In the title compound, C
23H
24F
2O
3, the central pyran ring has a flat-boat conformation, whereas the two fused cyclohexenone rings adopt envelope conformations, with the C atom bearing the dimethyl substituent being the flap atom in each case. The pyran ring mean plane and the difluorophenyl ring are almost normal to each other, making a dihedral angle of 87.55 (4)°. In the crystal, molecules are linked by pairs of C—H

O hydrogen bonds, forming inversion dimers with an
R22(8) ring motif. The F atom at position 2 on the difluorophenyl ring is disordered over the 2- and 6-positions, and has a refined occupancy ratio of 0.932 (3):0.068 (3).
Supporting information
CCDC reference: 985439
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean
(C-C) = 0.002 Å
- Disorder in main residue
- R factor = 0.048
- wR factor = 0.147
- Data-to-parameter ratio = 25.2
checkCIF/PLATON results
No syntax errors found
Alert level C
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L= 0.600 7
Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details in the CIF Please Do !
PLAT154_ALERT_1_G The su's on the Cell Angles are Equal .......... 0.00200 Deg.
PLAT180_ALERT_4_G Check Cell Rounding: # of Values Ending with 0 = 3
PLAT199_ALERT_1_G Reported _cell_measurement_temperature ..... (K) 293 Check
PLAT200_ALERT_1_G Reported _diffrn_ambient_temperature ..... (K) 293 Check
PLAT301_ALERT_3_G Main Residue Disorder ............ Percentage = 4 Note
PLAT793_ALERT_4_G The Model has Chirality at C7 (Verify) R
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L= 0.600 115
0 ALERT level A = Most likely a serious problem - resolve or explain
0 ALERT level B = A potentially serious problem, consider carefully
1 ALERT level C = Check. Ensure it is not caused by an omission or oversight
8 ALERT level G = General information/check it is not something unexpected
3 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 ALERT type 2 Indicator that the structure model may be wrong or deficient
2 ALERT type 3 Indicator that the structure quality may be low
3 ALERT type 4 Improvement, methodology, query or suggestion
1 ALERT type 5 Informative message, check
5,5-dimethylcyclohexane-1,3-dione (1.15 g, 16 mmol) was treated with
2,4-difluorobenzaldehyde (0.6 g, 8 mmol) in ethanol (10 ml). The reaction
mixture was heated for 5 min. After cooling to room temperature, a solid
started to separate out. This solid was filtered, dried and then
recrystallized from ethanol to yield colourless block-like crystals of the
title compound [Yield 0.95 g; 80%].
Atom F1 on the difluorophenyl ring is slightly disordered, being attached to
atoms C23 and C19 with a refined occupancy ratio of 0.932 (3):0.068 (3), for
atoms F1:F1' and H19:H23. The H atoms were included in calculated positions
and treated as riding atoms: C-H = 0.93, 0.98, 0.97 and 0.96 Å for
CH(aromatic), CH, CH2 and CH3 H atoms, respectively, with Uiso(H)
= 1.5Ueq(C-methyl) and = 1.2Ueq(C) for other H atoms.
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: PLATON (Spek, 2009).
9-(2,4-Difluorophenyl)-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-2
H-xanthene-1,8-dione
top
Crystal data top
C23H24F2O3 | Z = 2 |
Mr = 386.42 | F(000) = 408 |
Triclinic, P1 | Dx = 1.288 Mg m−3 |
a = 9.6810 (4) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 10.4290 (4) Å | Cell parameters from 8029 reflections |
c = 11.8840 (5) Å | θ = 2.8–30.5° |
α = 69.288 (2)° | µ = 0.10 mm−1 |
β = 74.895 (2)° | T = 293 K |
γ = 63.406 (2)° | Block, colourless |
V = 996.03 (7) Å3 | 0.30 × 0.20 × 0.20 mm |
Data collection top
Bruker Kappa APEXII CCD diffractometer | 6738 independent reflections |
Radiation source: fine-focus sealed tube | 4248 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.026 |
ω and φ scan | θmax = 31.9°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −9→14 |
Tmin = 0.972, Tmax = 0.981 | k = −10→15 |
23107 measured reflections | l = −17→17 |
Refinement top
Refinement on F2 | 0 restraints |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.048 | H-atom parameters constrained |
wR(F2) = 0.147 | w = 1/[σ2(Fo2) + (0.0674P)2 + 0.1104P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
6738 reflections | Δρmax = 0.24 e Å−3 |
267 parameters | Δρmin = −0.18 e Å−3 |
Crystal data top
C23H24F2O3 | γ = 63.406 (2)° |
Mr = 386.42 | V = 996.03 (7) Å3 |
Triclinic, P1 | Z = 2 |
a = 9.6810 (4) Å | Mo Kα radiation |
b = 10.4290 (4) Å | µ = 0.10 mm−1 |
c = 11.8840 (5) Å | T = 293 K |
α = 69.288 (2)° | 0.30 × 0.20 × 0.20 mm |
β = 74.895 (2)° | |
Data collection top
Bruker Kappa APEXII CCD diffractometer | 6738 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 4248 reflections with I > 2σ(I) |
Tmin = 0.972, Tmax = 0.981 | Rint = 0.026 |
23107 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.048 | 0 restraints |
wR(F2) = 0.147 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.24 e Å−3 |
6738 reflections | Δρmin = −0.18 e Å−3 |
267 parameters | |
Special details top
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes)
are estimated using the full covariance matrix. The cell esds are taken
into account individually in the estimation of esds in distances, angles
and torsion angles; correlations between esds in cell parameters are only
used when they are defined by crystal symmetry. An approximate (isotropic)
treatment of cell esds is used for estimating esds involving l.s. planes. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | Occ. (<1) |
F1 | 0.58177 (9) | 0.33825 (10) | 0.21213 (9) | 0.0634 (3) | 0.932 (3) |
F1' | 1.0560 (15) | 0.0461 (17) | 0.3554 (14) | 0.078 (5) | 0.068 (3) |
F2 | 0.72300 (13) | 0.44738 (12) | 0.50286 (9) | 0.0828 (3) | |
O1 | 0.84119 (12) | −0.15460 (12) | 0.39286 (9) | 0.0627 (3) | |
O2 | 0.65242 (9) | 0.17594 (9) | 0.02533 (7) | 0.0434 (2) | |
O3 | 1.11867 (11) | 0.17515 (13) | 0.07618 (10) | 0.0686 (3) | |
C1 | 0.74840 (14) | −0.10446 (13) | 0.32037 (11) | 0.0420 (3) | |
C2 | 0.63396 (15) | −0.17246 (15) | 0.33580 (11) | 0.0473 (3) | |
H2A | 0.6041 | −0.2087 | 0.4218 | 0.057* | |
H2B | 0.6856 | −0.2578 | 0.3029 | 0.057* | |
C3 | 0.48605 (14) | −0.06656 (14) | 0.27502 (11) | 0.0435 (3) | |
C4 | 0.53389 (14) | 0.00773 (14) | 0.14367 (11) | 0.0430 (3) | |
H4A | 0.5750 | −0.0643 | 0.0971 | 0.052* | |
H4B | 0.4424 | 0.0891 | 0.1094 | 0.052* | |
C5 | 0.65262 (13) | 0.06655 (12) | 0.13208 (10) | 0.0373 (2) | |
C6 | 0.75128 (12) | 0.01894 (12) | 0.21271 (10) | 0.0371 (2) | |
C7 | 0.86725 (12) | 0.08662 (13) | 0.19491 (10) | 0.0381 (2) | |
H7 | 0.9692 | 0.0051 | 0.2097 | 0.046* | |
C8 | 0.87933 (12) | 0.17859 (13) | 0.06498 (10) | 0.0380 (2) | |
C9 | 1.01106 (13) | 0.22456 (14) | 0.01719 (12) | 0.0465 (3) | |
C10 | 1.01073 (15) | 0.32985 (16) | −0.10760 (13) | 0.0549 (3) | |
H10A | 1.0736 | 0.2719 | −0.1646 | 0.066* | |
H10B | 1.0605 | 0.3935 | −0.1099 | 0.066* | |
C11 | 0.85044 (15) | 0.42923 (14) | −0.15076 (12) | 0.0476 (3) | |
C12 | 0.76661 (16) | 0.32723 (14) | −0.13191 (11) | 0.0467 (3) | |
H12A | 0.6587 | 0.3880 | −0.1454 | 0.056* | |
H12B | 0.8143 | 0.2703 | −0.1911 | 0.056* | |
C13 | 0.77272 (13) | 0.22295 (13) | −0.00826 (10) | 0.0386 (2) | |
C14 | 0.38365 (17) | 0.05031 (19) | 0.34291 (15) | 0.0644 (4) | |
H14A | 0.4406 | 0.1052 | 0.3437 | 0.097* | |
H14B | 0.3532 | 0.0020 | 0.4246 | 0.097* | |
H14C | 0.2925 | 0.1174 | 0.3032 | 0.097* | |
C15 | 0.39565 (18) | −0.15434 (18) | 0.27371 (14) | 0.0616 (4) | |
H15A | 0.3623 | −0.1999 | 0.3555 | 0.092* | |
H15B | 0.4616 | −0.2302 | 0.2333 | 0.092* | |
H15C | 0.3064 | −0.0880 | 0.2316 | 0.092* | |
C16 | 0.75801 (18) | 0.54296 (16) | −0.07819 (15) | 0.0622 (4) | |
H16A | 0.6554 | 0.6002 | −0.1024 | 0.093* | |
H16B | 0.8098 | 0.6083 | −0.0931 | 0.093* | |
H16C | 0.7506 | 0.4920 | 0.0066 | 0.093* | |
C17 | 0.8681 (2) | 0.51037 (19) | −0.28546 (14) | 0.0716 (4) | |
H17A | 0.7671 | 0.5682 | −0.3125 | 0.107* | |
H17B | 0.9287 | 0.4387 | −0.3308 | 0.107* | |
H17C | 0.9196 | 0.5752 | −0.2976 | 0.107* | |
C18 | 0.82627 (12) | 0.18056 (13) | 0.28097 (10) | 0.0375 (2) | |
C19 | 0.92946 (14) | 0.15185 (14) | 0.35771 (11) | 0.0431 (3) | |
H19 | 1.0239 | 0.0699 | 0.3589 | 0.052* | 0.932 (3) |
C20 | 0.89720 (16) | 0.24020 (16) | 0.43221 (12) | 0.0514 (3) | |
H20 | 0.9683 | 0.2190 | 0.4825 | 0.062* | |
C21 | 0.75792 (18) | 0.35938 (16) | 0.42986 (12) | 0.0528 (3) | |
C22 | 0.64974 (16) | 0.39404 (15) | 0.35770 (13) | 0.0540 (3) | |
H22 | 0.5549 | 0.4753 | 0.3580 | 0.065* | |
C23 | 0.68774 (14) | 0.30316 (14) | 0.28486 (11) | 0.0454 (3) | |
H23 | 0.6157 | 0.3255 | 0.2350 | 0.054* | 0.068 (3) |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
F1 | 0.0438 (5) | 0.0656 (6) | 0.0797 (7) | 0.0015 (4) | −0.0322 (4) | −0.0315 (5) |
F1' | 0.058 (8) | 0.079 (10) | 0.093 (11) | −0.011 (7) | −0.035 (7) | −0.023 (8) |
F2 | 0.1159 (8) | 0.0833 (7) | 0.0739 (6) | −0.0448 (6) | −0.0094 (6) | −0.0435 (5) |
O1 | 0.0698 (6) | 0.0637 (6) | 0.0568 (6) | −0.0285 (5) | −0.0337 (5) | 0.0026 (5) |
O2 | 0.0467 (4) | 0.0482 (5) | 0.0423 (4) | −0.0277 (4) | −0.0157 (4) | −0.0010 (4) |
O3 | 0.0419 (5) | 0.0823 (7) | 0.0837 (7) | −0.0312 (5) | −0.0171 (5) | −0.0095 (6) |
C1 | 0.0434 (6) | 0.0413 (6) | 0.0406 (6) | −0.0136 (5) | −0.0113 (5) | −0.0101 (5) |
C2 | 0.0513 (7) | 0.0478 (7) | 0.0417 (6) | −0.0244 (6) | −0.0080 (5) | −0.0031 (5) |
C3 | 0.0430 (6) | 0.0481 (7) | 0.0434 (6) | −0.0237 (5) | −0.0058 (5) | −0.0090 (5) |
C4 | 0.0473 (6) | 0.0493 (7) | 0.0423 (6) | −0.0274 (5) | −0.0126 (5) | −0.0076 (5) |
C5 | 0.0407 (6) | 0.0386 (6) | 0.0369 (6) | −0.0189 (5) | −0.0086 (4) | −0.0081 (5) |
C6 | 0.0359 (5) | 0.0389 (6) | 0.0401 (6) | −0.0151 (5) | −0.0085 (4) | −0.0116 (5) |
C7 | 0.0308 (5) | 0.0386 (6) | 0.0460 (6) | −0.0105 (4) | −0.0119 (4) | −0.0121 (5) |
C8 | 0.0329 (5) | 0.0390 (6) | 0.0450 (6) | −0.0139 (4) | −0.0050 (4) | −0.0149 (5) |
C9 | 0.0343 (5) | 0.0485 (7) | 0.0593 (8) | −0.0164 (5) | −0.0029 (5) | −0.0197 (6) |
C10 | 0.0447 (7) | 0.0595 (8) | 0.0625 (8) | −0.0281 (6) | 0.0038 (6) | −0.0163 (7) |
C11 | 0.0523 (7) | 0.0446 (7) | 0.0515 (7) | −0.0272 (6) | −0.0044 (6) | −0.0101 (6) |
C12 | 0.0575 (7) | 0.0482 (7) | 0.0432 (7) | −0.0290 (6) | −0.0103 (5) | −0.0086 (5) |
C13 | 0.0394 (6) | 0.0396 (6) | 0.0425 (6) | −0.0192 (5) | −0.0056 (5) | −0.0124 (5) |
C14 | 0.0524 (8) | 0.0734 (10) | 0.0679 (9) | −0.0223 (7) | 0.0030 (7) | −0.0303 (8) |
C15 | 0.0641 (9) | 0.0684 (9) | 0.0636 (9) | −0.0449 (8) | −0.0104 (7) | −0.0041 (7) |
C16 | 0.0664 (9) | 0.0459 (7) | 0.0798 (10) | −0.0208 (7) | −0.0154 (8) | −0.0208 (7) |
C17 | 0.0896 (12) | 0.0714 (10) | 0.0602 (9) | −0.0517 (10) | −0.0078 (8) | 0.0005 (8) |
C18 | 0.0352 (5) | 0.0392 (6) | 0.0417 (6) | −0.0159 (5) | −0.0115 (4) | −0.0085 (5) |
C19 | 0.0396 (6) | 0.0474 (7) | 0.0462 (6) | −0.0201 (5) | −0.0148 (5) | −0.0065 (5) |
C20 | 0.0622 (8) | 0.0639 (8) | 0.0438 (7) | −0.0379 (7) | −0.0165 (6) | −0.0080 (6) |
C21 | 0.0731 (9) | 0.0549 (8) | 0.0443 (7) | −0.0352 (7) | −0.0045 (6) | −0.0180 (6) |
C22 | 0.0556 (8) | 0.0455 (7) | 0.0578 (8) | −0.0127 (6) | −0.0085 (6) | −0.0191 (6) |
C23 | 0.0411 (6) | 0.0476 (7) | 0.0489 (7) | −0.0130 (5) | −0.0157 (5) | −0.0136 (5) |
Geometric parameters (Å, º) top
F1—C23 | 1.3549 (13) | C11—C16 | 1.5239 (19) |
F1'—C19 | 1.230 (14) | C11—C17 | 1.5287 (19) |
F2—C21 | 1.3571 (15) | C11—C12 | 1.5330 (16) |
O1—C1 | 1.2193 (14) | C12—C13 | 1.4843 (17) |
O2—C5 | 1.3735 (13) | C12—H12A | 0.9700 |
O2—C13 | 1.3736 (13) | C12—H12B | 0.9700 |
O3—C9 | 1.2193 (15) | C14—H14A | 0.9600 |
C1—C6 | 1.4638 (16) | C14—H14B | 0.9600 |
C1—C2 | 1.5065 (17) | C14—H14C | 0.9600 |
C2—C3 | 1.5332 (17) | C15—H15A | 0.9600 |
C2—H2A | 0.9700 | C15—H15B | 0.9600 |
C2—H2B | 0.9700 | C15—H15C | 0.9600 |
C3—C14 | 1.522 (2) | C16—H16A | 0.9600 |
C3—C15 | 1.5292 (17) | C16—H16B | 0.9600 |
C3—C4 | 1.5299 (17) | C16—H16C | 0.9600 |
C4—C5 | 1.4851 (15) | C17—H17A | 0.9600 |
C4—H4A | 0.9700 | C17—H17B | 0.9600 |
C4—H4B | 0.9700 | C17—H17C | 0.9600 |
C5—C6 | 1.3389 (14) | C18—C23 | 1.3819 (17) |
C6—C7 | 1.5112 (14) | C18—C19 | 1.3904 (14) |
C7—C8 | 1.5089 (16) | C19—C20 | 1.3804 (18) |
C7—C18 | 1.5207 (16) | C19—H19 | 0.9300 |
C7—H7 | 0.9800 | C20—C21 | 1.363 (2) |
C8—C13 | 1.3388 (15) | C20—H20 | 0.9300 |
C8—C9 | 1.4684 (15) | C21—C22 | 1.3685 (19) |
C9—C10 | 1.5009 (19) | C22—C23 | 1.3730 (18) |
C10—C11 | 1.5310 (19) | C22—H22 | 0.9300 |
C10—H10A | 0.9700 | C23—H23 | 0.9300 |
C10—H10B | 0.9700 | | |
| | | |
C5—O2—C13 | 118.21 (8) | C11—C12—H12A | 109.2 |
O1—C1—C6 | 120.42 (11) | C13—C12—H12B | 109.2 |
O1—C1—C2 | 121.07 (11) | C11—C12—H12B | 109.2 |
C6—C1—C2 | 118.44 (9) | H12A—C12—H12B | 107.9 |
C1—C2—C3 | 114.85 (10) | C8—C13—O2 | 122.43 (10) |
C1—C2—H2A | 108.6 | C8—C13—C12 | 125.78 (10) |
C3—C2—H2A | 108.6 | O2—C13—C12 | 111.79 (9) |
C1—C2—H2B | 108.6 | C3—C14—H14A | 109.5 |
C3—C2—H2B | 108.6 | C3—C14—H14B | 109.5 |
H2A—C2—H2B | 107.5 | H14A—C14—H14B | 109.5 |
C14—C3—C15 | 109.58 (11) | C3—C14—H14C | 109.5 |
C14—C3—C4 | 110.53 (11) | H14A—C14—H14C | 109.5 |
C15—C3—C4 | 108.14 (10) | H14B—C14—H14C | 109.5 |
C14—C3—C2 | 110.07 (11) | C3—C15—H15A | 109.5 |
C15—C3—C2 | 110.10 (11) | C3—C15—H15B | 109.5 |
C4—C3—C2 | 108.39 (10) | H15A—C15—H15B | 109.5 |
C5—C4—C3 | 113.01 (9) | C3—C15—H15C | 109.5 |
C5—C4—H4A | 109.0 | H15A—C15—H15C | 109.5 |
C3—C4—H4A | 109.0 | H15B—C15—H15C | 109.5 |
C5—C4—H4B | 109.0 | C11—C16—H16A | 109.5 |
C3—C4—H4B | 109.0 | C11—C16—H16B | 109.5 |
H4A—C4—H4B | 107.8 | H16A—C16—H16B | 109.5 |
C6—C5—O2 | 123.04 (9) | C11—C16—H16C | 109.5 |
C6—C5—C4 | 125.44 (10) | H16A—C16—H16C | 109.5 |
O2—C5—C4 | 111.51 (9) | H16B—C16—H16C | 109.5 |
C5—C6—C1 | 118.82 (10) | C11—C17—H17A | 109.5 |
C5—C6—C7 | 122.11 (10) | C11—C17—H17B | 109.5 |
C1—C6—C7 | 119.06 (9) | H17A—C17—H17B | 109.5 |
C8—C7—C6 | 108.90 (9) | C11—C17—H17C | 109.5 |
C8—C7—C18 | 110.47 (9) | H17A—C17—H17C | 109.5 |
C6—C7—C18 | 113.06 (9) | H17B—C17—H17C | 109.5 |
C8—C7—H7 | 108.1 | C23—C18—C19 | 115.53 (11) |
C6—C7—H7 | 108.1 | C23—C18—C7 | 122.63 (9) |
C18—C7—H7 | 108.1 | C19—C18—C7 | 121.79 (10) |
C13—C8—C9 | 118.38 (11) | F1'—C19—C20 | 119.4 (6) |
C13—C8—C7 | 122.62 (10) | F1'—C19—C18 | 118.0 (7) |
C9—C8—C7 | 118.98 (10) | C20—C19—C18 | 122.57 (12) |
O3—C9—C8 | 120.69 (12) | C20—C19—H19 | 118.7 |
O3—C9—C10 | 121.52 (11) | C18—C19—H19 | 118.7 |
C8—C9—C10 | 117.76 (10) | C21—C20—C19 | 117.98 (11) |
C9—C10—C11 | 115.71 (10) | C21—C20—H20 | 121.0 |
C9—C10—H10A | 108.4 | C19—C20—H20 | 121.0 |
C11—C10—H10A | 108.4 | F2—C21—C20 | 119.12 (12) |
C9—C10—H10B | 108.4 | F2—C21—C22 | 118.00 (13) |
C11—C10—H10B | 108.4 | C20—C21—C22 | 122.88 (12) |
H10A—C10—H10B | 107.4 | C21—C22—C23 | 116.87 (12) |
C16—C11—C17 | 109.55 (12) | C21—C22—H22 | 121.6 |
C16—C11—C10 | 110.27 (11) | C23—C22—H22 | 121.6 |
C17—C11—C10 | 110.20 (12) | F1—C23—C22 | 117.04 (11) |
C16—C11—C12 | 110.34 (11) | F1—C23—C18 | 118.79 (11) |
C17—C11—C12 | 109.15 (11) | C22—C23—C18 | 124.17 (11) |
C10—C11—C12 | 107.29 (10) | C22—C23—H23 | 117.9 |
C13—C12—C11 | 112.16 (10) | C18—C23—H23 | 117.9 |
C13—C12—H12A | 109.2 | | |
| | | |
O1—C1—C2—C3 | 155.46 (12) | C9—C10—C11—C16 | 68.74 (15) |
C6—C1—C2—C3 | −27.60 (16) | C9—C10—C11—C17 | −170.19 (12) |
C1—C2—C3—C14 | −70.82 (14) | C9—C10—C11—C12 | −51.47 (15) |
C1—C2—C3—C15 | 168.27 (11) | C16—C11—C12—C13 | −70.88 (14) |
C1—C2—C3—C4 | 50.17 (14) | C17—C11—C12—C13 | 168.68 (12) |
C14—C3—C4—C5 | 73.46 (13) | C10—C11—C12—C13 | 49.28 (14) |
C15—C3—C4—C5 | −166.59 (11) | C9—C8—C13—O2 | 174.81 (10) |
C2—C3—C4—C5 | −47.24 (14) | C7—C8—C13—O2 | −6.63 (17) |
C13—O2—C5—C6 | 9.76 (16) | C9—C8—C13—C12 | −5.94 (18) |
C13—O2—C5—C4 | −168.91 (10) | C7—C8—C13—C12 | 172.62 (11) |
C3—C4—C5—C6 | 23.38 (17) | C5—O2—C13—C8 | −7.66 (16) |
C3—C4—C5—O2 | −157.99 (10) | C5—O2—C13—C12 | 173.00 (10) |
O2—C5—C6—C1 | −176.36 (10) | C11—C12—C13—C8 | −23.44 (18) |
C4—C5—C6—C1 | 2.12 (18) | C11—C12—C13—O2 | 155.88 (10) |
O2—C5—C6—C7 | 2.50 (18) | C8—C7—C18—C23 | 63.24 (14) |
C4—C5—C6—C7 | −179.02 (11) | C6—C7—C18—C23 | −59.07 (15) |
O1—C1—C6—C5 | 176.86 (12) | C8—C7—C18—C19 | −114.03 (11) |
C2—C1—C6—C5 | −0.10 (17) | C6—C7—C18—C19 | 123.66 (11) |
O1—C1—C6—C7 | −2.04 (17) | C23—C18—C19—F1' | −178.2 (9) |
C2—C1—C6—C7 | −179.00 (10) | C7—C18—C19—F1' | −0.8 (9) |
C5—C6—C7—C8 | −14.60 (15) | C23—C18—C19—C20 | −0.60 (18) |
C1—C6—C7—C8 | 164.25 (10) | C7—C18—C19—C20 | 176.85 (11) |
C5—C6—C7—C18 | 108.58 (12) | F1'—C19—C20—C21 | 177.9 (9) |
C1—C6—C7—C18 | −72.56 (13) | C18—C19—C20—C21 | 0.34 (19) |
C6—C7—C8—C13 | 16.67 (15) | C19—C20—C21—F2 | 179.57 (11) |
C18—C7—C8—C13 | −108.05 (12) | C19—C20—C21—C22 | 0.3 (2) |
C6—C7—C8—C9 | −164.77 (10) | F2—C21—C22—C23 | −179.89 (12) |
C18—C7—C8—C9 | 70.50 (12) | C20—C21—C22—C23 | −0.6 (2) |
C13—C8—C9—O3 | −172.78 (12) | C21—C22—C23—F1 | −179.17 (12) |
C7—C8—C9—O3 | 8.60 (18) | C21—C22—C23—C18 | 0.3 (2) |
C13—C8—C9—C10 | 5.27 (17) | C19—C18—C23—F1 | 179.75 (11) |
C7—C8—C9—C10 | −173.35 (11) | C7—C18—C23—F1 | 2.32 (18) |
O3—C9—C10—C11 | −156.79 (13) | C19—C18—C23—C22 | 0.26 (19) |
C8—C9—C10—C11 | 25.18 (17) | C7—C18—C23—C22 | −177.17 (12) |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
C20—H20···O1i | 0.93 | 2.38 | 3.3075 (15) | 177 |
Symmetry code: (i) −x+2, −y, −z+1. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
C20—H20···O1i | 0.93 | 2.38 | 3.3075 (15) | 177 |
Symmetry code: (i) −x+2, −y, −z+1. |
Xanthene is the parent compound of a number of naturally occurring substances and some synthetic dyes. Xanthene derivatives are used as dyes (Hilderbrand & Weissleder, 2007) and are used in medicine as they possess biological properties like antibacterial, antiviral and anti-inflammatory activities (Jonathan et al., 1988). Ehretianone, a quinonoid xanthene was reported to possess anti-snake venom activity (Selvanayagam et al., 1996; Lambert et al., 1997; Poupelin et al., 1978; Hideo, 1981). In view of the importance of the Xanthene derivatives we have synthesized the title compound and report herein on its crystal structure.
In the title molecule, Fig. 1, the pyran ring (O2/C5-C8/C13) has a flat boat conformation [Q = 0.1721 (13) Å, θ = 75.4 (4)° and φ = 186.9 (5)°] with a deviation for atoms O2 [0.1999 (12) Å] and C7 [0.0898 (9) Å] from the mean plane of the other four atoms. The two fused cyclohexenone rings adopt envelope conformations with puckering parameter (Cremer & Pople, 1975) Q = 0.4417 (15) Å, θ = 55.22 (19)° and φ = 116.4 (2)° for ring (C1-C6) and Q = 0.4715 (16) Å, θ = 59.08 (19)° and φ = 179.5 (2)° for ring (C8-C13). Atoms C3 and C11 are the flap atoms being situated out of the mean plane of the respective ring by 0.3118 (9) and 0.3324 (10) Å. The dihedral angle between the mean plane of the central pyran ring (O2/C5-C8/C13) and the difluorophenyl ring (C18-C23) is 87.55 (4)°.
In the crystal, molecules are linked by a pair of C-H···O hydrogen bonds (Fig. 2 and Table 1) forming inversion dimers with an R22(8) ring motif (Bernstein et al., 1995).