著者

Hideyuki Tukada Toshihiro Hiraki Hiroshi Nakamura

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130108, (Released:2013-05-18)

被引用文献数

3

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[2]Rotaxanes constructed with an ethereal end-capped axle and a dibenzo-24-crown-8 wheel were synthesized from pseudorotaxanes bearing an alcoholic terminus and diaryl-diazomethanes using diphenyl phosphate as a catalyst. The reaction proceeded at room temperature in nonpolar solvents within several hours. The [2]rotaxanes thus obtained behaved as ammonium salts derived from a very strong base such as DBU. Thus, the amine form of the [2]rotaxane reacted with a weak acid, CO2–H2O, to give a bicarbonate salt of the [2]rotaxane, which turned back to the amine form after drying followed by evacuation.

著者

Hideyuki Tukada Toshihiro Hiraki Hiroshi Nakamura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.6, pp.630-632, 2013-06-05 (Released:2013-06-05)

参考文献数

28

被引用文献数

3

---

[2]Rotaxanes constructed with an ethereal end-capped axle and a dibenzo-24-crown-8 wheel were synthesized from pseudorotaxanes bearing an alcoholic terminus and diaryldiazomethanes using diphenyl phosphate as a catalyst. The reaction proceeded at room temperature in nonpolar solvents within several hours. The [2]rotaxanes thus obtained behaved as ammonium salts derived from a very strong base such as DBU. Thus, the amine form of the [2]rotaxane reacted with a weak acid, CO2–H2O, to give a hydrogencarbonate salt of the [2]rotaxane, which turned back to the amine form after drying followed by evacuation.

著者

Akihito Konishi Yasukazu Hirao Kouzou Matsumoto Hiroyuki Kurata Takashi Kubo

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.6, pp.592-594, 2013-06-05 (Released:2013-06-05)

参考文献数

50

被引用文献数

52

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The improved Scholl reaction allows for the direct cyclization of anthracene oligomers to give bisanthene, teranthene, and quateranthene. Furthermore, a variety of π-expanded bisanthenes are obtained by the Diels–Alder cycloaddition of bisanthene with several arynes. These reactions would allow us to synthesize various size- and shape-controlled polyperiacenes.

著者

Azusa Kikuchi Jiro Abe

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.34, no.11, pp.1552-1553, 2005 (Released:2005-10-15)

参考文献数

10

被引用文献数

11

---

On irradiation with UV light, the photochromic dimer of 1,4-bis(imidazolyl)tetrafluorobenzene produced the colored transient species in solution and solid. Though the dimerization reaction to form the photochromic dimer prevents the isolation and characterization of the colored species at room temperature, the single crystals of the colored species could be successfully obtained from the light-irradiated toluene solution of the dimer at 200 K, and the molecular structure of the colored species is unambiguously determined by the X-ray diffraction analysis.

著者

Koyu Aoki Takeshi Morikawa Takeshi Ohwaki Yasunori Taga

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.35, no.6, pp.616-617, 2006 (Released:2006-05-13)

参考文献数

14

被引用文献数

20

---

Photocatalytic degradation in multiple contaminant system with a nitrogen-doped TiO2 visible-light photocatalyst was investigated. Formaldehyde and toluene were chosen as components of the contaminant. The degradation rate of toluene was depressed by coexisting formaldehyde, while that of formaldehyde was scarcely affected by coexisting toluene. This phenomenon is attributed to preferential adsorption of formaldehyde on the photocatalyst powder.

著者

Shujun Zhou Junzheng Wang Ayae Sugawara-Narutaki Atsushi Shimojima Tatsuya Okubo

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.5, pp.481-482, 2013-05-05 (Released:2013-05-05)

参考文献数

10

被引用文献数

4

---

Silica nanospheres (SNSs) synthesized with different base catalysts assemble into one-dimensional (1D) chain-like nanostructures at proper pH levels in the presence of the block copolymer F127. The addition of basic amino acids or the removal of base catalysts by dialysis influences the pH of 1D assembly. The base molecules affect assembly by modifying the electrostatic repulsion among the SNSs; however, they are not indispensable for this 1D assembly phenomenon.

著者

Yuki Tsuji Hiroyuki Ohno

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.5, pp.527-529, 2013-05-05 (Released:2013-05-05)

参考文献数

24

被引用文献数

10

---

Novel azolate-type ionic liquids (ILs), alkyltributylphosphonium benzimidazolates (alkyl chain: methyl, butyl, and octyl), were prepared by neutralization of the corresponding alkyltributylphosphonium hydroxides with benzimidazole. All the azolate-type ILs prepared here showed high ionic conductivities above 10−3 S cm−1 at 80 °C, and good thermal stability over 300 °C. They are expected to be useful platforms for functional ILs having good thermal stabilities.

著者

Shunsuke Tamba Kanta Fuji Hikaru Meguro Shuji Okamoto Tadashi Tendo Ryo Komobuchi Atsushi Sugie Takashi Nishino Atsunori Mori

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.3, pp.281-283, 2013-03-05 (Released:2013-02-23)

参考文献数

62

被引用文献数

36

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High-molecular-weight head-to-tail-type regioregular polythiophenes are synthesized by [CpNiCl(SIPr)]-catalyzed dehydrobrominative polycondensation. Polycondensation of 2-bromo-3-hexylthiophene at the C–H bond proceeds with an equimolar amount of TMPMgCl·LiCl and a catalytic amount of [CpNiCl(SIPr)] to afford the regioregular poly(3-hexylthiophene) (HT-P3HT) with up to Mw = 815000. A self-standing HT-P3HT film is obtained with the regioregular HT-P3HT of Mw = 414000, while the attempted formation of the corresponding film with lower-molecular-weight HT-P3HT (Mw = 38000) is unsuccessful.

著者

Masa-aki Kishida Satoshi Muratsugu Ryota Sakamoto Tetsuro Kusamoto Hiroshi Nishihara

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.121264, (Released:2013-03-19)

被引用文献数

7

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We prepared dimethyldihydropyrene (DHP) derivative 2 which possesses two ferrocenyl groups at the 4 and 9 positions through ethynylene linkers. 2 showed intense electronic communication between the two ferrocenyl groups, which is promoted by the highly developed π-orbital of the diethynylDHP moiety.

著者

Takaaki Ikuno Atsuro Nomura Kenta Iyoki Ayae Sugawara-Narutaki Tatsuya Okubo Atsushi Shimojima

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.3, pp.316-317, 2013-03-05 (Released:2013-03-02)

参考文献数

14

被引用文献数

10

---

A facile approach is demonstrated for the preparation of hollow mesoporous silica nanoparticles with large pore volume and high dispersibility. Core–shell nanoparticles consisting of iron oxide (α-Fe2O3) core and mesostructured silica–surfactant composite shell are treated with hexamethyldisiloxane under acidic conditions to achieve capping of silanol groups and removal of both surfactants and the Fe2O3 cores in a single step.

著者

Tomoyuki Iwamoto Yoichi Masui Jiacheng Wang Makoto Onaka

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.3, pp.247-249, 2013-03-05 (Released:2013-02-23)

参考文献数

12

被引用文献数

4

---

A novel template-free and postsynthetic preparation of a highly porous carbon nitride material, nanoC3N4, was developed using concentrated sulfuric acid as the dispersion medium, followed by impregnation with ethanol. nanoC3N4 has a structure similar to that of graphitic carbon nitride composed of melem polymers but has a stronger basicity.

著者

Satoshi Ueno Ryohei Maeda Shohei Yasuoka Ryoichi Kuwano

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.1, pp.40-42, 2013-01-05 (Released:2012-12-22)

参考文献数

59

被引用文献数

9 2

---

Amination at the β-position of 2-arylpropionitriles through catalytic dehydrogenation occurred by using [PdCl2(PMe3)2] catalyst and bromobenzene. This is the first catalytic reaction involving the direct dehydrogenation of saturated nitriles.

著者

Shoko Suzuki Ryota Sakamoto Hiroshi Nishihara

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.1, pp.17-18, 2013-01-05 (Released:2012-12-22)

参考文献数

23

被引用文献数

3

---

[Ru(tpy)(picSO)]BF4 (tpy: 2,2′:6′,2′′-terpyridine, picSO: 6-[(methylsulfinyl)methyl]picolinate) undergoes profound linkage isomerization behavior between stable S-bound and metastable O-bound isomers. S-[RuII(tpy)(picSO)]BF4 experiences photoisomerization to O-[RuII(tpy)(picSO)]BF4 upon irradiation with 436 nm light, whereas the back reaction is triggered with 546 nm light. Electrochemical linkage isomerization also takes place.

著者

Teruaki Mukaiyama Shu Kobayashi Hiromi Uchiro Isamu Shiina

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.19, no.1, pp.129-132, 1990 (Released:2006-05-08)

被引用文献数

31 83 76

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Highly enantioselective aldol reaction of silyl enol ethers with aldehydes is performed by the use of a catalytic amount of chiral diamine coordinated tin(II) triflate according to a slow addition procedure.

著者

Youhei Takeda Junpei Hayakawa Kazuki Yano Satoshi Minakata

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.12, pp.1672-1674, 2012-12-05 (Released:2012-12-08)

参考文献数

37

被引用文献数

3

---

An intermolecular benzylic C–H bond amination utilizing the combination of chloramine-T and I2 without the aid of transition-metal catalysts has been developed. The reaction was found applicable to a variety of benzene-substituted alkanes, as well as to an adamantane derivative to give N-alkylated p-tosylamides in good yields.

著者

Hisatoshi Konishi Hidekazu Nakamaru Hideki Nakatani Tsuyoshi Ueyama Kazuhiro Kobayashi Osamu Morikawa

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.26, no.2, pp.185-186, 1997 (Released:2004-05-01)

参考文献数

12

被引用文献数

11 6

---

The partial bromination of calix[4]resorcinarene with a limited amount of N-bromosuccinimide was examined. The ratio of the two dibromo derivatives, distal- and proximal-isomers, was 10:1, which is much different from the statistical value of 1:2. The simple procedure for the preparation of the distal-dibromo derivative is described.

著者

Mengsu Yang Richard Y. C. Kong Najam Kazmi Andrew K. C. Leung

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.27, no.3, pp.257-258, 1998 (Released:2003-02-28)

参考文献数

10

被引用文献数

18

---

Glass slides and silicon chips were modified with aminosilane and various linker molecules to provide activated surfaces for covalent immobilization of oligonucleotides under ambient condition, and the surface-attached oligonucleotides remain active for solid-phase DNA hybridization and polymerase chain reaction.

著者

Yasuhiro Morisaki Yoshiki Chujo

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.9, pp.840-846, 2012-09-05 (Released:2012-08-25)

参考文献数

67

被引用文献数

27 5

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Incorporation of a [2.2]paracyclophane skeleton into a conjugated polymer main chain affords a polymer comprising stacked π-electron systems. In this article, we describe the synthesis and optical properties of some [2.2]paracyclophane-based polymers on the basis of the results of our resent research. We discuss the role of [2.2]paracyclophane in the polymer backbone, through-space conjugation of the polymer, and the feasibility of using the titled polymers as single molecular wires that allow for unidirectional energy and charge transfer via through-space interactions.

著者

Tomoya Tanaka Hiroyuki Mayama Yoshimune Nonomura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.9, pp.960-961, 2012-09-05 (Released:2012-09-01)

参考文献数

14

---

We successfully determined the three-dimensional structure of agar gel droplets on multipillared surfaces. The contact angle, length of penetration of the agar gel into the interspace between pillars, and curvature of the bottom surface of the droplets were changed with respect to changes in the volume and concentration of the aqueous agar solution and the distance between the surface-bound pillars.

著者

Yoshimune Nonomura Tomoya Tanaka

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.9, pp.952-953, 2012-09-05 (Released:2012-09-01)

参考文献数

19

---

We observed the condensation of water and ethanol on a hydrophobic polymer film coated with fluorinated silicone particles and identified five states: the circular droplet, ellipsoidal droplet, network, huge droplet, and film states. The shape of the condensed droplets changed with the particle density and the wettability of the particles by the liquid.