N,N,N',N'-Tetrabromobenzene-1,3-disulfonamide (TBBDA)/PPh3 and N,N,M,N'-tetrachlorobenzene-1,3-disulfonamide (TCBDA)/PPh3 are two highly reactive reagent systems for the conversion of alcohols corresponding into alkyl chlorides and bromides in moderate to excellent yields in dichloromethane at room temperature under mild and neutral conditions.
