The expected product of the curved arrow mechanism is shown in the image.
By using the curved arrow mechanism, it can be shown that one lone pair or non-bonding electron pair of Oxygen atom attacks the 6th Carbon atom to form one O – C bond. Immediately, the C – O bond between the 6th Carbon atom and the 8th Oxygen atom breaks, and as a result one non-bonding electron pair of the 8th Oxygen atom increases.
For displaying electron transfers between atoms, chemists have created their own convention. The term "curved arrow formalism" or "curved arrow mechanism" refers to this.
The curved arrow's function is to depict the transfer of electrons from one site to another. Movement or migration of electrons occurs from the tail to the head. The majority of the arrows you'll see have a double-barb at the head that symbolizes the motion of two electrons.
Another technique to track changes in formal charge is with curved arrows:
The atom at the "tail" will formally "lose" one electron due to the donation of a pair of electrons from the "tail," increasing the charge of the atom by one.
Additionally, the atom at the "head" will formally "gain" one electron because two electrons are received at the "head," thereby making the charge negative by 1.
Learn more about the curved arrow mechanism here:
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