| abstract |
The present invention is directed to a process for preparing an aromatic or heteroaromatic sulfonyl halide represented by the formula (3), the process comprising halogenating an aromatic or heteroaromatic methyl sulfide represented by the formula (1) or an aromatic or heteroaromatic methyl sulfoxide represented by the formula (2) with a halogenating agent in the presence of water n n Ar(̵SCH 3-m X m ) n (1) n n n n Ar(̵SOCH 3-m X m ) n (2) n n n n Ar(̵SO 2 Y) n (3) n nwherein Ar is an aromatic ring or a heteroaromatic ring which is unsubstituted or which has an optional substituent or substituents, X and Y are halogen atoms, m is an integer of 0 to 3 and n is 1 or 2. n According to the present invention, aromatic or heteroaromatic sulfonyl halides can be produced industrially cheaply and easily. |