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First Detection of a π‐Coupled 1,5‐Diradical via Cycloaddition
Author(s) -
Kaupp Gerd,
Zimmermann Inge
Publication year - 1981
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198110181
Subject(s) - diradical , intermolecular force , cycloaddition , cyclopentanone , derivative (finance) , chemistry , ring (chemistry) , molecule , photochemistry , double bond , computational chemistry , polymer chemistry , organic chemistry , physics , singlet state , atomic physics , catalysis , financial economics , economics , excited state
The addition of a π‐bond to a five‐membered ring σ‐bond has been observed for the first time on irradiation of a crystalline film of the cyclopentanone derivative (1). Intermolecular addition of the π‐coupled 1,5‐diradical formed from (1) to the carbonyl group of a further molecule of (1) leads, aside from other dimers, to the spiroheterocycle (2) .
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