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Henry Rzepa's Blog

Henry Rzepa's Blog
Chemistry with a twist
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In the previous post, I found intriguing the mechanism by which methane (CH 4 ) inverts by transposing two of its hydrogens. Here I take a look at silane, SiH 4 . It appears it is a three-stage process! Firstly, silane eliminates molecular hydrogen to form a molecular complex between H 2 and SiH 2 (DOI: 10.14469/hpc/2290). The barrier (~60 kcal/mol) is very much lower than with methane.

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This is a spin-off from the table I constructed here for further chemical examples of the classical/non-classical norbornyl cation conundrum. One possible entry would include the transition state for inversion of methane via a square planar geometry as compared with e.g. NiH 4 for which the square planar motif is its minimum.