The oxime I1 of 2-hydroxy-5-carboxyacetophe-none, on Beckmann rearrangement with sulfuric acid, produced a mixture of 3-acetamino-4-hydroxybenzoic acid and 2-methyl-5- carboxybenzoxazole. Thus the configuration of the oxime is cis with respect to the methyl, assuming that spacial isomerization did not take place during the treatment.
![2-Methylbenzo[d]oxazole-5-carboxylic acid Structure](https://image.chemsrc.com/caspic/291/90322-32-0.png)