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tert-Butyl esters are commonly used as protecting group of carboxylic acids in multi-step synthesis, especially with amino acids, peptides and natural products. [1] The importance of this relatively hindered protecting group is well established.
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ZnEt2 as a Precatalyst for the Addition of Alcohols to Carbodiimides
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Reagent-free continuous thermal tert-butyl ester deprotection - ScienceDirect