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In the title compound, [TeBr2(C4H9)(C3H4BrO)] or C7H13Br3OTe, the primary geometry about the TeIV atom is a pseudo-trigonal-bipyramidal arrangement with axial bromines and one equatorial position vacant. If an intermolecular, secondary Te
O bond of 3.041 (5) Å, trans to the Te—C(vinylic) bond, is taken into consideration, the structure may be regarded as pseudo-octahedral. Distances and angles are: Te–Br 2.7295 (10) and 2.6115 (10), Te–C 2.092 (6) and 2.134 (7) Å; Br–Te–Br 176.59 (3), Br–Te–C 88.87 (19), 89.0 (3), 89.65 (19) and 88.2 (3), C–Te–C 99.7 (3)°. The lattice is formed by hydrogen-bonded centrosymmetric dimers [O
Br = 3.399 (6) Å], which, in turn, are linked by the intermolecular secondary Te
O bond.
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