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FIGURE 6.14 Infrared spectrum due primarily to 3-H-furan-2-one formed in the photolysis of butenedial after subtraction of bands due to CO, C02, HCHO, and HCOOH (adapted from Bierbach et al., f994).

formation of maleic anhydride from butenedial, which is itself formed in the toluene-OH oxidation.

Further complicating mechanistic understanding is the possibility of different isomers of some of the multifunctional products. For example, one of the products of the p-xylene-OH reaction is 3-hexene-2,5-dione:

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