Distannanes polymer-supported

The polymer-supported distannane 90 was used as a source of stannyl radicals in several radical cyclization reactions, such as the photochemical radical chain addition of f-butyl iodide to acetylenes yielding the Z/E mixture of alkenes or the photochemical cyclization of citronellyl bromide to give menthane in high yields164 (Scheme 44). 

The one-step preparation of y-butyrolactones starting from an acyclic a-iodo ester was also investigated by using the polymer-supported distannane 90 as radical source. The y-butyrolactone was formed in 35% yield and contained 61% of the reduced a-haloester166 (Scheme 45). 

SCHEME 44. Polymer-supported distannane 90 as radical source in organic reactions... 

SCHEME 45. Polymer-supported distannane 90 for the synthesis of y -butyrolactones... 

Junl997 Junggebauer, J. and Neumann, W.P., An Improved Synthesis of a Polymer-supported Distannane and Its Application to Radical Formation, Tetrahedron, 53 (1997) 1301-1310. 

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