Oligostannanes synthesis

Shibata, K., Weinert, C. S. and Sita, L. R. (1998) Deconvoluting steric and electronic substituent effects on the properties of linear oligostannanes Synthesis and characterization of a new series incorporating the (Bu2Sn)-Sn-t group, Organometallics 17,2241-2248. 

SCHEME 10. Synthesis of oligostannanes via metal-halogen exchange... 

Despite the elegant nature of this chemistry, the sequence is cumbersome, since two steps are required in the chain growth step and the synthesis and purification of air-sensitive materials is time-consuming and lowers the overall yield of oligomeric products. A simple modification of the above synthetic strategy leads to the systematic construction of oligostannanes up to 15 tin atoms in the linear chain as shown in Scheme 3.8.2. ... 

Scheme 3.8.2 Synthesis of oligostannanes containing up to 15 tin atoms, (R = (Chl2)20Et)...

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