# Using chemfig to draw complex ring structures

So I am trying to recreate the following reactions with chemfig but I am somewhat getting lost on what to do. I was able to start off with a general structure shown below. Any help would be much appreciated.

My MWE:

\documentclass{article}
\usepackage{chemfig,xstring}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\node at (0.15,-0.2) {\chemfig{
<[:-25,1.176]
(
-[0,0.01,,,line width=6.1pt,shorten <=-1.5pt,shorten >=-1.5pt]
(-[:225,1]H)(-[:320,1]CCl_3)>[:25,1.176]
-[:135,0.8]
-[180,1]
-[:-135,0.8]
)}};

\node at (0,2.85){\chemfig[double bond sep=0.3em]{
-[:25,1.176]
(
-[:-25,1.176]
<[:-135,0.8]
-[180,,,,line width=4.8pt,shorten <=-2.2pt,shorten >=-2.2pt]
>[:135,0.8]
)}};

\draw [dashed]  (0,1.75) -- (0,2.9);
\draw [dashed]  (0,0.3) -- (0,1.3);
\draw (0,0.3) ellipse (0.75cm and 0.35cm);
\draw (0,2.85) ellipse (0.75cm and 0.35cm);
\node at (0,1.5) {\Large Co};

\end{tikzpicture}
\end{document}