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The 2,4‐Bis(diphenylmethylene)‐1,3‐cyclobutane‐dione Diradical Dianion and its Sulphur Analogues 2)
Author(s) -
Strehlow Thomas,
Voß Jürgen,
Spohnholz Rüdiger,
Adiwidjaja Gunadi
Publication year - 1991
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19911240613
Subject(s) - diradical , chemistry , cyclobutane , electrochemistry , reagent , sulfur , spectral line , computational chemistry , stereochemistry , crystallography , medicinal chemistry , organic chemistry , ring (chemistry) , singlet state , electrode , astronomy , excited state , physics , nuclear physics
2,4‐Bis(diphenylmethylene)‐1,3‐cyclobutanedione ( 1 ) is transformed into its sulphur analogues 2 and 3 with Lawesson's or Davy's reagent 5 a,b. An X‐ray structural analysis is performed on 3 . The electrochemistry of these compounds is surveyed. The products of the electrochemical reduction exhibit ESR spectra, which could not be attributed to the radical anions 1 ‐• , 2 ‐• , and 3 ‐• . Extensive semiempirical AM1/Cl calculations suggest the spectra to correspond to the diradical dianions. The experimental data are discussed in terms of the theoretical results.