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@@ -127,6 +127,62 @@ The heterogeneous mixture was subsequently clarified via filtration through a ce
 \end{table}
 
 
+\subsection{\ce{H2SO4} Catalyzed Tandem Hydrolysis--Esterification}
+
+The conversion of ASA to methyl salicylate proceeds via a one-pot tandem sequence (Scheme~\ref{sch:mechanism}). Concentrated \ce{H2SO4} serves as a Brønsted acid catalyst, activating the carbonyl groups toward nucleophilic attack by methanol, and as a dehydrating agent to shift the equilibrium.
+
+\begin{scheme}[H]
+  \centering
+  \small
+  \setchemfig{atom sep=2.0em, compound sep=5em, nodesep=2pt}
+  
+  % Wrapper to ensure vertical alignment of the three main components
+  \begin{tabular}{ccc}
+    \chemname{
+      \chemfig{*6(-=-(-O-[:-30](=[:-90]O)-[:+30]CH_3)=([:60]-[:90](=[:150]O)-[:30]OH)-=)}
+    }{\footnotesize Acetylsalicylic Acid}
+    & 
+    \parbox{2.5cm}{\centering $\xrightarrow[\Delta]{\ce{CH3OH, H2SO4}}$} 
+    & 
+    \chemname{
+      \chemfig{*6(-=-(-OH)=([:60]-[:90](=[:150]O)-[:30]O-[:+90]CH_3)-=)}
+    }{\footnotesize Methyl Salicylate}
+  \end{tabular}
+
+  \vspace{1.5em}
+  \caption{Tandem deacetylation and Fischer esterification sequence.}
+  \label{sch:mechanism}
+\end{scheme}
+
+The transformation encompasses two concurrent equilibrium-driven processes:
+
+\begin{enumerate}
+    \item \textbf{Acid-Catalyzed Solvolysis:} The acetoxy group undergoes transesterification with methanol to yield salicylic acid and methyl acetate (Eq~\ref{eq:solvolysis}).
+    \item \textbf{Fischer Esterification:} The carboxylic acid is esterified by the methanol solvent (Eq~\ref{eq:fischer}).
+\end{enumerate}
+
+\begin{equation}
+    \ce{R-OCOCH3 + CH3OH <=>[H+] R-OH + CH3COOCH3}
+    \label{eq:solvolysis}
+\end{equation}
+
+\begin{equation}
+    \ce{Ar-COOH + CH3OH <=>[H+] Ar-COOCH3 + H2O}
+    \label{eq:fischer}
+\end{equation}
+
+To drive the reaction toward the methyl salicylate product, a substantial stoichiometric excess of methanol was employed, utilizing Le Chatelier's principle to overcome the reversible nature of the esterification.
+
+\subsection{Work-up and Purification}
+
+Following reflux, the reaction was quenched in ice-cold distilled water. Methyl salicylate ($\rho \approx 1.17$ g/mL) was isolated as the organic phase via liquid--liquid extraction. Residual acidic species (\ce{H2SO4}, \ce{CH3COOH}) were neutralized using saturated \ce{NaHCO3}:
+
+\begin{equation}
+    \ce{H2SO4(aq) + 2NaHCO3(aq) -> Na2SO4(aq) + 2CO2(g) + 2H2O(l)}
+\end{equation}
+
+The organic extract was dried over anhydrous \ce{MgSO4} and filtered to yield the pure essential oil.
+
 \subsection{Outline}
 
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