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Alternative General Synthetic Routes to [2.2]Cyclophanes and [3.2]Cyclophanes from [3.3]Cyclophane-2,11-diones by Photodecarbonylation, and a Structural Study of [3.2]Metacyclophanes

✍ Scribed by Hajime Isaji; Mikio Yasutake; Hiroyuki Takemura; Katsuya Sako; Hitoshi Tatemitsu; Takahiko Inazu; Teruo Shinmyozu

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 748 KB
Volume: 2001
Category: Article
ISSN: 1434-193X
DOI: 10.1002/1099-0690(200107)2001:13<2487::aid-ejoc2487>3.0.co;2-f

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## Abstract 5,7,9‐Trimethyl[3~3~](1,3,5)cyclophane (1), with two binding sites of different donating ability, adopts a __C__~3~ conformation both in the solid state (−170 °C) and in CD~2~Cl~2~ solution at −90 °C. 5,7,9‐Trimethyl[3~3~](1,3,5)cyclophane‐2,11,20‐trione (9) has the same __C__~3~ symmet