Table 1.

NMR Spectroscopic Data (400 MHz, Acetone-d₆) for Flavanone 1

position	δC, type	δH (J in Hz)	HMBCa
2	80.5, CH	5.38, dd (13.0, 2.8)	4, 1′, 2′/6′
3α	44.9, CH2	2.96, dd (16.8, 13.0)	2, 4, 1′
3β		2.72, dd (16.8, 2.8)	4, 10
4	191.1, C
5	108.7, CH	7.18, s	6, 7, 8d, 9, 10
6	140.4, C
OH-6		8.23,c s	not observed
7	156.3, C
OH-7		8.49,c s	not observed
8	117.1, C
9	152.0, C
10	114.0, C
1′	131.8,b C
2′/6′	128.8, CH	7.40, d (8.5)	2, 3′/5′, 4′, 6′/2′e
3′/5′	116.1, CH	6.89, d (8.5)	1′, 4′, 5′/3′e, 2′/6′
4′	158.5, C
OH-4′		8.63,c s	not observed
1″	23.2, CH2	3.35, d (7.1)	7, 8, 9, 2″, 3″, 4″ d
2″	123.2, CH	5.24, m	8, 1″, 3″-Me, 4″
3″	131.9b, C
Me-3″	18.0, CH3	1.64, s	2″, 3″, 4″
4″	26.0, CH3	1.62, s	2″, 3″, 3″-Me

^aHMBC correlations, optimized for 8 Hz, are from proton(s) stated to the indicated carbon.

^b,cAssignments may be interchanged.

^dIndicates weak 4-bond correlation.

^eIndicates correlations to symmetric, equivalent carbons.