著者

Isamu Shiina Keisuke Ono Kenya Nakata

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.2, pp.147-149, 2011-02-05 (Released:2011-01-08)

参考文献数

18

被引用文献数

48

---

A variety of optically active 1-heteroarylalkanols and their esters, which include heteroaromatic moieties, such as 2-furyl, 2-thienyl, 3-thienyl, 2-thiazoyl, 2-benzothiazoyl, and 2-benzoxazoyl groups, are efficiently produced by a novel asymmetric esterification. The transition states that form the desired (R)-esters from the (R)-1-heteroarylalkanols are determined by DFT calculations, and the structural features of these transition states are systematically discussed.

著者

Daichi Kitagawa Seiya Kobatake

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.1, pp.93-95, 2011-01-05 (Released:2010-12-16)

参考文献数

37

---

A photochromic diarylethene having methoxymethyl groups at the reactive carbons was synthesized, and the thermal stability of the closed-ring isomer was examined. The closed-ring isomer of the diarylethene caused both the thermal cycloreversion and a thermally irreversible reaction at 120 °C. The structure of the thermal product was determined by 1H NMR, MS, and X-ray crystallographic analysis.

著者

Hiroyasu Tamura Yoshihiro Shinohara Tatsuo Arai

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.39, no.3, pp.240-241, 2010-03-05 (Released:2010-02-06)

参考文献数

22

被引用文献数

30

---

Ionic liquids having a photoresponsive stilbene chromophore were prepared and their properties were examined. While the trans isomers were all solid, most of the cis isomers were liquid at room temperature. The trans isomers give fluorescence emission with a quantum yield of ca. 0.02, while the cis isomers practically give no fluorescence. Thus, we could photochemically switch the properties of ionic liquid as well as emission properties by photochemical processes.

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

---

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

---

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

---

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.