7-Hydroxy-4'-methoxyflavanone

5,2′-Dihydroxy-7-methoxyflavanone

“…The C2-C3 bond length of 1.500 (6) Å is in agreement with the corresponding values observed in flavanone structures: 1.502 (5) Å in 7-hydroxyflavanone (Kendi et al, 1995a), 1.528 (7) Å in 7-hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995b) and 1.511 (5) Å in 3-chloroflavanone (Tomlin & Cantrell, 1990). In flavones, the C2-C3 bond is a double bond, with an average bond length of 1.34 Å (Kaneda et al, 1973).…”

“…The dihydropyranone ring adopts an envelope conformation; the deviation of atom C2 from the O1/C8a/C4a/C4/C3 plane is 0.537 (7) Å . A similar conformation is observed in 7-hydroxyflavonone, 7-ethoxycarbonyl methoxyflavanone (Kendi et al, 1995a) and 7hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995b). The dihedral angle between the O1/C3-C8/C4a/C8a plane and the C1 0 -C6 0 benzene ring plane is 55.3 (1) .…”

“…The dihedral angle between the O1/C3-C8/C4a/C8a plane and the C1 0 -C6 0 benzene ring plane is 55.3 (1) . The corresponding angles are 103.0 (1) in 7-hydroxyflavanone, 121.5 (2) in 7ethoxycarbonylmethoxy flavanone (Kendi et al, 1995a), 65.2 (1) in 7-hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995b) and 70.8 (1) in 5,7,4 0 -trimethoxyflavanone (Mariezcurrena, 1978).…”

Disordered 6-hydroxyflavanone

“…There are known crystal structures of various flavanone derivatives in which enantiomers occupy equivalent sites in a random way. This type of disorder appears in the crystal structures of 5-hydroxy-7,4 0 -dimethoxyflavanone (Miles et al, 1989), 7-hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995), and naringenin (Cox et al, 2003). Cox et al (2003) suggest that the integrity of the crystal structures is maintained by the close overlap of equivalent atom positions in the two enantiomers, which can easily substitute for each other.…”

Disordered 4′-hydroxyflavanone

“…for 5-hydroxy-7,4 0 -dimethoxyflavanone (Miles et al, 1989) or for 7-hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995). for 5-hydroxy-7,4 0 -dimethoxyflavanone (Miles et al, 1989) or for 7-hydroxy-4 0 -methoxyflavanone (Kendi et al, 1995).…”