Answers are grounded in this paper and cite their sources.
N-Protected amino acid 4-phenolsulfonic acid derivative esters, such as 2, 6-dibromo-4- sulfophenyl ester sodium salt, 2, 6-dichloro-4-sulfophenyl ester potassium salt and 2-nitro-4- sulfophenyl ester sodium salt, were prepared. These esters are water-soluble active esters, and were applied for the synthesis of Leu-enkephalin.
No takes yet. Share an insight, caveat, or question.
Kawasaki et al. (1987) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: