• Carboxylic acids protected as their 2-bromoethyl esters are readily deprotected by cleavage with sodium trithiocarbonate: Synthesis, 715 (1974). 2-Bromoethyl esters of amino acids have been cleaved by conversion with NaI (Finkelstein) to the corresponding iodo esters, followed by reductive cleavage with Zn in DMF: Chem. Ber., 112, 2145 (1979); Angew. Chem. Int. Ed., 20, 894 (1981). See also Appendix 6.