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Front Cover: Bulky Substituent Effect on Reactivity of Localized Singlet Cyclopentane‐1,3‐diyls with π‐Single Bonding (C‐π‐C) Character (Chem. Asian J. 23/2019)
Author(s) -
Akisaka Rikuo,
Abe Manabu
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201901388
Subject(s) - diradical , chemistry , substituent , cyclopentane , singlet state , homolysis , heterolysis , reactivity (psychology) , photochemistry , ring (chemistry) , stereochemistry , radical , organic chemistry , excited state , atomic physics , medicine , physics , alternative medicine , pathology , catalysis
Singlet diradicals are key intermediates in homolytic bond cleavage. Thorough investigation of the important intermediate is essential to understanding the fundamental reaction. For this purpose, long‐lived singlet diradicals are necessary. In this study, the effect of bulky substituents at the meta ‐position of the phenyl ring on the bond‐formation process in singlet 2,2‐diethoxy‐1,3‐diarylcyclopentane‐1,3‐diyls were evaluated. The bulky groups have significant influence on the diradical lifetime. When the triisopropylphenyl group was used, the lifetime was 45 times longer than that of the parent diradical in benzene at 293 K. More information can be found in the Full Paper by Rikuo Akisaka and Manabu Abe on page 4223 in Issue 23, 2019 (DOI: 10.1002/asia.201901253).