Abstract
yields identical within the error limit with those in Table 1. Phenolic esters of aliphatic carboxylic acids also undergo Fries rearrangement with TFMS. Electron donors in position 3 of the phenolic ester favor the TFMS-catalyzed rearrangement as the results in Table 1 indicate: starting from ( I d ) , ( 2 d ) was obtained in 78 % yield while ( 1 b ) remained unchanged under the reaction conditions. Surprisingly, ( I e ) did not rearrange even though the two methyl groups at C-3 and C-5 should enhance acylation of the arene nucleus. This finding can be rationalized in terms of reversibility of the Fries rearrangemen t.
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