Tin-containing compounds

As mentioned above the 1,1-organoboration reaction is reversible, and exchange is slow on the NMR timescale. This statement is in agreement with the chemical behavior of equilibrated mixtures of products. Thus, treatment of silicon borahomoadamantane derivative 92 with bis(trimethylstannyl)ethyne leads to the tin-containing compound 93 and liberation of bis(trimethylsilyl)ethyne (Scheme 44). With pyridine, the equilibrium is moved toward 1-boraadamantane completely due to the complexation <2001JOM(620)51>. 

If the conditions of equations 3-5 hold, the measured enthalpies of formation for the tin-containing compounds should fit the linear relationship of equation 7 ... 

Tin-containing compounds have been used in agriculture for many years as both fungicides (Chapter 4) and as acaricides. Tricyclohexyltin hydroxide and several related compounds (Figure 3.20), are very active against adult spider mites and are believed to act through an inhibition of oxidative phosphorylation. 

Zinc also interferes with the absorption calcium and selenium. Zinc absorption is usually decreased by aluminium-, phosphate- and tin-containing compounds,... 

Considering both the compound and amount related effects compromising the precision of carbon isotope analyses, the sensitivity of the analytical method used can be appointed to an amount down to approx. 5 ng for numerous anthropogenic contaminants. However, it has to be noted that in comparison the precision of the analyses of halogenated and tin containing compounds is generally lower. 

Akovali, G., Rzaev, Z. M. O., and Mamedov, D. G. 19%. Plasma surface modification of propylene-based polymers by silicon and tin-containing compounds. 

Sn NMR is a low-sensitivity nucleus that has a relatively wide chemical-shift range, which is useful in determining the identification of certain tin-containing compounds. The " Sn sensitivity is approximately 5.18 x 10 (at constant field) that of H. Its abundance (8.59%) is slightly higher than that of " Sn (7.68%) and much higher than that of Sn (0.34%). 

The tin-containing compounds involved in the above processes exercise their template function by controlling the conversion of non-cyclic diols to cyclic stan-noxanes. This activates the corresponding oxygen atoms, thus facilitating interaction of diacyl dihalides with the latter, to give macrocyclic tetralactones as the only... 

It turns out that distillation as a separation technique, is very much the domain of the organic chemist rather than the inorganic. One important exception is the cross-over area of organometallic chemistry for example, many tin-containing compounds, such as tetraethyltin and tri-n-butyltin hydride, are high boiling-temperature liquids, which are separated from the reaction mixture and purified by distillation. Tetraethyltin is prepared by the reaction of tin tetrachloride with ethylmagnesium bromide... 

---