Trimethylgermyl group in Pauson–Khand reaction

The Pauson–Khand reaction of enynes possessing the trimethylgermyl group at the alkyne terminus stereoselectively afforded the corresponding bicyclo[3.3.0]octenone and bicyclo[4.3.0]decenone skeletons. The formed trimethylgermyl group of the bicyclic compound was then converted to the iodo group, which was used for further elaboration. Thus the trimethylgermyl group at the triple bond terminus was shown to become a precursor for other appendages.