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Synthese und Struktur von Meldrums Olefin/Synthesis and Structure of Meldrum’s Olefin
-
Norbert Kuhn
,
Ahmed Al-Sheikh
Published/Copyright:
June 2, 2014
Abstract
Diisopropylidene ethylenetetracarboxylate, Meldrum’s olefin (4, Mel2) has been prepared from [HNEt3][(Mel)2CSMe] (8) and Meldrum’s acid (1, MelH2) in moderate yield. The X-ray analysis of 4 reveals a centrosymmetrical structure in which the two six-membered rings are folded along their carboxylate carbon axes by 34.9°) and linked by a conventional C-C double bond [1.3501(19) Å ]. The “unsymmetrical” structure of 8 is also discussed.
Received: 2003-12-23
Published Online: 2014-6-2
Published in Print: 2004-5-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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