Diorganotin Oxides and Hydroxides

More details of the hydrolysis pathway of diorganotin dihalides are shown in equation 12-16. A lot of attention has been paid to the various intermediates 12-7-12-12 that are formed, in part because of their potential use as catalysts. 

In the crystal, the hydrate 12-7 (R = Me3SiCH2, X = Cl) has R2SnCl2(OH2) units linked by Cl-Sn. .. Cl bridges so that the tin is octahedrally 6-coordinate. It dissociates in an organic solvent into the parent dichloride and water, and the 119Sn chemical shift changes from -53.9 in the solid to 146.6 in CDC13.58 

Like many triorganotin hydroxides, the diorganotin hydroxides R2Sn(OH)X (12-8) are readily dehydrated and are difficult to purify and characterise. For example, if dibutyltin 

The hydroxide hydride [(Me3Si)2CH]2Sn(OH)H, on the other hand, is hydrogen bonded by O-H. .. O bridges into a dimer, with rSnH 173(2) pm.68 

The dihydroxo compound (12-12) is known as the complexes which it forms with dis-tannaboratrioxanes and distannasilatrioxanes (see 12-50 and 12-55 below). 

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