Aromatic sulphenyl halides and thiocyanates, RSX, cleave aryltin bonds, ArSn , when the aryl groups contain strongly electron releasing substituents, to give monosulphides, RSAr. The reaction of o-NO 2 C 6 H 4 SCl and Ph 3 SnCHCH 2 gave both the cleavage product, CH 2 CHSC 6 H 4 NO 2 -o, and the addition product, Ph 3 SnCHClCH 2 SC 6 H 4 NO 2 -o. Other organotin bonds cleaved by o-NO 2 C 6 H 4 SCl are p-MeC 6 H 4 SCH 2 CH 2 Sn (to ...