvalenyl)naphthalene frameworks were investigated in neutral and cationic states. From X-ray analysis and NMR spectroscopy on neutral 1,8-bis(tetrathiafulvalenyl)naphthalenes, which exist as a mixture of syn- and anti-isomers in solution, there is steric repulsion between TTF moieties. However, analysis of the cyclic voltammogram (CV) revealed that a strong attractive interaction was present in the cation radical state. Electronic spectra of the cation radical state showed the presence of a mixed-valence (MV) state with a strong charge resonance feature. ESR spectra of the 1,8-bis(tetrathiafulvalenyl)naphthalene cation radical showed a typical signal of an MV state. Furthermore, a π-dimer, which exhibits pronounced Davydov splitting in the electronic spectra, was formed in the dication state. The observed absorption bands in the electronic spectra were characterized by using quantum chemical calculations of the cation radical and dication species. NMR spectra of both the π-dimer and tetracation species show either a deshielding effect due to cationic charge or a shielding effect due to diamagnetic ring currents. To our knowledge, this is the first reported example of a 1H NMR spectrum of TTF π-dimer.

著者

Katsuhiko Ariga Ajayan Vinu Yusuke Yamauchi Qingmin Ji Jonathan P. Hill

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.85, no.1, pp.1-32, 2012-01-15 (Released:2012-01-15)

参考文献数

551

被引用文献数

638

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Although mesoporous materials have well-defined pore structures, these fine materials can surprisingly be produced by employing a set of conventional and simple procedures such as mixing, heating, filtration, and washing, using low-cost materials. They can be regarded as easy-to-make bulk nanostructured materials. Mesoporous materials have great potential for use in both macroscopic applications and nanotechnology. In this account, we introduce examples of recent developments in mesoporous materials involving innovations in their components and structural designs and concentrating on our own recent progress. These examples include syntheses of mesoporous silica, metal oxides, semiconductive materials, metals, alloys, organic composites, biomaterial composites, carbon, carbon nitride, and boron nitride, as innovative components. As structural innovations for mesoporous materials, various film preparations, pore alignments, and hierarchic structures are described together with their related functions including sensing and controlled release of target molecules.

著者

Hirofumi Nobukuni Takuya Kamimura Hidemitsu Uno Yuichi Shimazaki Yoshinori Naruta Fumito Tani

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

pp.1111210384-1111210384, (Released:2011-11-29)

参考文献数

32

被引用文献数

13

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Cyclic nickel and free-base porphyrin dimers (Ni2-CPDPy and H4-CPDPy) include fullerene C70 both in solution and in the crystals. Based on the 13C NMR spectra in solution, the included C70 molecule inside the cavity of Ni2-CPDPy shows both end-on and side-on orientations, whereas the C70 molecule within H4-CPDPy has only a side-on orientation toward the porphyrin rings. X-ray crystallography revealed both “end-on” and “side-on” orientations of C70 in the crystal structure of the inclusion complex of Ni2-CPDPy and C70. This is the first example of an X-ray crystallographic determination for an end-on orientation of C70 cocrystallized with porphyrins. On the other hand, only a side-on orientation of C70 was observed in the crystal structure of the complex of H4-CPDPy and C70. Further, a zigzag array of C70 molecules through van der Waals contacts with each other is formed along the monoclinic b axis in the latter crystal.

著者

Hideki Sugimoto Reiko Tajima Kazuo Toyota Hiroyuki Miyake Shinobu Itoh

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.10, pp.1146-1148, 2011-10-05 (Released:2011-09-28)

参考文献数

22

被引用文献数

1

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The reaction of bis(dithiolene)sulfidotungsten(IV) complex with elemental sulfur yielded bis(dithiolene)(tetrasulfido)tungsten(IV) complex. A labeling experiment using 34S has indicated that the reaction is reversible and a sulfido(trisulfido)tungsten(VI) species is involved as an intermediate. The reaction represents a model reaction of polysulfide reductase of molybdoenzymes.

著者

Akira Suzuki Yasunori Yamamoto

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.9, pp.894-901, 2011-09-05 (Released:2011-09-05)

参考文献数

88

被引用文献数

145

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The palladium-catalyzed cross-coupling reaction between different types of organoboron compounds and various organic halides or triflates in the presence of base provides a powerful and general methodology for the formation of carbon–carbon bonds. The Csp2–B compounds (such as aryl- and 1-alkenylboron derivatives) and Csp3–B compounds (alkylboron compounds) readily cross-couple with organic electrophiles to give coupled products selectively in high yields. Recently, the Csp–B compounds (1-alkynylboron derivatives) have been also observed to react with organic electrophiles to produce expected cross-coupled products. The overview of some of such coupling reactions is discussed here in this article.

著者

Hayato Tsuji Guillaume Marcel Olivier Favier Chikahiko Mitsui Sunri Lee Daisuke Hashizume Eiichi Nakamura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.6, pp.576-578, 2011-06-05 (Released:2011-04-28)

参考文献数

38

被引用文献数

23

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2,6-Di(2-pyridyl)benzo[1,2-b:4,5-b′]difuran (2-PyBDF) shows a π–π-stacking packing structure in a single crystal and some intriguing properties: mechanochromism in the solid state, and solvent and concentration dependence of absorption and emission spectra.

著者

Shinya Hayashi Yusuke Matsubara Seunghun Eu Hironobu Hayashi Tomokazu Umeyama Yoshihiro Matano Hiroshi Imahori

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.37, no.8, pp.846-847, 2008-08-05 (Released:2008-07-05)

参考文献数

15

被引用文献数

64

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Fused five-membered zinc porphyrin carboxylic acid has been synthesized to improve light-harvesting capability in the visible and near-infrared regions. The fused porphyrin-sensitized TiO2 cell exhibited the photocurrent generation extending over 800 nm, although the power conversion efficiency was found to be moderate (0.30%).

著者

Khiangte Vanlaldinpuia H Atoholi Sema Lalthazuala Rokhum Ghanashyam Bez

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.39, no.3, pp.228-229, 2010-03-05 (Released:2010-02-06)

参考文献数

24

被引用文献数

7

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Cbz-protection of aliphatic and aromatic amines can be accomplished with benzylchloroformate using a catalytic amount of dodecatungstophosphoric acid hydrate (0.05 equiv). The reaction is simple, fast, does not require aqueous work-up and gives excellent yields.

著者

Minoru Izumi Koichi Fukase

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.34, no.4, pp.594-595, 2005 (Released:2005-03-19)

参考文献数

18

被引用文献数

19

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New reductive benzylation of hydroxy functions was effected by using the combination of benzaldehyde, TMSCl, and Et3SiH. TMSCl first reacts with alcohols to form HCl, which is probably the ultimate catalyst for this reaction system. TMSCl can also trap water and thus effectively promote dehydration reactions when more than stoichiometric amount of TMSCl is used. Although excess TMSCl was required for the foregoing reactions, TMSCl could be readily removed by simple evaporation.