Abstract
Abstract The photolysis of tetrabromodiazocyclopentadiene (2) in low temperature Ar and N2 matrices generates the carbene, tetrabromocyclopentadienylidene (3). In O2-doped matrices, (3) reacts with oxygen yielding first tetrabromocyclopentadienone O-oxide (4), identification of which was aided by experiments with isotopically labelled oxygen, and then tetrabromocyclopentadienone (5) and tetrabromo-α-pyrone (6). The matrix uv-visible and infrared absorption spectra of tetrabromocyclopentadienone O-oxide (4) are reported.
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