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Cover Picture: Long‐Lived Trifluoromethanide Anion: A Key Intermediate in Nucleophilic Trifluoromethylations (Angew. Chem. Int. Ed. 43/2014)
Author(s) -
Prakash G. K. Surya,
Wang Fang,
Zhang Zhe,
Haiges Ralf,
Rahm Martin,
Christe Karl O.,
Mathew Thomas,
Olah George A.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201407930
Subject(s) - cover (algebra) , counterion , nucleophile , ion , key (lock) , int , chemistry , crown (dentistry) , nuclear magnetic resonance spectroscopy , persistence (discontinuity) , crystallography , stereochemistry , materials science , organic chemistry , catalysis , computer science , geology , mechanical engineering , engineering , composite material , operating system , computer security , geotechnical engineering
CF 3−is a long‐lived species! For more than six decades, CF 3 − was believed to exist only as a short‐lived and kinetically unstable species in the condensed phase. In their Communication on page 11575 ff., G. K. S. Prakash et al. have obtained the first direct evidence for the persistence of the trifluoromethanide anion in THF by NMR spectroscopy. The experiments explicitly show that CF 3 − with the [K(18‐crown‐6)] + counterion is quite stable at low temperatures.