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Photochemical electrocyclization of the allyl radical into the cyclopropyl radical
Author(s) -
Holtzhauer K.,
ComettaMorini C.,
Oth J. F. M.
Publication year - 1990
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.610030403
Subject(s) - chemistry , radical , cyclopropane , photochemistry , matrix isolation , ab initio , ab initio quantum chemistry methods , argon , computational chemistry , molecule , organic chemistry , ring (chemistry)
Abstract Following the observation that allyl radicals trapped in an argon matrix can be photolytically converted into cyclopropyl radicals (λ = 410 nm, 18 K), the IR spectrum of the cyclopropyl radical was recorded for the first time and interpreted. Bicyclopropane and cyclopropane are formed when the photolysed argon matrix is warmed from 18 to 35 K. The identification of these new species unequivocally proves the presence of cyclopropyl radicals in the photolysed matrix. This radical is shown to be a σ‐type ( C s symmetry) and not a π‐type ( C 2 v symmetry) radical; of the 18 normal frequencies of the C s cyclopropyl radical, all active in the IR, 16 were observed and were assigned to their corresponding normal modes. For this assignment advantage was taken of ab initio frequency computations reported in the literature and performed by the authors.