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The mixed anhydride with trifluoroacetic anhydride has been used to protect OH groups as mesitoate esters, very stable to base hydrolysis. The group can be removed reductively, e.g. with LiAlH4: J. Chem. Soc. (C), 2944 (1971), or AlH3: J. Org. Chem., 57, 3431 (1992)./n