Hi,
I'm currently writing an essay on electron deficient compounds and whether they contain an appropriate number of electrons for their structures or not and feel like there are a few points that I'm missing out on.
So far what I've got on either side is:
In terms of not having an appropriate number of electrons
-they do not comply with the Lewis model (do not fit with the octet rule and contain covalent bonds in which pairs of electrons are shared between more than two atoms)
-their structures are still subject to debate. Techniques used to extract the structures of simpler boron hydrides, such as diborane, do not work on the higher boron hydrides. In the past there were clashes amongst chemists over the bonding that took place in 3-centre-2 bonds
In terms of having an appropriate number of electrons
-one could argue that the Lewis model is flawed rather than the electron deficient compounds.
-they often react in a similar way to more conventional compounds, such as in displacing metals. They are used in multiple useful reactions such as hydroboration which is very important in certain organic syntheses.
This is basically all I've got so far. The essay is supposed to be 3000-4000 words long so any pointers on what to add to it would be invaluable.
TIA