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The black decomposition product of isobutyl oleate at high temperatures is likely a complex mixture of carbon-based materials, including char, soot, and various aromatic hydrocarbons. The exact composition depends on the specific reaction conditions. Isobutyl oleate is an ester, and at high temperatures, it undergoes thermal decomposition (pyrolysis), leading to the breaking of chemical bonds and the formation of smaller molecules. Some of these molecules can further react and polymerize, forming the black residue.