Allenylsamarium iodides

Pentadiene-l,5-diols.. Alk generate allenylsamarium iodides, w hict unusual products. 

Samarium(II) iodide in the presence of Pd(0) can also promote this transformation. An example is the transformation of 5-alkenylpyranoside 106 into homoallyl cyclopentanols 107 (82% yield) and 108 (12% yield) [80], The first step is the formation of an allenylpalladium complex, followed by reduction by Sml2 and subsequent intramolecular allylation of the originated carbonyl-tethered allenylsamarium (Scheme 3.41). 

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