Table 1: Experimental Condition for the Preparation of 4-Ethoxy-Cinnamic Acid and 4-Propoxy-Cinnamic Acid.

Run 4-Ethoxy-Benzadehyde
/ Mol
Malonic Acid
/ Molar
Pyridine
/ Molar
β-Alaninea
/ %
1 7.20 17.8 39.7 8
2 7.20 17.8 39.7 4
3 7.20 17.8 39.7 2

a % β-alanine = (molar of β-alanine/ molar of 4-ethoxy or propoxy-benzadehyde)*100%