Helical aromatic urea and guanidine

被引：72

作者：

Tanatani, A

Kagechika, H

Azumaya, I

Fukutomi, R

Ito, Y

Yamaguchi, K

Shudo, K

机构：

[1] UNIV TOKYO,FAC PHARMACEUT SCI,BUNKYO KU,TOKYO 113,JAPAN

[2] CHIBA UNIV,CTR CHEM ANAL,INAGE KU,CHIBA 263,JAPAN

来源：

TETRAHEDRON LETTERS | 1997年 / 38卷 / 25期

关键词：

D O I：

10.1016/S0040-4039(97)00922-2

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

N,N'-Dimethyl-N,N'-dipheylurea (1) and N,N'-Dimethyl N,N'-diphenylguanidinium bromide (2) each have folded structures with the two phenyl groups located face-to-face. Oligomeric compounds 3 and 4, having five benzene rings connected at the mera positions by cis-urea or guanidino groups, form aromatic layered helices in the crystal state. The crystals are racemic with a I : 1 enantiomer ratio. They exhibit stacked (3) or zigzag chain (4) packing, reflecting displaced parallel structure for the terminal phenyl groups of neighboring molecules of 3 and tilted T-shaped structure for those of 4, respectively. (C) 1997 Elsevier Science.

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页码：4425 / 4428

页数：4

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