From the reactions of bis{2-[(dimethylamino)methyl]phenyl}tin(IV) dibromide with two equivalents of cyclopentadienyl- or fluorenyllithium in THF, unexpected products [2-(CH3)(2)-NCH2C6H4](2)Sn(mu-eta(1):eta(1)-C5H4)(mu-O)Sn[2-(CH3)(2)NCH2C6H4](2) (2) and