Dialkyltin oxides. R2SnO

The exchange reaction between the Sn-O bond in dialkyltin oxides, R2SnO, and the SnCl bond in organotin halides is discussed in Section 12.4. 

The dialkyltin oxides, R2SnO, are beheved to be network coordination polymers with 5-coordinate tin atoms [137, 184, 185], and the effect of the structure on the recoil-free fraction has been discussed. 

Metals of groups III-VI (namely Ti, Sb, Ge, Bi), usually introduced as alkoxides, dialkyltin oxides R2SnO and carboxylates such as dibutyltin dilaurate, coordinate with the acylic oxygen of esters. 

The difunctional distannoxanes XR2SnOSnR2X can also be prepared from the reaction of (R2SnO) with R2SnX2, or from (R2SnO) and the appropriate amount of the acid HX. A further alternative is to heat the dialkyltin oxide with saturated aqueous NH4X (X = F, Cl, Br, I, OAc) in refluxing dioxane, and this probably provides the best route to the fluorides FR2SnOSnR2F.331... 

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