Applied Biological Chemistry

Table 1 ¹H- (400 MHz) and ¹³C-NMR (100 MHz) data of compounds 1-4 from Begonia semperflorens flowers (CD₃OD)

From: Pharmacological activity and quantitative analysis of flavonoids isolated from the flowers of Begonia semperflorens Link et Otto

Carbon number	δ_c				δ_H, coupling pattern, J in Hz
Carbon number	1	2	3	4	1	2	3	4
2	147.59	148.06	158.54	158.99
3	137.70	137.27	135.47	135.63
4	177.12	177.45	179.51	179.42
5	162.28	162.53	162.80	162.97
6	99.09	99.28	99.96	99.89	6.73, br. s	6.16, d, 2.0	6.19, d, 2.0	6.17, br. s
7	165.37	165.92	166.13	165.96
8	94.16	94.45	94.80	94.72	6.68, br, s	6.36, d, 2.0	6.39, d, 2.0	6.36, br. s
9	157.33	158.26	159.08	158.39
10	104.31	104.54	104.09	105.48
1′	123.43	123.76	122.80	122.92
2′	116.48	130.66	132.28	117.58	8.55, br. s	8.07, d, 9.2	8.05, d, 8.8	7.70, d, 2.0
3′	149.66	116.30	116.08	145.84		6.89, d, 9.2	6.88, d, 9.2
4′	146.91	160.54	161.58	149.82
5′	116.48	116.30	116.08	115.98	7.35, d, 8.4	6.89, d, 9.2	6.88, d, 9.2	6.85, d, 8.4
6′	120.93	130.66	132.28	123.19	8.08, br. d, 8.4	8.07, d, 9.2	8.05, d, 8.8	7.56, dd, 8.4, 2.0
1″			104.09	104.41			5.24, d, 7.2	5.22, d, 7.2
2″			75.74	75.70
3″			78.43	78.32
4″			71.37	71.17
5″			78.05	78.08
6″			62.64	62.53			3.68, dd, 12.0, 2.4 3.52, dd, 12.0, 5.2	3.71, dd, 12.0, 2.4 3.58, dd, 12.0, 5.2

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