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Inside Cover: A Puckered Singlet Cyclopentane‐1,3‐diyl: Detection of the Third Isomer in Homolysis (Chem. Eur. J. 7/2016)
Author(s) -
Ye Jianhuai,
Hatano Sayaka,
Abe Manabu,
Kishi Ryohei,
Murata Yusuke,
Nakano Masayoshi,
Adam Waldemar
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504855
Subject(s) - homolysis , diradical , singlet state , chemistry , cyclopentane , pentane , singlet fission , alkene , photochemistry , carbon fibers , double bond , stereochemistry , excited state , molecule , organic chemistry , radical , materials science , atomic physics , triplet state , physics , composite number , composite material , catalysis
Bond‐stretch isomerism is a fundamental concept in chemical bonding. To date, only two isomers, σ‐bonded isomers and planar singlet diradicals, have been identified in strained carbon–carbon homolysis. In the present study, the hitherto unknown third isomer, a puckered singlet diradical in the carbon–carbon bonding system of bicyclo[2.1.0]pentane, has been observed experimentally for the first time by careful selection of bulky substituents and using low‐temperature spectroscopy, both acting to “freeze frame“ the isomer. More information can be found in the Full Paper by M. Abe, R. Kishi, M. Nakano et al. on page 2299 ff.