\documentclass[12pt,border=1pt,tikz,class=scrartcl]{standalone}
\usepackage{xcolor}
\usepackage{pgfplots}
\usetikzlibrary{arrows.meta}
\usepackage{upgreek}
\usepackage{chemfig,chemmacros}
\usetikzlibrary{decorations.pathmorphing}
\chemsetup{ modules = all }
\renewcommand*\printatom[1]{\ensuremath{\mathsf{#1} } }
\setatomsep{2.5em}
\setdoublesep{.6ex}
\setarrowdefault{,1.5,semithick}
\setbondstyle{thick}

\begin{document}
\definesubmol\nobond{-[,0.25,,,draw=none]}
\schemedebug{false}
\schemestart
  \subscheme{
    \chemfig{\textcolor{blue}{Ra}-[:30](=[2]O)-[::-60]\textcolor{green}{Rb} }
    \arrow{->[\ch{NH2OH}]}
    \subscheme{
      \chemfig{\textcolor{blue}{Ra}-[:30](=[2]N-[::-30]@{b1}O-[::-60]H)
        -[::-60]\textcolor{green}{Rb} }
      \chemfig{@{b4}Cl-[@{b3}0]@{b2}*6(=N-(-Cl)=N-(-Cl)=N-)}
    }
    \arrow{->}[-90]
    \subscheme{
      \chemfig{\textcolor{green}{Rb}-[:30](=[2]N-[::-30]\textcolor{blue}{Ra})-[::-60]O-[::-60]H}
      \arrow{0}[-10,-.1]
      \chemfig{\textcolor{blue}{Ra}-[@{cc3}:30]@{cc2}(=[2]@{cc4}N-[@{cc1}::-30]O-[0]*6(-N=(-Cl)-N=(-Cl)-N=))
        -[::-60]\textcolor{blue}{Rb} }
    }
    \arrow{->}[180]
    \subscheme{
      \chemfig{\textcolor{green}{Rb}-[:30](=[::-60]O)-[2,,,2]HN-[::-30,,2]\textcolor{blue}{Ra} }
    }
    \arrow(@c9.north--){->}[90,2.5]
    \arrow(@c5.north east--){->}[60,2]
    \subscheme{
      \chemfig{\textcolor{green}{Rb}-[:30](=[2]N-[::-30]\textcolor{blue}{Ra})-[::-60]O
        -[0]@{d2}*6(=[@{d3}]@{d4}N-(-Cl)=N-(-Cl)=N-)}
      \arrow{0}[-90,-.01]
      \chemfig{H-@{d1}O-[::-60]N=[::-30](-[::60]Rb)-[::-60]Ra}
    }
    \arrow(--.north){->}[-60,1.5]
    \subscheme{
      \chemfig{\textcolor{green}{Rb}-[:30](=[2]N-[::-30]\textcolor{blue}{Ra})-[::-60]O
        -[@{e1}0]@{e4}*6(=@{e5}{\textbf N\fmch}-(-Cl)=N-(-Cl)=N-)}
      \arrow{0}[-90,-.1]
      \chemfig{@{e2}H-@{e3}{\textbf O}-[6]N=[6](-[::60]Rb)-[::-60]Ra}
      \arrow(e3--@e4){0}
    }
    \arrow{->}[180,2]
  }
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    \draw [thick, red, -stealth, shorten >=2pt] (e5).. controls +(north east:.5) and +(east:1).. (e4);
  }
\end{document}