Abstract
The direction of homolytic bromination of 4-X-3,5-dimethylisoxazoles (X=CH3, Cl. Br, p-O2NC6H4) with N-bromosuccinimide (NBS) was studied by PMR spectroscopy. Two of the three CH3 groups in 3,4,5-trimethylisoxazole react with NBS, and their activity decreases in the order 4-C>5-C »3-C. Only the CH3 groups in the 5 position react in the remaining compounds.
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