Table 1.

Comparison of product conversion values obtained from Raman spectra with those obtained using NMR spectroscopy for the conversion of salicylaldehyde and ethyl acetoacetate to 3-acetylcoumarin (1).

Conditions	Raman monitoring			NMR
	Concentration of 1 when diluted with acetone (mol L–1)	Concentration of 1 after normalizing for dilution by acetone (mol L−1)	Conv. (%)	Conv. (%)
25 °C, 1 mL/min	0.125	0.25	25	22
65 °C, 1 mL/min	0.27	0.55	55	58
130 °C, 1 mL/min	0.37	0.74	74	79
130 °C, 0.5 mL/min	0.39	0.78	78	80