Protecting Group NPB Test

Other Reagents V.iV -Dicyclohexylcarbodiimide, 4-dimethylaminopyridine, and hydrazine acetate. 

Comments Not commercially available. After cleavage, nitrophthalhydrazide results in an orange-colored solution. 

COLORIMETRIC TESTS FOR SOLID-PHASE ORGANIC SYNTHESIS 

Other Reagents 1,3-Diisopropylcarbodiimide (DIC) and 4-dimethylaminopyridine. Comments Commercially available. Methyl red reacts directly with hydroxyl groups without intermediates to a detection limit of 0.042 mmol/g. Provides an orange-red color. 

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