An X-ray crystal structure determination of the title compound has confirmed the cyclic structure and has demonstrated a strong charge-transfer interaction between the carbonyl oxygen and the bromine atoms of adjacent molecules; the medium-dependent i.r. spectra of this molecule are discussed in the light of this finding.
D. Seyferth, H. Shih and M. D. LaPrade, J. Chem. Soc., Chem. Commun., 1972, 1036 DOI: 10.1039/C39720001036
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