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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