Cajachalcone: An Antimalarial Compound from Cajanus cajan Leaf Extract

Table 2

Proton-¹H NMR data of chalcones^a.

Position	Licochalcone^b	Butoxychalcone^c	Cajachalcone
2	6.43 (1H, s)	3.85 (3H, s, OMe)	6.90 (2H, d, J = 8.5, H2, H6)
3		6.47 (1H, d, J = 2.3)	7.35 (2H, d, J = 8.5, H3, H5)
	6.19 (1H, dd, J = 10, 18)
	5.31 (1H, d, J = 10, HB)
	5.34 (1H, d, J = 18, HC)
4		3.86 (3H, s, OMe)	3.80 (3H, s, OMe)
5	7.45 (1H, s)
6	3.81 (3H, s, OMe)
α	7.53 (1H, d, 𝐽=15)	7.56 (1H, d, J = 15.7)	7.54 (1H, d, J = 15.3)
β	8.03 (1H, d, 𝐽=15)	8.04 (1H, d, J = 15.7)	8.05 (1H, d, J = 15.3)
1^′
2^′, 6^′	7.97 (2H, d, 𝐽=8.5)	8.02 (2H, m)
3^′, 5^′	6.97 (2H, d, 𝐽=8.5)	6.95 (2H, m)	8.45 (2H, d, J = 8.7)
4^′			6.40 (1H, dd, J = 2.5, 2.5)
		4.04 (2H, t, J = 6.4, H1^′′)
		1.78 (2H, m, H2^′′)
		0.99 (3H, t, J = 7.4, H4^′′)

aJ values are in Hertz.
bSaitoh and Shibata, 1975 [12].
cChen et al., 1997 [13].