Chemfig drawing with arrows and Lewis dots

Question

If I wanted to draw something like this with the chemfig package, how would I do that?

I'm especially wondering how to draw the arrows in the most simple and beautiful way possible.

Update: With help from one of the replies i've managed to fully complete the right side of the arrow. My code so far looks like this:

\documentclass[border=5mm]{standalone}
\usepackage{chemfig}
\definesubmol{e}{-[,.15,,,draw=none]}

\begin{document}

\schemestart
    \chemfig{[:30]**6(--(-C(=[90]O)-O)----)}
    %
    \quad \arrow \quad
    %
    \chemfig{[:30]**6(--(!e\Lewis{0.,})----)}
    \arrow{0}[,0]\+
    \chemfig{C(=[90]O)(=[270]O)}
\schemestop

\end{document}

This is how it looks:

I'm still missing a few elements as you can probably see being:

1. The Lewis dot on the oxygen molecule is not showing.
2. The arrows are still missing.
3. The left side is not properly lined up with the arrow and the right side.

If anyone has any improvements to my code, feel free to say so! :)

Answer 1

\documentclass{article}

\usepackage{chemfig}
\usetikzlibrary{calc}

\begin{document}

\setchemfig{lewis radius =0.25ex,lewis sep =1ex}
\schemestart
\chemfig{
    [:-30]**6(---(@{a1}-[@{a2}0]C(=[2]O)(=[6,,,,draw=none]\phantom{O})
    -[@{a3}0]@{a4}\Lewis{0.,O}-[,0.7,,,draw=none])---)}
\arrow{->}
\chemfig{-[0,0.5,,,draw=none]**6(---(-[,0.3,,,draw=none]\Lewis{0.,})---)}
\arrow{0}[,0.2]
\+
\arrow{0}[,0.2]
\chemfig{C(=[2]O)(=[6]O)}
\schemestop
\chemmove{
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(-1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. (a1);
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(-1pt,0)$);
    \draw[arrows = {-Stealth[harpoon,swap]}, shorten <=2pt, shorten >=1pt]
        ($(a4)+(1.25ex,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(1pt,0)$);
}

\end{document}

Edit

change \Lewis to \charge

\documentclass{article}
\usepackage{chemfig}
\usetikzlibrary{calc}
\begin{document}
\setchemfig{lewis radius =0.25ex,lewis sep =1ex}
\schemestart
\chemfig{
    [:-30]**6(---(@{a1}-[@{a2}0]C(=[2]O)(=[6,,,,draw=none]\phantom{O})
    -[@{a3}0]@{a4}\charge{0=\.}{O}-[,0.7,,,draw=none])---)}
\arrow{->}
\chemfig{-[0,0.5,,,draw=none]**6(---\charge{0:2pt=\.}{}---)}
\arrow{0}[,0.2]
\+
\arrow{0}[,0.2]
\chemfig{C(=[2]O)(=[6]O)}
\schemestop
\chemmove{
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(-1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. (a1);
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(-1pt,0)$);
    \draw[arrows = {-Stealth[harpoon,swap]}, shorten <=2pt, shorten >=1pt]
        ($(a4)+(1.25ex,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(1pt,0)$);
}
\end{document}