organic compounds
2-Formyl-3-hydroxy-9,10-anthroquinone
aFaculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia, bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia, and cInstitute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: seikweng@um.edu.my
The molecule of the title compound, C15H8O4, is approximately planar. An intramolecular O—H⋯O hydrogen bond is observed between the hydroxy and formyl groups. The crystal used was a nonmerohedral twin, with a minor twin component of 15.9%.
Related literature
For antileshmanial and antiplasmodial activities, see: Sittie et al. (1999). For the treatment of twinned diffraction data, see: Spek (2003).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2008).
Supporting information
10.1107/S1600536808032224/ci2681sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536808032224/ci2681Isup2.hkl
Rennellia elliptica Korth from the Rubiaceae family was collected from Kuala Keniam, Pahang, Malaysia. The root was chopped into small pieces and dried. The dried sample (1 kg) was ground and then extracted successively with hexane, dichloromethane and methanol. The dichloromethane extract was concentrated in vacuo to give 27 g crude extract. The crude extract was fractionated by
The column (60 cm X 5 cm) was packed with acid-washed silica gel and eluted with hexane, dichloromethane and methanol. Nine fractions were obtained, and 3-hydroxy-2-formyl-9,10-anthraquinone (41.5 mg) was isolated from the third fraction (hexane:dichloromethane, 30:70) by slow evaporation of the solvent mixture. The yellow crystals obtained were washed with acetone.Carbon- and oxygen-bound H-atoms were placed in calculated positions (C—H = 0.95 Å and O—H = 0.84 Å) and were included in the
in the riding model approximation, with U(H) set to 1.2–1.5Ueq(C,O). The crystal studied was a non-merohedral twin. The TwinRotMat in PLATON (Spek, 2003) gave the as (-1 0 0, 0 - 1 0, -0.343 - 0.049 1), whose inclusion in the lowered the R index from 11.3 to 8.7%. The twin component refined to 18.9%. The is deemed satisfactory although the wR2 value for all reflections is somewhat high. The structure has a long C5–C14 bond; as the anisotropic displacement parameters are normal, the likely reason is localization of the double bonds in the ring. On the other hand, the C13–C14 bond is somewhat short.Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2008).Fig. 1. The molecular structure of the title compound, showing 70% probability displacement ellipsoids. H atoms are drawn as spheres of arbitrary radii. |
C15H8O4 | Z = 2 |
Mr = 252.21 | F(000) = 260 |
Triclinic, P1 | Dx = 1.554 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 6.9194 (2) Å | Cell parameters from 1888 reflections |
b = 8.0650 (2) Å | θ = 3.3–28.3° |
c = 10.7601 (3) Å | µ = 0.11 mm−1 |
α = 86.250 (2)° | T = 100 K |
β = 83.214 (2)° | Block, yellow |
γ = 64.692 (2)° | 0.22 × 0.04 × 0.04 mm |
V = 538.96 (3) Å3 |
Bruker SMART APEXII area-detector diffractometer | 1880 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.024 |
Graphite monochromator | θmax = 27.5°, θmin = 2.8° |
ω scans | h = −8→8 |
4946 measured reflections | k = −10→10 |
2419 independent reflections | l = −13→13 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.087 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.343 | H-atom parameters constrained |
S = 1.11 | w = 1/[σ2(Fo2) + (0.1778P)2 + 2.2381P] where P = (Fo2 + 2Fc2)/3 |
2419 reflections | (Δ/σ)max = 0.001 |
173 parameters | Δρmax = 0.49 e Å−3 |
0 restraints | Δρmin = −0.44 e Å−3 |
C15H8O4 | γ = 64.692 (2)° |
Mr = 252.21 | V = 538.96 (3) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.9194 (2) Å | Mo Kα radiation |
b = 8.0650 (2) Å | µ = 0.11 mm−1 |
c = 10.7601 (3) Å | T = 100 K |
α = 86.250 (2)° | 0.22 × 0.04 × 0.04 mm |
β = 83.214 (2)° |
Bruker SMART APEXII area-detector diffractometer | 1880 reflections with I > 2σ(I) |
4946 measured reflections | Rint = 0.024 |
2419 independent reflections |
R[F2 > 2σ(F2)] = 0.087 | 0 restraints |
wR(F2) = 0.343 | H-atom parameters constrained |
S = 1.11 | Δρmax = 0.49 e Å−3 |
2419 reflections | Δρmin = −0.44 e Å−3 |
173 parameters |
x | y | z | Uiso*/Ueq | ||
O1 | 0.3155 (6) | 0.6486 (5) | 0.0888 (3) | 0.0251 (8) | |
O2 | 0.2501 (6) | 0.3493 (5) | 0.0941 (3) | 0.0242 (8) | |
H2 | 0.2611 | 0.4345 | 0.0490 | 0.029* | |
O3 | 0.2366 (5) | −0.0898 (4) | 0.4383 (3) | 0.0153 (7) | |
O4 | 0.2779 (5) | 0.4648 (4) | 0.6688 (3) | 0.0172 (7) | |
C1 | 0.3060 (7) | 0.6395 (6) | 0.2041 (4) | 0.0178 (9) | |
H1 | 0.3171 | 0.7336 | 0.2474 | 0.021* | |
C2 | 0.2786 (7) | 0.4901 (6) | 0.2772 (4) | 0.0143 (9) | |
C3 | 0.2544 (7) | 0.3500 (6) | 0.2187 (4) | 0.0161 (9) | |
C4 | 0.2356 (7) | 0.2059 (6) | 0.2894 (4) | 0.0152 (9) | |
H4 | 0.2187 | 0.1116 | 0.2500 | 0.018* | |
C5 | 0.2419 (6) | 0.2016 (5) | 0.4183 (4) | 0.0123 (8) | |
C6 | 0.2335 (6) | 0.0406 (5) | 0.4916 (4) | 0.0112 (8) | |
C7 | 0.2285 (6) | 0.0417 (5) | 0.6299 (4) | 0.0112 (8) | |
C8 | 0.2117 (7) | −0.1043 (6) | 0.7003 (4) | 0.0139 (8) | |
H8 | 0.1986 | −0.1999 | 0.6601 | 0.017* | |
C9 | 0.2144 (7) | −0.1091 (6) | 0.8286 (4) | 0.0179 (9) | |
H9 | 0.2031 | −0.2083 | 0.8766 | 0.021* | |
C10 | 0.2336 (7) | 0.0310 (6) | 0.8883 (4) | 0.0188 (9) | |
H10 | 0.2353 | 0.0269 | 0.9767 | 0.023* | |
C11 | 0.2503 (7) | 0.1762 (6) | 0.8187 (4) | 0.0173 (9) | |
H11 | 0.2645 | 0.2709 | 0.8594 | 0.021* | |
C12 | 0.2462 (6) | 0.1835 (5) | 0.6895 (4) | 0.0113 (8) | |
C13 | 0.2641 (6) | 0.3403 (6) | 0.6165 (4) | 0.0126 (8) | |
C14 | 0.2621 (6) | 0.3426 (5) | 0.4787 (4) | 0.0120 (8) | |
C15 | 0.2815 (7) | 0.4851 (6) | 0.4072 (4) | 0.0133 (8) | |
H15 | 0.2968 | 0.5801 | 0.4468 | 0.016* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.038 (2) | 0.0258 (18) | 0.0125 (16) | −0.0155 (16) | −0.0033 (13) | 0.0054 (13) |
O2 | 0.046 (2) | 0.0283 (18) | 0.0063 (15) | −0.0226 (17) | −0.0062 (13) | 0.0020 (12) |
O3 | 0.0194 (15) | 0.0131 (14) | 0.0147 (15) | −0.0079 (12) | −0.0028 (11) | −0.0009 (11) |
O4 | 0.0228 (16) | 0.0148 (15) | 0.0165 (15) | −0.0103 (13) | −0.0003 (12) | −0.0039 (11) |
C1 | 0.021 (2) | 0.017 (2) | 0.016 (2) | −0.0078 (17) | −0.0040 (16) | 0.0035 (16) |
C2 | 0.0146 (19) | 0.0149 (19) | 0.0119 (19) | −0.0053 (16) | −0.0011 (14) | 0.0030 (15) |
C3 | 0.017 (2) | 0.021 (2) | 0.0103 (19) | −0.0080 (17) | −0.0030 (15) | 0.0010 (15) |
C4 | 0.016 (2) | 0.016 (2) | 0.014 (2) | −0.0074 (16) | −0.0007 (15) | −0.0025 (15) |
C5 | 0.0106 (18) | 0.0107 (18) | 0.0135 (19) | −0.0032 (14) | 0.0010 (14) | 0.0003 (14) |
C6 | 0.0099 (17) | 0.0105 (18) | 0.0121 (19) | −0.0036 (14) | −0.0001 (14) | −0.0004 (14) |
C7 | 0.0109 (18) | 0.0114 (18) | 0.0103 (18) | −0.0038 (14) | −0.0025 (13) | 0.0011 (14) |
C8 | 0.0145 (19) | 0.0118 (18) | 0.015 (2) | −0.0053 (15) | −0.0023 (15) | 0.0013 (14) |
C9 | 0.019 (2) | 0.017 (2) | 0.017 (2) | −0.0081 (17) | −0.0012 (16) | 0.0055 (16) |
C10 | 0.024 (2) | 0.022 (2) | 0.0110 (19) | −0.0100 (18) | −0.0009 (16) | 0.0026 (16) |
C11 | 0.021 (2) | 0.018 (2) | 0.013 (2) | −0.0084 (17) | −0.0008 (16) | −0.0009 (15) |
C12 | 0.0108 (18) | 0.0112 (18) | 0.0109 (18) | −0.0039 (14) | −0.0002 (14) | −0.0005 (14) |
C13 | 0.0112 (18) | 0.0125 (19) | 0.0139 (19) | −0.0046 (15) | −0.0015 (14) | −0.0010 (14) |
C14 | 0.0116 (18) | 0.0112 (18) | 0.0127 (19) | −0.0044 (14) | 0.0001 (14) | −0.0002 (14) |
C15 | 0.0138 (19) | 0.0112 (18) | 0.014 (2) | −0.0049 (15) | 0.0006 (14) | −0.0017 (14) |
O1—C1 | 1.234 (5) | C7—C8 | 1.398 (5) |
O2—C3 | 1.345 (5) | C7—C12 | 1.403 (5) |
O2—H2 | 0.84 | C8—C9 | 1.380 (6) |
O3—C6 | 1.222 (5) | C8—H8 | 0.95 |
O4—C13 | 1.226 (5) | C9—C10 | 1.397 (6) |
C1—C2 | 1.464 (6) | C9—H9 | 0.95 |
C1—H1 | 0.95 | C10—C11 | 1.388 (6) |
C2—C15 | 1.400 (6) | C10—H10 | 0.95 |
C2—C3 | 1.407 (6) | C11—C12 | 1.391 (6) |
C3—C4 | 1.391 (6) | C11—H11 | 0.95 |
C4—C5 | 1.390 (6) | C12—C13 | 1.487 (5) |
C4—H4 | 0.95 | C13—C14 | 1.483 (6) |
C5—C14 | 1.410 (6) | C14—C15 | 1.387 (6) |
C5—C6 | 1.494 (5) | C15—H15 | 0.95 |
C6—C7 | 1.485 (5) | ||
C3—O2—H2 | 120.0 | C9—C8—H8 | 120.1 |
O1—C1—C2 | 122.8 (4) | C7—C8—H8 | 120.1 |
O1—C1—H1 | 118.6 | C8—C9—C10 | 120.4 (4) |
C2—C1—H1 | 118.6 | C8—C9—H9 | 119.8 |
C15—C2—C3 | 119.7 (4) | C10—C9—H9 | 119.8 |
C15—C2—C1 | 119.1 (4) | C11—C10—C9 | 120.0 (4) |
C3—C2—C1 | 121.2 (4) | C11—C10—H10 | 120.0 |
O2—C3—C4 | 117.9 (4) | C9—C10—H10 | 120.0 |
O2—C3—C2 | 121.8 (4) | C10—C11—C12 | 120.2 (4) |
C4—C3—C2 | 120.3 (4) | C10—C11—H11 | 119.9 |
C5—C4—C3 | 119.2 (4) | C12—C11—H11 | 119.9 |
C5—C4—H4 | 120.4 | C11—C12—C7 | 119.6 (4) |
C3—C4—H4 | 120.4 | C11—C12—C13 | 119.4 (4) |
C4—C5—C14 | 121.2 (4) | C7—C12—C13 | 121.1 (3) |
C4—C5—C6 | 118.4 (4) | O4—C13—C14 | 121.0 (4) |
C14—C5—C6 | 120.3 (4) | O4—C13—C12 | 121.0 (4) |
O3—C6—C7 | 121.3 (4) | C14—C13—C12 | 118.0 (3) |
O3—C6—C5 | 120.5 (4) | C15—C14—C5 | 119.0 (4) |
C7—C6—C5 | 118.1 (3) | C15—C14—C13 | 119.7 (4) |
C8—C7—C12 | 120.1 (4) | C5—C14—C13 | 121.3 (4) |
C8—C7—C6 | 118.9 (4) | C14—C15—C2 | 120.5 (4) |
C12—C7—C6 | 121.0 (3) | C14—C15—H15 | 119.8 |
C9—C8—C7 | 119.7 (4) | C2—C15—H15 | 119.8 |
O1—C1—C2—C15 | 176.5 (4) | C10—C11—C12—C7 | −1.0 (6) |
O1—C1—C2—C3 | −2.1 (7) | C10—C11—C12—C13 | 180.0 (4) |
C15—C2—C3—O2 | 179.8 (4) | C8—C7—C12—C11 | 1.0 (6) |
C1—C2—C3—O2 | −1.7 (7) | C6—C7—C12—C11 | −177.2 (4) |
C15—C2—C3—C4 | −0.7 (7) | C8—C7—C12—C13 | −180.0 (3) |
C1—C2—C3—C4 | 177.9 (4) | C6—C7—C12—C13 | 1.8 (6) |
O2—C3—C4—C5 | 179.3 (4) | C11—C12—C13—O4 | −1.5 (6) |
C2—C3—C4—C5 | −0.3 (7) | C7—C12—C13—O4 | 179.4 (4) |
C3—C4—C5—C14 | 1.4 (6) | C11—C12—C13—C14 | 179.2 (4) |
C3—C4—C5—C6 | −176.7 (4) | C7—C12—C13—C14 | 0.2 (6) |
C4—C5—C6—O3 | 5.1 (6) | C4—C5—C14—C15 | −1.6 (6) |
C14—C5—C6—O3 | −173.0 (4) | C6—C5—C14—C15 | 176.4 (3) |
C4—C5—C6—C7 | −176.8 (4) | C4—C5—C14—C13 | 178.7 (4) |
C14—C5—C6—C7 | 5.1 (6) | C6—C5—C14—C13 | −3.2 (6) |
O3—C6—C7—C8 | −4.6 (6) | O4—C13—C14—C15 | 1.6 (6) |
C5—C6—C7—C8 | 177.4 (4) | C12—C13—C14—C15 | −179.1 (4) |
O3—C6—C7—C12 | 173.7 (4) | O4—C13—C14—C5 | −178.7 (4) |
C5—C6—C7—C12 | −4.4 (6) | C12—C13—C14—C5 | 0.6 (6) |
C12—C7—C8—C9 | −0.5 (6) | C5—C14—C15—C2 | 0.7 (6) |
C6—C7—C8—C9 | 177.7 (4) | C13—C14—C15—C2 | −179.6 (4) |
C7—C8—C9—C10 | 0.0 (7) | C3—C2—C15—C14 | 0.4 (6) |
C8—C9—C10—C11 | 0.0 (7) | C1—C2—C15—C14 | −178.1 (4) |
C9—C10—C11—C12 | 0.5 (7) |
Experimental details
Crystal data | |
Chemical formula | C15H8O4 |
Mr | 252.21 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 6.9194 (2), 8.0650 (2), 10.7601 (3) |
α, β, γ (°) | 86.250 (2), 83.214 (2), 64.692 (2) |
V (Å3) | 538.96 (3) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.11 |
Crystal size (mm) | 0.22 × 0.04 × 0.04 |
Data collection | |
Diffractometer | Bruker SMART APEXII area-detector diffractometer |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4946, 2419, 1880 |
Rint | 0.024 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.087, 0.343, 1.11 |
No. of reflections | 2419 |
No. of parameters | 173 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.49, −0.44 |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour, 2001), publCIF (Westrip, 2008).
Acknowledgements
The authors thank the University of Malaya for supporting this study.
References
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