Dialkyltin dialkoxides

Thermochemical data for the dissociation of dialkyltin dialkoxide dimers (neat liquids)... 

Under these conditions, dialkyltin oxides react to form only the dialkoxy-distannoxanes, though if these are heated at about 200 °C under reduced pressure, the dialkyltin dialkoxide can be distilled off, leaving a residue of the dialkyltin oxide.1 In tetrahydronaphthalene (b.p. 207 °C), however, phenols give the dialkyltin diphenoxides directly.4... 

The 1,3,2-dioxastannacycloalkanes can be prepared by the usual routes to organotin alkoxides, but whereas simple alcohols react with diorganotin oxides only to the stage of the distannoxanes (R 0)R2Sn0SnR2(0R ), 1,2-diols react further to give the dioxastannolanes (equation 14-41).61 62 The reactions proceed much more quickly (typically in 4 to 9 min) if the reactants are heated in a microwave oven.63 Similar reactions can be carried out with dialkyltin dihalides64 and, under milder conditions, with dialkyltin dialkoxides.65-67... 

If dialkyltin dialkoxides are treated with 98% hydrogen peroxide in ether, insoluble cyclic or linear dialkyltin peroxides (R2SnOO) are formed. These are thermally more stable than the bistrialkyltin peroxides, R3SnOOSnR3, and lose about half their peroxide content in one month at room temperature. If the reactions are carried out in the presence of an aldehyde, l,2,4-trioxa-3-stannolanes are formed, together perhaps with some oligomeric material.132... 

---