Abstract
Reaction of β-nitrostyrenes with N ,N -dichloro-p -toluenesulfonamide (TsNCl2 ) has been successfully conducted by using either copper(I) chloride or 4-dimethylaminopyridine
(DMAP) as the catalyst. The reaction resulted in dichlorohaloamine products with the
opposite regiochemistry to that previously observed. In the presence of DMAP, the
reaction proceeded smoothly to completion within 24 hours at room temperature and
gave good chemical yields (65-88%). The structure of one of the products was confirmed
by X-ray crystal structure analysis. This reaction is proposed to occur through a
new mechanism involving a chloronium intermediate.
Key words
aminohalogenation - β-nitrostyrenes -
N ,N -dichloro-p -toluenesulfonamide - 4-dimethylaminopyridine
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