SEARCH Articles Figures Tables Amides reaction with pyridine-sulfur trioxide Amines reaction with pyridine-sulfur trioxide Phenols reaction with pyridine-sulfur trioxide Pyridine with Pyridine-sulfur trioxide Sulfur trioxide Sulfur trioxide, addition compounds with pyridine, dimethylaniline Sulfur trioxide-pyridine, selective sulfation with Sulfur with pyridine