Clean Procedure and DFT Study for the Synthesis of 2-Amino-3-ethoxycarbonyl-4-(aryl)-4H-pyrano-[3,2-c]-chromene-5-ones Derivatives: A Novel Class of Potential Antimicrobial and Antioxidant Agents

Table 2

Theoretical and experimental vibrational frequencies (cm⁻¹) and theoretical infrared intensities (km mol⁻¹) of 5c.

	Experimental		Theoretical
	Frequencies	Intensities	Frequencies	Intensities
CO ester	1631	s	1812	219
CO lactone	1682	vs	1868	453
NH sym	3215	m	3569	155
NH asym	3350	m	3719	129