Reaction of dioxides derived from organosilicon thiocarbamides with ammonia and methylamine

Reactions of organosilicon thiocarbamide dioxides {[R 3 Si(CH 2 ) 3 NH] 2 CSO 2 , R = Et ( I ), O 1.5 ( II )} with methylamine and ammonia were studied. The reaction of compound I with ammonia involves, along with the substitution of the NHC(SO 2 )NH fragment by a guanidine residue, Si-C bond cleavage to form an oligomer comprising [O(Et)Si(CH 2 ) 3 NH] 2 C=NH and [O 1.5 Si(CH 2 ) 3 NH] 2 C=NH elementary units. The reactions of compound II with methylamine and ammonia resulted in the synthesis of organosilicon polymers containing guanidine groups. These polymers exhibit a high sorption capacity toward Ag(I).