Abstract Aryl Grignard reagents react with N, N??dimethyl O??(mesitylenesulfonyl) hydroxylamine in THF under Barbier conditions at room temperature and give N, N?? dimethylanilines with high yields in a 2??h reaction. The amination yield of in situ Grignard reagents were not lower than those of preformed aryl Grignard reagents. In situ cycloalkyl??, allyl??, and benzylmagnesium bromides did not react with N, N??dimethyl O??( ...