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Synthesis of the Tris(9‐fluorenylidene)cyclopropane Dianion and Related Dianions: [3]Radialenes with Novel Electronic Properties
Author(s) -
Iyoda Masahiko,
Kurata Hiroyuki,
Oda Masaji,
Okubo Chiaki,
Nishimoto Kichisuke
Publication year - 1993
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.199300891
Subject(s) - cyclopropane , excited state , chemistry , ring (chemistry) , alkali metal , tris , ion , resonance (particle physics) , photochemistry , crystallography , organic chemistry , atomic physics , physics , biochemistry
The cyclopropenium ion with three exocyclic anionic substituents (1 A 2− ) is a resonance structure that according to NMR spectroscopic data is of great significance for the description of the bonding of the dianion 1 2− , which can be prepared by reduction of the [3]radialene 1 with alkali metals (MLi, Na). In contrast, as electronic spectroscopic investigations show, in the excited state a stronger back charge transfer into the central ring system occurs in 1 2− .
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