How it is aromatic ?

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1 Answer
anor277
Jun 29, 2018

Well, how many pi-"electrons" does it have...?

Explanation:

It has got 6. Are they constrained in a ring? "Yes..." Are they delocalized around the ring? "Yes again..." the boron atom is coordinatively unsaturated.

And by these criteria the beast is aromatic...in that it fulfils the "Huckel Criterion"

For a carbocylic analogue see the tropylium cation, C_7H_7^+ which is isoelectronic...

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