organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 2056-9890

2,6-Bis(2,4-di­chloro­benzyl­­idene)cyclo­hexa­none

aMicroscale Science Institute, Department of Chemistry and Chemical Engineering, Weifang University, Weifang 261061, People's Republic of China
*Correspondence e-mail: ffjian2008@163.com

(Received 10 July 2008; accepted 22 July 2008; online 31 July 2008)

The title compound, C20H14Cl4O, was prepared from a mixture of 2,4-dichloro­benzophenone and cyclo­hexa­none. The dihedral angles formed by the cyclohexane ring and two benzene rings are 39.18 (2) and 60.72 (2)°. There are some weak intra­molecular C—H⋯O and C—H⋯Cl hydrogen-bond contacts in the crystal structure.

Related literature

For related literature, see: Butcher et al. (2006[Butcher, R. J., Yathirajan, H. S., Sarojini, B. K., Narayana, B. & Indira, J. (2006). Acta Cryst. E62, o1910-o1912.]); Deli et al. (1984[Deli, J., Lorand, T., Szabo, D. & Foldesi, A. (1984). Pharmazie, 39, 539-544.]); Jia et al. (1989[Jia, Z., Quail, J. W., Arora, V. K. & Dimmock, J. R. (1989). Acta Cryst. C45, 285-289.]); Yu et al. (2000[Yu, R. C., Yakimansky, A. V., Kothe, H., Voigt-Martin, I. G., Schollmeyer, D., Jansen, J., Zandbergen, H. & Tenkovtsev, A. V. (2000). Acta Cryst. A56, 436-450.]).

[Scheme 1]

Experimental

Crystal data
  • C20H14Cl4O

  • Mr = 412.11

  • Orthorhombic, P b c a

  • a = 14.469 (2) Å

  • b = 8.0602 (12) Å

  • c = 31.554 (4) Å

  • V = 3679.9 (9) Å3

  • Z = 8

  • Mo Kα radiation

  • μ = 0.65 mm−1

  • T = 293 (2) K

  • 0.20 × 0.15 × 0.10 mm

Data collection
  • Bruker SMART CCD area-detector diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 1997[Bruker (1997). SADABS, SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.881, Tmax = 0.938

  • 21985 measured reflections

  • 4570 independent reflections

  • 2735 reflections with I > 2σ(I)

  • Rint = 0.053

Refinement
  • R[F2 > 2σ(F2)] = 0.050

  • wR(F2) = 0.118

  • S = 1.03

  • 4570 reflections

  • 226 parameters

  • H-atom parameters constrained

  • Δρmax = 0.24 e Å−3

  • Δρmin = −0.28 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
C7—H7A⋯Cl2 0.93 2.74 3.055 (2) 101
C7—H7A⋯O1 0.93 2.33 2.732 (3) 105
C14—H14A⋯O1 0.93 2.39 2.759 (3) 103

Data collection: SMART (Bruker, 1997[Bruker (1997). SADABS, SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 1997[Bruker (1997). SADABS, SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); software used to prepare material for publication: SHELXTL.

Supporting information


Comment top

As useful precursors to potentially bioactive pyrimidine derivatives, a,a-bis(substituted benzylidene) cycloalkanones have attracted considerable attention for many years (Deli et al., 1984). In recent years, a series of non-linear optically active bis(benzylidene) ketones have been synthesized (Yu et al., 2000). As part of our search for new non-linear optically active compounds, we synthesized the title compound (I), and describe its structure here.

In the structure of (I) (Fig. 1), all of the bond lengthes and bond angles fall in the normal range (Yu et al., 2000; Jia et al., 1989; Butcher et al., 2006). There are some weak C—H···O and C—H···Cl intramolecular hydrogen bonds in the crystal structure.

Related literature top

For related literature, see: Butcher et al. (2006); Deli et al. (1984); Jia et al. (1989); Yu et al. (2000).

Experimental top

A mixture of the 2,4-dichlorobenzophenone (0.2 mol), and cyclohexanone (0.1 mol) and 10% NaOH (10 ml) was stirred in ethanol (30 mL) for 5 h to afford the title compound [yield: 82%]. Single crystals suitable for X-ray measurements were obtained by recrystallization from ethanol at room temperature.

Refinement top

H atoms were fixed geometrically and allowed to ride on their attached atoms, with C—H = 0.93–0.97 Å, and with Uiso(H) = 1.2Ueq(C).

Computing details top

Data collection: SMART (Bruker, 1997); cell refinement: SMART (Bruker, 1997); data reduction: SAINT (Bruker, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The structure of the title compound, showing 30% probability displacement ellipsoids and the atom-numbering scheme.
2,6-Bis(2,4-dichlorobenzylidene)cyclohexanone top
Crystal data top
C20H14Cl4OZ = 8
Mr = 412.11F(000) = 1680
Orthorhombic, PbcaDx = 1.488 Mg m3
Hall symbol: -P 2ac 2abMo Kα radiation, λ = 0.71073 Å
a = 14.469 (2) ŵ = 0.65 mm1
b = 8.0602 (12) ÅT = 293 K
c = 31.554 (4) ÅBar, yellow
V = 3679.9 (9) Å30.20 × 0.15 × 0.10 mm
Data collection top
Bruker SMART CCD area-detector
diffractometer
4570 independent reflections
Radiation source: fine-focus sealed tube2735 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.053
ϕ and ω scansθmax = 28.4°, θmin = 1.3°
Absorption correction: multi-scan
(SADABS; Bruker, 1997)
h = 1918
Tmin = 0.881, Tmax = 0.938k = 1010
21985 measured reflectionsl = 1942
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.050Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.118H-atom parameters constrained
S = 1.03 w = 1/[σ2(Fo2) + (0.0381P)2 + 1.6278P]
where P = (Fo2 + 2Fc2)/3
4570 reflections(Δ/σ)max = 0.001
226 parametersΔρmax = 0.24 e Å3
0 restraintsΔρmin = 0.28 e Å3
Crystal data top
C20H14Cl4OV = 3679.9 (9) Å3
Mr = 412.11Z = 8
Orthorhombic, PbcaMo Kα radiation
a = 14.469 (2) ŵ = 0.65 mm1
b = 8.0602 (12) ÅT = 293 K
c = 31.554 (4) Å0.20 × 0.15 × 0.10 mm
Data collection top
Bruker SMART CCD area-detector
diffractometer
4570 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 1997)
2735 reflections with I > 2σ(I)
Tmin = 0.881, Tmax = 0.938Rint = 0.053
21985 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0500 restraints
wR(F2) = 0.118H-atom parameters constrained
S = 1.03Δρmax = 0.24 e Å3
4570 reflectionsΔρmin = 0.28 e Å3
226 parameters
Special details top

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.

Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Cl10.37152 (7)0.07869 (15)0.49524 (3)0.1044 (4)
Cl20.51233 (4)0.04759 (9)0.33808 (2)0.05594 (19)
Cl30.06595 (6)0.60906 (12)0.04572 (3)0.0852 (3)
Cl40.21635 (6)0.20911 (12)0.08713 (2)0.0825 (3)
O10.36351 (10)0.3253 (2)0.22630 (5)0.0557 (5)
C10.42738 (15)0.1234 (3)0.37207 (8)0.0468 (6)
C20.43315 (18)0.0787 (4)0.41435 (8)0.0578 (7)
H2A0.48040.00980.42380.069*
C30.36783 (19)0.1381 (4)0.44228 (9)0.0635 (8)
C40.29917 (19)0.2442 (4)0.42879 (9)0.0663 (8)
H4A0.25720.28810.44810.080*
C50.29343 (17)0.2844 (4)0.38653 (9)0.0592 (7)
H5A0.24650.35500.37760.071*
C60.35581 (16)0.2229 (3)0.35643 (8)0.0466 (6)
C70.34846 (15)0.2620 (3)0.31106 (8)0.0461 (6)
H7A0.40410.27520.29670.055*
C80.27162 (14)0.2811 (3)0.28761 (8)0.0419 (6)
C90.17413 (14)0.2600 (3)0.30424 (8)0.0499 (6)
H9A0.15710.35810.32020.060*
H9B0.17270.16610.32350.060*
C100.10328 (15)0.2324 (3)0.26939 (8)0.0502 (6)
H10A0.11420.12610.25590.060*
H10B0.04170.23100.28150.060*
C110.11002 (15)0.3693 (3)0.23677 (8)0.0457 (6)
H11A0.06120.35630.21600.055*
H11B0.10200.47600.25050.055*
C120.20266 (14)0.3642 (3)0.21491 (8)0.0412 (5)
C130.28552 (15)0.3230 (3)0.24158 (7)0.0423 (6)
C140.21556 (16)0.3858 (3)0.17333 (8)0.0466 (6)
H14A0.27510.36800.16320.056*
C150.14545 (15)0.4349 (3)0.14198 (8)0.0443 (6)
C160.08247 (16)0.5614 (3)0.15088 (8)0.0512 (6)
H16A0.08400.61120.17750.061*
C170.01834 (18)0.6150 (3)0.12186 (8)0.0554 (7)
H17A0.02270.69950.12880.067*
C180.01524 (17)0.5426 (3)0.08242 (8)0.0539 (7)
C190.07653 (18)0.4177 (3)0.07173 (8)0.0555 (7)
H19A0.07460.36910.04500.067*
C200.14056 (17)0.3665 (3)0.10137 (8)0.0490 (6)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cl10.1071 (7)0.1580 (10)0.0482 (5)0.0068 (7)0.0000 (5)0.0108 (5)
Cl20.0381 (3)0.0687 (4)0.0610 (4)0.0027 (3)0.0010 (3)0.0002 (3)
Cl30.0747 (5)0.1149 (7)0.0660 (5)0.0291 (5)0.0131 (4)0.0144 (5)
Cl40.0959 (6)0.0945 (6)0.0572 (5)0.0482 (5)0.0024 (4)0.0122 (4)
O10.0313 (9)0.0847 (14)0.0509 (10)0.0009 (8)0.0073 (8)0.0041 (10)
C10.0355 (13)0.0554 (16)0.0497 (15)0.0080 (11)0.0013 (11)0.0045 (12)
C20.0506 (16)0.0682 (19)0.0546 (17)0.0054 (13)0.0080 (13)0.0023 (14)
C30.0559 (17)0.090 (2)0.0445 (15)0.0099 (16)0.0043 (14)0.0017 (15)
C40.0524 (16)0.093 (2)0.0531 (17)0.0033 (16)0.0063 (14)0.0141 (16)
C50.0459 (15)0.077 (2)0.0549 (17)0.0076 (13)0.0001 (13)0.0080 (15)
C60.0355 (12)0.0555 (15)0.0488 (15)0.0069 (11)0.0019 (11)0.0027 (12)
C70.0335 (12)0.0547 (15)0.0501 (15)0.0002 (10)0.0026 (11)0.0034 (12)
C80.0331 (12)0.0459 (14)0.0468 (14)0.0012 (10)0.0041 (10)0.0056 (11)
C90.0331 (12)0.0648 (17)0.0517 (15)0.0026 (11)0.0061 (11)0.0020 (13)
C100.0318 (12)0.0576 (16)0.0612 (16)0.0049 (11)0.0045 (12)0.0007 (13)
C110.0316 (12)0.0537 (15)0.0518 (15)0.0006 (11)0.0006 (11)0.0023 (12)
C120.0327 (12)0.0436 (14)0.0473 (14)0.0007 (10)0.0024 (11)0.0048 (11)
C130.0331 (12)0.0458 (14)0.0481 (14)0.0018 (10)0.0034 (11)0.0096 (11)
C140.0340 (12)0.0552 (15)0.0507 (15)0.0003 (11)0.0016 (11)0.0050 (12)
C150.0370 (12)0.0527 (15)0.0431 (14)0.0021 (11)0.0027 (11)0.0019 (12)
C160.0490 (14)0.0575 (16)0.0471 (15)0.0007 (12)0.0020 (12)0.0047 (13)
C170.0513 (15)0.0566 (17)0.0583 (17)0.0101 (13)0.0042 (13)0.0005 (14)
C180.0484 (14)0.0633 (17)0.0499 (16)0.0018 (13)0.0033 (12)0.0111 (14)
C190.0629 (17)0.0642 (18)0.0393 (14)0.0059 (14)0.0008 (12)0.0001 (13)
C200.0487 (14)0.0513 (16)0.0469 (15)0.0062 (12)0.0052 (12)0.0013 (12)
Geometric parameters (Å, º) top
Cl1—C31.739 (3)C9—H9B0.9700
Cl2—C11.742 (2)C10—C111.512 (3)
Cl3—C181.735 (3)C10—H10A0.9700
Cl4—C201.736 (3)C10—H10B0.9700
O1—C131.227 (2)C11—C121.508 (3)
C1—C21.384 (3)C11—H11A0.9700
C1—C61.400 (3)C11—H11B0.9700
C2—C31.378 (4)C12—C141.337 (3)
C2—H2A0.9300C12—C131.502 (3)
C3—C41.378 (4)C14—C151.471 (3)
C4—C51.375 (4)C14—H14A0.9300
C4—H4A0.9300C15—C161.396 (3)
C5—C61.401 (3)C15—C201.397 (3)
C5—H5A0.9300C16—C171.373 (3)
C6—C71.470 (3)C16—H16A0.9300
C7—C81.345 (3)C17—C181.375 (4)
C7—H7A0.9300C17—H17A0.9300
C8—C131.504 (3)C18—C191.383 (4)
C8—C91.515 (3)C19—C201.380 (3)
C9—C101.520 (3)C19—H19A0.9300
C9—H9A0.9700
C2—C1—C6122.2 (2)H10A—C10—H10B108.2
C2—C1—Cl2117.4 (2)C12—C11—C10110.4 (2)
C6—C1—Cl2120.4 (2)C12—C11—H11A109.6
C3—C2—C1119.0 (3)C10—C11—H11A109.6
C3—C2—H2A120.5C12—C11—H11B109.6
C1—C2—H2A120.5C10—C11—H11B109.6
C2—C3—C4120.8 (3)H11A—C11—H11B108.1
C2—C3—Cl1119.9 (2)C14—C12—C13117.9 (2)
C4—C3—Cl1119.3 (2)C14—C12—C11124.7 (2)
C5—C4—C3119.3 (3)C13—C12—C11117.3 (2)
C5—C4—H4A120.3O1—C13—C12120.7 (2)
C3—C4—H4A120.3O1—C13—C8120.4 (2)
C4—C5—C6122.4 (3)C12—C13—C8118.93 (19)
C4—C5—H5A118.8C12—C14—C15126.8 (2)
C6—C5—H5A118.8C12—C14—H14A116.6
C1—C6—C5116.1 (2)C15—C14—H14A116.6
C1—C6—C7121.3 (2)C16—C15—C20116.1 (2)
C5—C6—C7122.5 (2)C16—C15—C14120.7 (2)
C8—C7—C6128.4 (2)C20—C15—C14123.1 (2)
C8—C7—H7A115.8C17—C16—C15122.5 (2)
C6—C7—H7A115.8C17—C16—H16A118.8
C7—C8—C13116.5 (2)C15—C16—H16A118.8
C7—C8—C9124.5 (2)C16—C17—C18119.5 (2)
C13—C8—C9118.96 (19)C16—C17—H17A120.3
C8—C9—C10113.2 (2)C18—C17—H17A120.3
C8—C9—H9A108.9C17—C18—C19120.6 (2)
C10—C9—H9A108.9C17—C18—Cl3119.7 (2)
C8—C9—H9B108.9C19—C18—Cl3119.8 (2)
C10—C9—H9B108.9C20—C19—C18118.9 (2)
H9A—C9—H9B107.8C20—C19—H19A120.6
C11—C10—C9110.0 (2)C18—C19—H19A120.6
C11—C10—H10A109.7C19—C20—C15122.5 (2)
C9—C10—H10A109.7C19—C20—Cl4117.9 (2)
C11—C10—H10B109.7C15—C20—Cl4119.59 (19)
C9—C10—H10B109.7
C6—C1—C2—C31.9 (4)C11—C12—C13—O1176.1 (2)
Cl2—C1—C2—C3179.2 (2)C14—C12—C13—C8173.9 (2)
C1—C2—C3—C41.9 (4)C11—C12—C13—C83.0 (3)
C1—C2—C3—Cl1178.0 (2)C7—C8—C13—O15.7 (3)
C2—C3—C4—C53.2 (4)C9—C8—C13—O1173.0 (2)
Cl1—C3—C4—C5176.7 (2)C7—C8—C13—C12173.4 (2)
C3—C4—C5—C60.8 (4)C9—C8—C13—C127.9 (3)
C2—C1—C6—C54.1 (4)C13—C12—C14—C15176.6 (2)
Cl2—C1—C6—C5176.99 (19)C11—C12—C14—C156.7 (4)
C2—C1—C6—C7176.9 (2)C12—C14—C15—C1643.5 (4)
Cl2—C1—C6—C71.9 (3)C12—C14—C15—C20140.1 (3)
C4—C5—C6—C12.8 (4)C20—C15—C16—C170.8 (4)
C4—C5—C6—C7178.3 (3)C14—C15—C16—C17177.5 (2)
C1—C6—C7—C8145.0 (3)C15—C16—C17—C180.0 (4)
C5—C6—C7—C836.1 (4)C16—C17—C18—C190.5 (4)
C6—C7—C8—C13179.4 (2)C16—C17—C18—Cl3179.7 (2)
C6—C7—C8—C92.0 (4)C17—C18—C19—C200.3 (4)
C7—C8—C9—C10161.0 (2)Cl3—C18—C19—C20180.0 (2)
C13—C8—C9—C1017.6 (3)C18—C19—C20—C150.6 (4)
C8—C9—C10—C1153.5 (3)C18—C19—C20—Cl4179.8 (2)
C9—C10—C11—C1264.1 (3)C16—C15—C20—C191.1 (4)
C10—C11—C12—C14138.1 (3)C14—C15—C20—C19177.7 (2)
C10—C11—C12—C1338.5 (3)C16—C15—C20—Cl4179.69 (18)
C14—C12—C13—O17.0 (4)C14—C15—C20—Cl43.1 (3)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C7—H7A···Cl20.932.743.055 (2)101
C7—H7A···O10.932.332.732 (3)105
C14—H14A···O10.932.392.759 (3)103

Experimental details

Crystal data
Chemical formulaC20H14Cl4O
Mr412.11
Crystal system, space groupOrthorhombic, Pbca
Temperature (K)293
a, b, c (Å)14.469 (2), 8.0602 (12), 31.554 (4)
V3)3679.9 (9)
Z8
Radiation typeMo Kα
µ (mm1)0.65
Crystal size (mm)0.20 × 0.15 × 0.10
Data collection
DiffractometerBruker SMART CCD area-detector
diffractometer
Absorption correctionMulti-scan
(SADABS; Bruker, 1997)
Tmin, Tmax0.881, 0.938
No. of measured, independent and
observed [I > 2σ(I)] reflections
21985, 4570, 2735
Rint0.053
(sin θ/λ)max1)0.669
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.050, 0.118, 1.03
No. of reflections4570
No. of parameters226
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.24, 0.28

Computer programs: SMART (Bruker, 1997), SAINT (Bruker, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C7—H7A···Cl20.932.743.055 (2)100.8
C7—H7A···O10.932.332.732 (3)105.3
C14—H14A···O10.932.392.759 (3)103.3
 

Acknowledgements

The authors thank the National Science Foundation of Weifang University (grant: No.2008Z04).

References

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