I want to react the following molecule with conc. sulfuric acid in the presence of methanol at room temperature:
If I am right, this would make a methyl ester to be formed on the carboxyl.
The aim afterwards is to let it react with vanillin (in the presence of left over sulfuric acid) at 90°C, so it will give a coloured derivative.
Below is the structure of vanillin. As you can see, this has an aldehyde group and a hydroxy group.
Is it possible to let an aldehyde and ester react at higher temperatures?