Star-shaped conjugated compounds forming nematic discotic systems

被引：76

作者：

Meier, H ^{[1
]}

Lehmann, M ^{[1
]}

Holst, HC ^{[1
]}

Schwöppe, D ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Organ Chem, D-55099 Mainz, Germany

来源：

TETRAHEDRON | 2004年 / 60卷 / 32期

关键词：

condensation; liquid crystals; photoreactivity;

D O I：

10.1016/j.tet.2004.06.012

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Star-shaped compounds, having a benzene (9a,b) or a 1,3,5-triazine (11a,b) core and stilbenoid arms were prepared. Hexyloxy chains, attached in the middle of the arms, provide nematic discotic phases N-D, which are unusual for such systems. The position of the sidechains prevents the micro-segregation, which is valid for star-shaped discs of columnar phases. The stilbenoid character of 9a,b and 11a,b guarantees a high light sensitivity. Apart from the statistical CC bond formation by irradiation in solution or in the LC phases, a topochemically controlled chemo-, regio- and stereoselective photocyclodimerization 11a-->12 was found in the crystalline state. The structure determination of 12 is based on different two-dimensional NMR techniques (COSY, NOESY, HMQC, HMBC). (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：6881 / 6888

页数：8

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