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Preparation of Tin-Containing Intermediates

The use of performed dibutyltin dimethoxide is advantageous12-14 reactions of diols are complete in 5-15 min in benzene at reflux. This technique avoids the problems with working in methanol just mentioned, and gives better yields. The preparation of stannylene acetals is also accelerated by microwave irradiation,15 and selective reactions can be performed, albeit in low yields, on some diols and polyols by microwave irradiation in the presence of a catalytic amount of dibutyltin oxide.16,17 [Pg.19]

Tributylstannyl ethers are prepared in the same manner by reaction of alcohols with hexabutyldistannoxane (more commonly known as bistribu-tyltin oxide). Holzapfel et al. noted that the reaction in benzene requires only 0.5 molar equivalents of bistributyltin oxide to go to completion but takes 16 h at reflux (Fig. 2). This is probably because the tin-containing by-product of the first half of the reaction, tributyltin hydroxide, reacts much more slowly than the initial reagent.18 [Pg.19]

Dibutyltin oxide, dibutyltin dimethoxide, and hexabutyldistannoxane are commercially available. Di-f-butyltin dichloride is commercially available, but reactions of di-f-butylstannylene acetals are often very slow. In certain cases, there are advantages in using bulkier tin oxides or tin oxides that are sterically restricted, such as cyclic tin oxides.19,20 Non-commercial dialkyltin oxides may be prepared conveniently by the reaction of dialkyldiphenyltin with chloroacetic acid followed by sodium hydroxide.21 This procedure works well for the preparation of stannacycloalkanes as well as bulky dialkyltin oxides. [Pg.19]


See other pages where Preparation of Tin-Containing Intermediates is mentioned: [Pg.17]    [Pg.18]   


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