Abstract
The acetic acid analogues of thyroxine and triiodo-thyronine were synthesized from p-hydroxyphenylacetic acid. A synthetic route to 3:5-diiodo-4-(3'':4''-dihydroxyphenoxy) phenyl-L-alanine and its 5''-iodo derivative, possible products of the hydrolytic deiodination of triiodothyronine and thyroxine respectively, was explored. The RF values of the iodothyroacetic acids in a number of different solvent systems were compared with those of the corresponding iodothyronines.