Literature DB >> 26870416

Crystal structure of 10a-hy-droxy-9-(3-nitro-phen-yl)-3,6-diphenyl-3,4,5,6,7,8a,9,10a-octa-hydro-1H-xanthene-1,8(2H)-dione.

Xin-Yuan Zhang1, Bing-Xiang Hu1, Ze-Yu Zhou1, Lei Zhou1, Fang-Ming Wang1.   

Abstract

In the octa-hydroxanthenedione unit of the title compound, C31H27NO6, the central di-hydro-pyran ring shows an envelope conformation, while the bilateral cyclo-hexene and cyclo-hexane rings adopt a half-boat conformation and a chair conformation, respectively. The nitro-benzene ring is twisted with respect to the two benzene rings, making dihedral angles of 63.1 (1) and 63.0 (1)°. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into supra-molecular chains propagating along the a-axis direction.

Entities:  

Keywords:  crystal structure; hydrogen bonding; xanthene

Year:  2015        PMID: 26870416      PMCID: PMC4719825          DOI: 10.1107/S2056989015021246

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

Xanthenes are important biologically active heterocyclic compounds, which possess anti-inflammatory, anti­bacterial and anti­viral activities (Shakibaei et al., 2007 ▸; Lambert et al., 1997 ▸). Many studies have been carried out on xanthene derivatives (Knight & Little, 2001 ▸; Jha & Beal, 2004 ▸; Lu et al., 2011 ▸; Cui et al., 2012 ▸; Wang et al., 2015 ▸). Herein, we report the synthesis and the crystal structure of the title xanthene deriv­ative.

Structural commentary

The mol­ecular structure of the title compound is shown in Fig. 1 ▸. The C1—O1 and C15—O2 bond lengths are 1.234 (4) and 1.202 (4) Å, respectively. The central di­hydro­pyran ring shows an envelope conformation with atom C19 as the flap, while the bilateral cyclo­hexene and cyclo­hexane rings adopt a half boat conformation and a chair conformation, respectively. The nitro­benzene ring is twisted with respect to the C7–C10 and C20–C25 benzene rings, making dihedral angles of 63.1 (1) and 63.0 (1)°, respectively.
Figure 1

The mol­ecular structure of the title compound, showing the atom labelling, with displacement ellipsoids drawn at the 50% probability level.

Supra­molecular features

In the crystal (Fig. 2 ▸), the mol­ecules are linked by O—H⋯O hydrogen bonds (Table 1 ▸), generating supra­molecular chains propagating along the a-axis direction.
Figure 2

Packing diagram showing the hydrogen bonds as dashed lines.

Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
O4—H4C⋯O1i 0.821.892.714 (3)180

Symmetry code: (i) .

Database survey

A search of the Cambridge Structural Database for 10a-hy­droxy-3,4,5,6,7,8a,9,10a-octa­hydro-1H-xanthene-1,8(2H)-dione gave 16 hits. None of them are substituted at the 3,6-position with two phenyl groups. Several compounds substituted at the 9-position with an aryl group are similar to the title compound, for example, 9-(2,6-di­chloro­phen­yl)-4a-hydroxy-3,3,6,6-tetra­methyl-1,2,3,4,4a,5,6,7,8,9a-deca­hydroxanthene-1,8-dione (Bolte et al., 2001 ▸), 9-(2,3-di­chloro­phen­yl)-4a-hy­droxy-3,3,6,6-tetra­methyl-3,4,4a,6,7,9,9a,10-octa­hydroanthracene-1,8(2H,5H)-dione (Mohammadi Ziarani et al., 2008 ▸) and 9-(2-chloro­phen­yl)-4a-hy­droxy-3,4,4a,5,6,7,9,9a-octa­hydro-1H-xanthracene-1,8(2H)-dione (Liu et al., 2014 ▸).

Synthesis and crystallization

The title compound was synthesized in accordance to our previous procedure (Wang et al., 2015 ▸). 5-Phenyl­cyclo­hexane-1,3-dione (7.52 g, 40 mmol) and 3-nitro­benzaldehyde (20 mmol) were dissolved in the mixture of methanol (10 ml) and ethanol (10 ml) in the presence of trace l-proline (5 mmol) and stirred for 4 h. After completion of the reaction, the white solid products were filtered under reduced pressure and washed with ethanol (78% yield). m.p. 445.15–447.15 K. IR (KBr pellets, cm−1): 3370 (O—H), 1648 (C=O), 1562 (C=C). MS (ESI) m/z: 510.2 [M + H+]. 1H NMR (DMSO-d 6, 400 MHz): δ 2.56–2.92 (m, 8H, 2a-H, 7a-H, 2b-H, 7b-H, 4a-H, 5a-H, 4b-H, 5b-H); 3.43 (m, 2H, 6-H, 3-H); 5.46 (m, 1H, 9-H); 7.14 (m, 2H, 11-H, 10-OH); 7.22–8.02 (m, 14H, PhH). Analysis calculated for C31H27NO6: C 73.07, H 5.34, N 2.75%; found: C 72.92, H 5.30, N 2.65%. Single crystals of the title compound were obtained by slow evaporation from an ethanol solution at room temperature in the form of colorless blocks.

Refinement details

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. All H atoms of were fixed geometrically and treated as riding with C—H = 0.97 (methyl­ene), 0.98 (methine), 0.93 (phen­yl) and O—H = 0.82 Å, with U iso(H) = 1.2U eq(C,O).
Table 2

Experimental details

Crystal data
Chemical formulaC31H27NO6
M r 509.53
Crystal system, space groupOrthorhombic, P212121
Temperature (K)291
a, b, c (Å)8.973 (4), 13.520 (6), 21.251 (9)
V3)2578 (2)
Z 4
Radiation typeMo Kα
μ (mm−1)0.09
Crystal size (mm)0.25 × 0.20 × 0.16
 
Data collection
DiffractometerBruker SMART APEXII area detector
Absorption correctionMulti-scan (SADABS; Bruker, 2000)
T min, T max 0.979, 0.986
No. of measured, independent and observed [I > 2σ(I)] reflections19805, 5040, 3978
R int 0.028
(sin θ/λ)max−1)0.617
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.044, 0.125, 1.03
No. of reflections5040
No. of parameters344
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.43, −0.21

Computer programs: APEX2 and SAINT (Bruker, 2000 ▸), SHELXS2014 (Sheldrick, 2008 ▸) and SHELXL2014 (Sheldrick, 2015 ▸).

Crystal structure: contains datablock(s) I, New_Global_Publ_Block. DOI: 10.1107/S2056989015021246/xu5879sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989015021246/xu5879Isup2.hkl Click here for additional data file. Supporting information file. DOI: 10.1107/S2056989015021246/xu5879Isup3.cml CCDC reference: 1435921 Additional supporting information: crystallographic information; 3D view; checkCIF report
C31H27NO6Dx = 1.313 Mg m3
Mr = 509.53Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, P212121Cell parameters from 7999 reflections
a = 8.973 (4) Åθ = 2.5–25.5°
b = 13.520 (6) ŵ = 0.09 mm1
c = 21.251 (9) ÅT = 291 K
V = 2578 (2) Å3Block, colorless
Z = 40.25 × 0.20 × 0.16 mm
F(000) = 1072
Bruker SMART APEXII area-detector diffractometer5040 independent reflections
Radiation source: sealed tube3978 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.028
φ and ω scansθmax = 26.0°, θmin = 2.4°
Absorption correction: multi-scan (SADABS; Bruker, 2000)h = −10→11
Tmin = 0.979, Tmax = 0.986k = −16→16
19805 measured reflectionsl = −26→26
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH-atom parameters constrained
R[F2 > 2σ(F2)] = 0.044w = 1/[σ2(Fo2) + (0.0674P)2 + 0.3283P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.125(Δ/σ)max = 0.010
S = 1.03Δρmax = 0.43 e Å3
5040 reflectionsΔρmin = −0.21 e Å3
344 parametersAbsolute structure: Flack x determined using 1503 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
0 restraintsAbsolute structure parameter: 1.3 (4)
Experimental. Least-squares planes (x,y,z in crystal coordinates) and deviations from them (* indicates atom used to define plane) 6.7298 (0.0116) x + 5.2391 (0.0295) y + 11.3904 (0.0347) z = 4.9647 (0.0106) * -0.0122 (0.0031) C20 * 0.0030 (0.0039) C21 * 0.0057 (0.0040) C22 * -0.0052 (0.0037) C23 * -0.0042 (0.0035) C24 * 0.0128 (0.0031) C25 Rms deviation of fitted atoms = 0.0081 5.3891 (0.0148) x - 9.6057 (0.0212) y - 7.7932 (0.0389) z = 1.2144 (0.0092) Angle to previous plane (with approximate esd) = 88.773 ( 14.5 ) * 0.0060 (0.0029) C7 * -0.0023 (0.0029) C8 * -0.0024 (0.0031) C9 * 0.0034 (0.0036) C10 * 0.0004 (0.0038) C11 * -0.0052 (0.0034) C12 Rms deviation of fitted atoms = 0.0038 - 1.0457 (0.0125) x + 0.3544 (0.0170) y + 21.0986 (0.0100) z = 0.3439 (0.0082) Angle to previous plane (with approximate esd) = 63.082 ( 14.2 ) * 0.0003 (0.0022) C26 * -0.0038 (0.0023) C27 * 0.0040 (0.0025) C28 * -0.0005 (0.0025) C29 * -0.0030 (0.0022) C30 * 0.0030 (0.0020) C31 Rms deviation of fitted atoms = 0.0028
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.
xyzUiso*/Ueq
C10.3896 (4)0.0908 (2)−0.07887 (14)0.0532 (7)
C20.3277 (3)0.09893 (19)−0.01590 (13)0.0444 (6)
C30.1786 (3)0.1037 (2)−0.00994 (13)0.0448 (6)
C40.0696 (3)0.0842 (2)−0.06132 (15)0.0537 (7)
H4A0.02060.1457−0.07250.064*
H4B−0.00610.0390−0.04600.064*
C50.1411 (4)0.0405 (3)−0.11952 (16)0.0699 (10)
H5A0.1651−0.0280−0.10840.084*
C60.2850 (4)0.0872 (3)−0.13382 (17)0.0749 (10)
H6A0.26720.1541−0.14840.090*
H6B0.33230.0511−0.16780.090*
C70.0334 (4)0.0332 (3)−0.17443 (15)0.0657 (9)
C80.0491 (5)0.0871 (3)−0.22896 (16)0.0795 (12)
H8A0.12540.1333−0.23240.095*
C9−0.0483 (8)0.0729 (4)−0.27876 (19)0.1001 (17)
H9A−0.03650.1097−0.31540.120*
C10−0.1603 (7)0.0061 (5)−0.2747 (2)0.109 (2)
H10A−0.2248−0.0033−0.30840.131*
C11−0.1778 (6)−0.0470 (5)−0.2208 (3)0.1080 (17)
H11A−0.2546−0.0929−0.21760.130*
C12−0.0816 (5)−0.0329 (4)−0.1710 (2)0.0873 (13)
H12A−0.0952−0.0692−0.13420.105*
C130.4348 (3)0.1112 (2)0.03895 (13)0.0448 (6)
H13A0.48970.17310.03290.054*
C140.3463 (3)0.1195 (2)0.10028 (13)0.0454 (6)
H14A0.31830.05250.11330.054*
C150.4323 (4)0.1669 (2)0.15441 (14)0.0502 (7)
C160.3445 (4)0.1767 (3)0.21452 (15)0.0594 (8)
H16A0.40400.21170.24550.071*
H16B0.32300.11140.23100.071*
C170.1982 (4)0.2325 (2)0.20407 (14)0.0531 (7)
H17A0.22390.29960.19050.064*
C180.1095 (4)0.1841 (2)0.15049 (13)0.0500 (7)
H18A0.07950.11800.16290.060*
H18B0.02020.22230.14220.060*
C190.2036 (3)0.1785 (2)0.09110 (13)0.0477 (7)
C200.1030 (4)0.2418 (3)0.26275 (14)0.0583 (8)
C210.0884 (7)0.1681 (4)0.3066 (2)0.0987 (15)
H21A0.14300.11010.30180.118*
C22−0.0045 (7)0.1777 (5)0.3573 (2)0.1152 (18)
H22A−0.01200.12630.38620.138*
C23−0.0851 (5)0.2603 (6)0.3660 (2)0.1031 (18)
H23A−0.14890.26610.40030.124*
C24−0.0718 (6)0.3356 (5)0.3235 (2)0.1023 (17)
H24A−0.12720.39310.32890.123*
C250.0237 (5)0.3272 (3)0.27247 (18)0.0790 (11)
H25A0.03410.37980.24460.095*
C260.5470 (3)0.0276 (2)0.04296 (13)0.0469 (7)
C270.6988 (3)0.0467 (3)0.04997 (15)0.0556 (8)
H27A0.73240.11170.05020.067*
C280.7995 (4)−0.0294 (3)0.05661 (17)0.0660 (9)
H28A0.9002−0.01500.06170.079*
C290.7535 (4)−0.1262 (3)0.05574 (17)0.0654 (9)
H29A0.8214−0.17770.05990.079*
C300.6046 (4)−0.1444 (2)0.04855 (14)0.0538 (7)
C310.4998 (3)−0.0703 (2)0.04240 (14)0.0484 (7)
H31A0.3993−0.08560.03790.058*
N10.5518 (4)−0.2479 (2)0.04813 (15)0.0718 (8)
O10.5249 (2)0.09640 (17)−0.08882 (11)0.0611 (6)
O20.5583 (3)0.19545 (18)0.14823 (11)0.0635 (6)
O30.1096 (2)0.12872 (16)0.04468 (9)0.0519 (5)
O40.2463 (2)0.27061 (15)0.06846 (10)0.0537 (5)
H4C0.17920.31060.07460.081*
O50.6420 (4)−0.3133 (2)0.03810 (18)0.1123 (12)
O60.4215 (4)−0.2637 (2)0.0582 (2)0.1056 (11)
U11U22U33U12U13U23
C10.0563 (18)0.0513 (17)0.0522 (17)−0.0012 (15)0.0112 (15)−0.0060 (14)
C20.0519 (17)0.0372 (14)0.0441 (14)0.0000 (12)0.0036 (13)0.0003 (12)
C30.0515 (16)0.0427 (15)0.0402 (14)−0.0003 (12)0.0023 (12)−0.0001 (12)
C40.0528 (17)0.0608 (18)0.0476 (16)0.0010 (15)−0.0005 (13)−0.0023 (14)
C50.064 (2)0.098 (3)0.0475 (18)−0.0060 (19)−0.0007 (16)0.0034 (18)
C60.075 (2)0.098 (3)0.0523 (19)−0.001 (2)0.0060 (17)−0.0111 (19)
C70.072 (2)0.085 (2)0.0401 (16)0.014 (2)0.0003 (16)−0.0048 (17)
C80.116 (3)0.076 (2)0.0467 (19)0.015 (2)−0.009 (2)−0.0058 (17)
C90.152 (5)0.103 (3)0.046 (2)0.049 (4)−0.020 (3)−0.011 (2)
C100.122 (4)0.138 (5)0.067 (3)0.039 (4)−0.037 (3)−0.037 (3)
C110.087 (3)0.148 (5)0.088 (3)−0.010 (3)−0.019 (3)−0.028 (3)
C120.076 (3)0.126 (4)0.060 (2)−0.011 (3)−0.008 (2)0.000 (2)
C130.0469 (15)0.0406 (14)0.0468 (15)−0.0042 (12)0.0022 (12)−0.0013 (12)
C140.0508 (16)0.0393 (14)0.0461 (15)−0.0014 (13)0.0015 (12)0.0004 (12)
C150.0555 (19)0.0452 (16)0.0499 (16)0.0099 (15)−0.0032 (14)0.0003 (13)
C160.068 (2)0.0623 (19)0.0475 (17)0.0058 (17)−0.0025 (15)−0.0006 (15)
C170.0623 (19)0.0505 (16)0.0464 (16)0.0015 (15)0.0059 (14)−0.0012 (13)
C180.0537 (16)0.0511 (16)0.0451 (15)0.0001 (14)0.0066 (14)0.0009 (13)
C190.0478 (15)0.0505 (16)0.0448 (15)0.0019 (13)0.0008 (12)−0.0022 (13)
C200.0622 (19)0.068 (2)0.0450 (16)−0.0021 (18)−0.0014 (15)−0.0082 (15)
C210.136 (4)0.082 (3)0.078 (3)0.008 (3)0.043 (3)0.011 (2)
C220.132 (5)0.132 (5)0.082 (3)−0.014 (4)0.038 (3)0.015 (3)
C230.068 (3)0.183 (6)0.058 (3)−0.013 (3)0.014 (2)−0.030 (3)
C240.085 (3)0.144 (5)0.078 (3)0.033 (3)0.006 (3)−0.032 (3)
C250.081 (3)0.096 (3)0.060 (2)0.025 (2)0.0047 (19)−0.009 (2)
C260.0509 (16)0.0467 (15)0.0430 (14)−0.0013 (13)0.0070 (13)0.0006 (12)
C270.0506 (17)0.0625 (19)0.0538 (18)−0.0055 (15)0.0042 (14)0.0030 (15)
C280.0467 (17)0.083 (2)0.068 (2)0.0033 (17)0.0045 (16)0.0026 (18)
C290.063 (2)0.069 (2)0.064 (2)0.0190 (18)0.0052 (17)0.0072 (16)
C300.067 (2)0.0470 (16)0.0469 (15)0.0042 (14)0.0035 (15)0.0039 (13)
C310.0508 (16)0.0501 (16)0.0444 (14)0.0012 (13)0.0013 (13)0.0014 (12)
N10.095 (2)0.0502 (17)0.0700 (18)0.0082 (18)0.0015 (18)0.0109 (14)
O10.0579 (13)0.0663 (14)0.0591 (13)−0.0065 (11)0.0139 (10)−0.0047 (10)
O20.0595 (14)0.0683 (15)0.0627 (14)−0.0025 (12)−0.0050 (11)−0.0077 (11)
O30.0455 (10)0.0657 (13)0.0444 (10)−0.0024 (10)0.0029 (9)−0.0066 (9)
O40.0587 (12)0.0471 (11)0.0554 (12)0.0045 (10)0.0076 (10)0.0075 (9)
O50.139 (3)0.0557 (16)0.142 (3)0.0285 (18)0.020 (2)0.0107 (18)
O60.097 (2)0.0608 (16)0.159 (3)−0.0136 (16)−0.007 (2)0.0041 (18)
C1—O11.234 (4)C16—H16A0.9700
C1—C21.453 (4)C16—H16B0.9700
C1—C61.499 (5)C17—C201.517 (4)
C2—C31.345 (4)C17—C181.536 (4)
C2—C131.520 (4)C17—H17A0.9800
C3—O31.358 (3)C18—C191.520 (4)
C3—C41.489 (4)C18—H18A0.9700
C4—C51.513 (5)C18—H18B0.9700
C4—H4A0.9700C19—O41.389 (4)
C4—H4B0.9700C19—O31.462 (4)
C5—C61.468 (5)C20—C211.371 (5)
C5—C71.519 (5)C20—C251.371 (5)
C5—H5A0.9800C21—C221.369 (7)
C6—H6A0.9700C21—H21A0.9300
C6—H6B0.9700C22—C231.343 (8)
C7—C121.367 (6)C22—H22A0.9300
C7—C81.376 (5)C23—C241.365 (9)
C8—C91.385 (6)C23—H23A0.9300
C8—H8A0.9300C24—C251.387 (6)
C9—C101.354 (8)C24—H24A0.9300
C9—H9A0.9300C25—H25A0.9300
C10—C111.360 (8)C26—C311.390 (4)
C10—H10A0.9300C26—C271.394 (4)
C11—C121.380 (6)C27—C281.377 (5)
C11—H11A0.9300C27—H27A0.9300
C12—H12A0.9300C28—C291.373 (6)
C13—C261.515 (4)C28—H28A0.9300
C13—C141.530 (4)C29—C301.366 (5)
C13—H13A0.9800C29—H29A0.9300
C14—C191.521 (4)C30—C311.380 (4)
C14—C151.527 (4)C30—N11.477 (5)
C14—H14A0.9800C31—H31A0.9300
C15—O21.202 (4)N1—O61.207 (4)
C15—C161.507 (5)N1—O51.218 (4)
C16—C171.530 (5)O4—H4C0.8200
O1—C1—C2121.9 (3)C15—C16—H16B109.3
O1—C1—C6119.0 (3)C17—C16—H16B109.3
C2—C1—C6118.7 (3)H16A—C16—H16B108.0
C3—C2—C1118.1 (3)C20—C17—C16113.9 (3)
C3—C2—C13123.5 (3)C20—C17—C18110.7 (3)
C1—C2—C13118.2 (3)C16—C17—C18110.0 (3)
C2—C3—O3123.1 (3)C20—C17—H17A107.3
C2—C3—C4125.1 (3)C16—C17—H17A107.3
O3—C3—C4111.8 (2)C18—C17—H17A107.3
C3—C4—C5112.9 (3)C19—C18—C17110.4 (2)
C3—C4—H4A109.0C19—C18—H18A109.6
C5—C4—H4A109.0C17—C18—H18A109.6
C3—C4—H4B109.0C19—C18—H18B109.6
C5—C4—H4B109.0C17—C18—H18B109.6
H4A—C4—H4B107.8H18A—C18—H18B108.1
C6—C5—C4112.0 (3)O4—C19—O3109.8 (2)
C6—C5—C7115.4 (3)O4—C19—C18113.4 (2)
C4—C5—C7112.5 (3)O3—C19—C18105.2 (2)
C6—C5—H5A105.3O4—C19—C14106.4 (2)
C4—C5—H5A105.3O3—C19—C14109.3 (2)
C7—C5—H5A105.3C18—C19—C14112.8 (2)
C5—C6—C1113.8 (3)C21—C20—C25117.4 (3)
C5—C6—H6A108.8C21—C20—C17123.5 (3)
C1—C6—H6A108.8C25—C20—C17119.1 (3)
C5—C6—H6B108.8C22—C21—C20121.6 (5)
C1—C6—H6B108.8C22—C21—H21A119.2
H6A—C6—H6B107.7C20—C21—H21A119.2
C12—C7—C8118.0 (4)C23—C22—C21121.0 (5)
C12—C7—C5118.8 (3)C23—C22—H22A119.5
C8—C7—C5123.2 (4)C21—C22—H22A119.5
C7—C8—C9120.4 (5)C22—C23—C24118.8 (4)
C7—C8—H8A119.8C22—C23—H23A120.6
C9—C8—H8A119.8C24—C23—H23A120.6
C10—C9—C8120.8 (5)C23—C24—C25120.7 (5)
C10—C9—H9A119.6C23—C24—H24A119.7
C8—C9—H9A119.6C25—C24—H24A119.7
C9—C10—C11119.4 (5)C20—C25—C24120.4 (5)
C9—C10—H10A120.3C20—C25—H25A119.8
C11—C10—H10A120.3C24—C25—H25A119.8
C10—C11—C12120.1 (6)C31—C26—C27118.3 (3)
C10—C11—H11A120.0C31—C26—C13120.5 (3)
C12—C11—H11A120.0C27—C26—C13121.2 (3)
C7—C12—C11121.4 (5)C28—C27—C26121.0 (3)
C7—C12—H12A119.3C28—C27—H27A119.5
C11—C12—H12A119.3C26—C27—H27A119.5
C26—C13—C2112.5 (2)C29—C28—C27120.9 (3)
C26—C13—C14110.6 (2)C29—C28—H28A119.6
C2—C13—C14109.4 (2)C27—C28—H28A119.6
C26—C13—H13A108.1C30—C29—C28117.9 (3)
C2—C13—H13A108.1C30—C29—H29A121.1
C14—C13—H13A108.1C28—C29—H29A121.1
C19—C14—C15107.6 (2)C29—C30—C31123.0 (3)
C19—C14—C13111.5 (2)C29—C30—N1119.0 (3)
C15—C14—C13114.2 (2)C31—C30—N1117.9 (3)
C19—C14—H14A107.8C30—C31—C26118.9 (3)
C15—C14—H14A107.8C30—C31—H31A120.5
C13—C14—H14A107.8C26—C31—H31A120.5
O2—C15—C16123.8 (3)O6—N1—O5123.1 (4)
O2—C15—C14121.9 (3)O6—N1—C30118.5 (3)
C16—C15—C14114.3 (3)O5—N1—C30118.4 (4)
C15—C16—C17111.7 (3)C3—O3—C19115.4 (2)
C15—C16—H16A109.3C19—O4—H4C109.5
C17—C16—H16A109.3
O1—C1—C2—C3172.3 (3)C16—C17—C18—C19−55.4 (3)
C6—C1—C2—C3−0.5 (4)C17—C18—C19—O4−61.8 (3)
O1—C1—C2—C13−2.1 (4)C17—C18—C19—O3178.2 (2)
C6—C1—C2—C13−175.0 (3)C17—C18—C19—C1459.2 (3)
C1—C2—C3—O3−168.0 (2)C15—C14—C19—O468.2 (3)
C13—C2—C3—O36.1 (4)C13—C14—C19—O4−57.8 (3)
C1—C2—C3—C411.1 (4)C15—C14—C19—O3−173.4 (2)
C13—C2—C3—C4−174.8 (3)C13—C14—C19—O360.6 (3)
C2—C3—C4—C510.0 (4)C15—C14—C19—C18−56.7 (3)
O3—C3—C4—C5−170.8 (3)C13—C14—C19—C18177.3 (2)
C3—C4—C5—C6−40.7 (4)C16—C17—C20—C21−38.2 (5)
C3—C4—C5—C7−172.6 (3)C18—C17—C20—C2186.3 (5)
C4—C5—C6—C151.0 (5)C16—C17—C20—C25143.3 (3)
C7—C5—C6—C1−178.6 (3)C18—C17—C20—C25−92.1 (4)
O1—C1—C6—C5155.9 (4)C25—C20—C21—C221.8 (8)
C2—C1—C6—C5−31.1 (5)C17—C20—C21—C22−176.7 (4)
C6—C5—C7—C12161.1 (4)C20—C21—C22—C23−0.1 (9)
C4—C5—C7—C12−68.7 (5)C21—C22—C23—C24−0.7 (9)
C6—C5—C7—C8−16.1 (6)C22—C23—C24—C25−0.2 (8)
C4—C5—C7—C8114.1 (4)C21—C20—C25—C24−2.7 (6)
C12—C7—C8—C9−0.9 (6)C17—C20—C25—C24175.9 (4)
C5—C7—C8—C9176.3 (4)C23—C24—C25—C202.0 (7)
C7—C8—C9—C100.1 (6)C2—C13—C26—C31−51.4 (3)
C8—C9—C10—C110.4 (7)C14—C13—C26—C3171.3 (3)
C9—C10—C11—C12−0.2 (8)C2—C13—C26—C27131.3 (3)
C8—C7—C12—C111.2 (7)C14—C13—C26—C27−106.0 (3)
C5—C7—C12—C11−176.2 (4)C31—C26—C27—C28−0.4 (5)
C10—C11—C12—C7−0.7 (8)C13—C26—C27—C28176.9 (3)
C3—C2—C13—C26128.5 (3)C26—C27—C28—C290.8 (5)
C1—C2—C13—C26−57.3 (3)C27—C28—C29—C30−0.5 (5)
C3—C2—C13—C145.2 (4)C28—C29—C30—C31−0.2 (5)
C1—C2—C13—C14179.3 (2)C28—C29—C30—N1−179.3 (3)
C26—C13—C14—C19−162.0 (2)C29—C30—C31—C260.6 (5)
C2—C13—C14—C19−37.5 (3)N1—C30—C31—C26179.7 (3)
C26—C13—C14—C1575.8 (3)C27—C26—C31—C30−0.2 (4)
C2—C13—C14—C15−159.8 (2)C13—C26—C31—C30−177.5 (3)
C19—C14—C15—O2−123.8 (3)C29—C30—N1—O6161.0 (4)
C13—C14—C15—O20.6 (4)C31—C30—N1—O6−18.2 (5)
C19—C14—C15—C1654.7 (3)C29—C30—N1—O5−18.4 (5)
C13—C14—C15—C16179.0 (2)C31—C30—N1—O5162.4 (3)
O2—C15—C16—C17123.6 (3)C2—C3—O3—C1917.6 (4)
C14—C15—C16—C17−54.8 (4)C4—C3—O3—C19−161.6 (2)
C15—C16—C17—C20178.2 (3)O4—C19—O3—C366.2 (3)
C15—C16—C17—C1853.3 (4)C18—C19—O3—C3−171.5 (2)
C20—C17—C18—C19177.8 (3)C14—C19—O3—C3−50.2 (3)
D—H···AD—HH···AD···AD—H···A
O4—H4C···O1i0.821.892.714 (3)180
  6 in total

1.  Two diastereomers of 9-(2,6-dichlorophenyl)-4a-hydroxy-3,3,6,6-tetramethyl-1,2,3,4,4a,5,6,7,8,9a-decahydroxanthene-1,8-dione in the same crystal.

Authors:  M Bolte; A Degen; S Rühl
Journal:  Acta Crystallogr C       Date:  2001-04       Impact factor: 1.172

2.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

3.  9-(2,3-Dichloro-phen-yl)-4a-hydr-oxy-3,3,6,6-tetra-methyl-4,4a,5,6,9,9a-hexa-hydro-3H-xanthene-1,8(2H,7H)-dione.

Authors:  Ghodsi Mohammadi Ziarani; Alireza Abbasi; Alireza Badiei; Mahboubeh Haddadpour; Ali Abdi Jahangir
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2008-01-25

4.  14-Methoxy-2,16-dioxapentacyclo[7.7.5.0.0.0]henicosa-3(8),10,12,14-tetraene-7,20-dione.

Authors:  Weicheng Lu; Chaomei Lian; Yan Yang; Yulin Zhu
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-07-23

5.  Crystal structure refinement with SHELXL.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr C Struct Chem       Date:  2015-01-01       Impact factor: 1.172

6.  9-(2-Chloro-phen-yl)-4a-hy-droxy-3,4,4a,5,6,7,9,9a-octa-hydro-2H-xanthene-1,8-dione.

Authors:  Qiu-Ling Liu; Xin-Yan Wu; Feng Gao; Dan Bao; Fang-Ming Wang
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2014-03-15
  6 in total

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