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\subsection{Testing for Phenol and derivatives}  \begin{itemize}  \item A purple complex will be formed with $Fe^{3+}$ in a neutral solution  \item Iron(III) Chloride  \end{itemize}  \subsection{Ester formation from Phenols and Acid Anhydrides}  \begin{itemize}  \item Alkaline conditions  \end{itemize}  \begin{align*}  C_6H_5OH+(CH_3CO)_2O\Rightarrow CH_3COOC_6H_5+CH_3COOH\\  \text{Phenol}+\text{Ethanoic Anhydride}\Rightarrow \text{Phenyl Ethanoate}+\text{Ethanoic Acid}\\  \end{align*}  Phenols will \textit{\textbf{not react}} with carboxylic acids to produce esters.  \subsection{Esterification of Salicylic Acid}  There are two ways to esterify salicylic acid.  \subsubsection{Esterification of the $OH$ group}  \begin{itemize}  \item Gives Aspirin  \item Esterified with acid anhydride  \item Fairly soluble  \end{itemize}  \subsubsection{Esterification of the $COOH$ group}  \begin{itemize}  \item Gives Oil of Wintergreen  \begin{itemize}  \item Methyl-2-hydroxybenzoate  \end{itemize}  \item Esterified with alcohol  \item Typically methanol  \end{itemize}