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1,3-Anionic Cycloadditions of 2-(N,N-Diisopropylcar-bamoyl) allyllithium with a Two-Step Mechanism

✍ Scribed by Dipl.-Chem. Willi Bannwarth; Dr. Rudolf Eidenschink; Prof. Dr. Thomas Kauff Mann

Book ID: 101550528
Publisher: John Wiley and Sons
Year: 1974
Tongue: English
Weight: 228 KB
Volume: 13
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.197404681

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✦ Synopsis

In order to cast some light upon the situation we have synthesized the colorless cyclotetraarene (1) [m. p. 254°C (from chloroform/ether 2: l)] as shown from the dibromides (3)"l (route A) and (4)181 (route B)I9'. The compound (I), which is obtained in 25 and 18% yield, respectively, is shown to be nonplanar by molecular models; instead it has the spatial structure (1 a).

CS (4)

[Z 24a I€]

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