INTRAANNULARLY AND EXTRAANNULARLY FUNCTIONALIZED CHIRAL [2.2]METACYCLOPHANES - SYNTHESIS, CIRCULAR-DICHROISM, AND STRUCTURE CHIROPTIC RELATIONSHIPS

被引:8
作者
VOGTLE, F
KNOPS, P
OSTROWICKI, A
机构
[1] Institut für Organische Chemie und Biochemie, Universität Bonn, Bonn, D-5300
关键词
Absolute configuration; Circular dichroism; Helical molecules; Structure‐chiroptic relationships; 2.2]Metacyclophanes;
D O I
10.1002/cber.19901230918
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Intra‐ und Extraannularly Functionalized Chiral [2.2]Metacyclophanes: Synthesis, Circular Dichroism, and Structure ‐ Chiroptic Relationships A simple one‐step cyclization reaction for the synthesis of the title compounds 1‐5 is presented; separation (enrichment) of enantiomers is achieved by HPLC mainly on (+)‐PTrMA. The kinetics of interconversion (racemization) of the new dihetera[2.2]metacyclophanes are determined: No racemization of the internally substituted phanes is found on heating until decomposition, whereas the extraannularly substituted compounds exhibit barriers of interconversion of about 130 kJ/mol, similar to that of the unfunctionalized skeleton 1a. For the pyridinophane 2 the barrier (110 kJ/mol) is lower corresponding to the decreased spatial requirement of the nitrogen lone pair compared to a C‐H bond. The circular dichroism curves of the intraannularly functionalized phanes are compared with those of the extraannularly functionalized reference compounds: A bathochromic shift of the Cotton effect at short wavelengths is found, which is increasing with the bulkiness of the internal functional group. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码:1859 / 1868
页数:10
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