1: 4M ammonia / methanol / 0.67 h / Ambient temperature 2: syn-2-nitrobenzaldehyde oxime, TMG / acetonitrile / 1 h / Ambient temperature; influence of other solvent(dioxane) on approximate rates of removal of aryl protecting groups; action of K2CO3 on protected thymidine in ag.dioxane solution; stability of protected thymidine in pyridine solution View Scheme