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A Formal [4 + 2] Dimerization of 9-Cyclopropylidene-9H-fluorene

✍ Scribed by Dyker, Gerald ;Hillebrand, Gerhard ;Ernst, Ludger ;Dix, Ina ;Jones, Peter G.

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
331 KB
Volume
1996
Category
Article
ISSN
0947-3440

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✦ Synopsis

Abstract

The methylenecyclopropanes 7 and 8, with aryl substituents fixed in a coplanar conformation, show an extraordinary readiness to dimerize with formation of 10 and 11, respectively.

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In the solid state, the title compound, C 25 H 16 Br 2 O 2 , shows significant deviations of the fluorene ring system from planarity. A layered hydrogen-bonded structure is formed that may serve as a model for the solid-state structure of phenol-functionalized polyfluorene.

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✍ Alaa A. Hassan; Yusria R. Ibrahim; Ahmed M. Shawky; Dietrich Döpp 📂 Article 📅 2006 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 128 KB

## Abstract magnified image 4‐Substituted thiosemicarbazides **4a‐c** reacted with (2,4,7‐trinitro‐9__H__‐fluoren‐9‐ylidene)‐propanedinitrile (**2**) in pyridine with admission of air to form spiro[fluorene‐9,3′‐(1,2,4‐triazole)]derivatives **5a‐c** and (4‐substituted thiosemicarbazono)propanedini