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Strukturaufklärung eines Dimethylfulven‐Trimeren. Hinweis auf eine [6 + 4]‐Cycloaddition von 6, 6‐Dimethylfulven
Author(s) -
Uebersax Beat,
Neuenschwander Markus,
Engel Peter
Publication year - 1982
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19820650110
Subject(s) - chemistry , trimer , cycloaddition , fulvene , stereochemistry , crystallography , dimer , organic chemistry , catalysis
Structure Elucidation of a Dimethylfulvene‐trimer. Evidence for a [6+ 4]‐Dimerization of 6, 6‐Dimethylfulvene Thermal reaction of pure 6, 6‐dimethylfulvene ( 1c ) at 60° gives an oligomeric mixture consisting mainly of fulvene‐trimers. The structure of the main product 3c is partially elucidated by 1 H‐NMR. investigations at 400 MHz and definitely confirmed by X‐ray analysis. The formation of 3c is explained in terms of a [6+4] dimerization, followed by a 1, 5‐proton‐shift and a final Diels‐Alder reaction.