Silaallenes stability

How might this held develop in the future At this time, the chemistry of 1-silaallenes is fairly well understood, and that of 1-germaallenes is at least partially explored. Perhaps the series can be extended to 1 -stannaallenes, but these are predicted to have quite limited stability. The isolation of the 1,2.3-tristannaallcne shows that any combination of heteroatoms may be combined to form allenes... 

Three different research groups have examined the geometry and relative stabilities of silaallene and its various isomers (21,22,24). Silaallenes have been proposed as reaction intermediates by Kumada (119). 

The smaller polarity of the Si=C bond in 1-silaallenes probably contributes also to the remarkable kinetic stability of the stable silaallenes prepared by West and coworkers, but obviously steric factors play a dominant role in this case. Some product studies have been undertaken with the stable silaallene 572 and they are summarized in equation 212259. 

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