organic compounds
3-Acetyl-1-(2,6-dichlorophenyl)thiourea
aDepartment of Chemistry, Mangalore University, Mangalagangotri 574 199, Mangalore, India, and bInstitute of Materials Science, Darmstadt University of Technology, Petersenstrasse 23, D-64287 Darmstadt, Germany
*Correspondence e-mail: gowdabt@yahoo.com
In the title compound, C9H8Cl2N2OS, the conformation of one of the N—H bonds is anti to the C=S group and the other is anti to the C=O group. Further, the conformations of the amide C=S and the C=O group are anti to each other. The 2,6-dichlorophenyl ring and the 3-acetylthiourea side chain are inclined to one another at a dihedral angle of 83.44 (5)°. An intramolecular N—H⋯O hydrogen bond occurs. In the crystal, molecules form inversion dimers through pairs of N—H⋯S hydrogen bonds.
Related literature
For studies of the effects of substituents on the structures and other aspects of N-(aryl)-amides, see: Bhat & Gowda (2000); Gowda et al. (2003); Shahwar et al. (2012), of N-(aryl)-methanesulfonamides, see: Gowda et al. (2007) and of N-chloroarylsulfonamides, see: Gowda et al. (2005); Shetty & Gowda (2004).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell CrysAlis CCD; data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S160053681202925X/sj5247sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681202925X/sj5247Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S160053681202925X/sj5247Isup3.cml
3-Acetyl-1-(2,6-dichlorophenyl)-thiourea was synthesized by adding a solution of acetyl chloride (0.10 mol) in acetone (30 ml) dropwise to a suspension of ammonium thiocyanate (0.10 mol) in acetone (30 ml). The reaction mixture was refluxed for 30 min. After cooling to room temperature, a solution of 2,6-dichloroaniline (0.10 mol) in acetone (10 ml) was added and refluxed for 3 h. The reaction mixture was poured into acidified cold water. The precipitated title compound was recrystallized to constant melting point from acetonitrile. The purity of the compound was checked and characterized by its infrared spectrum.
Plate like dark yellow single crystals used in X-ray diffraction studies were grown in acetonitrile solution by slow evaporation of the solvent at room temperature.
H atoms bonded to C were positioned with idealized geometry using a riding model with the aromatic C—H = 0.93 Å, methyl C—H = 0.96 Å. The amino H atoms were freely refined with the N—H distances restrained to 0.86 (2) Å. All H atoms were refined with isotropic displacement parameters set at 1.2 Ueq(C-aromatic, N) and 1.5 Ueq (C-methyl) of the parent atom.
Thiourea and its derivatives exhibit a wide variety of biological activities. As part of our studies of the substituent effects on the structures and other aspects of N-(aryl)-amides (Bhat & Gowda, 2000); Gowda et al., 2003; Shahwar et al., 2012); N-(aryl)-methanesulfonamides (Gowda et al., 2007) and N-chloroarylsulfonamides (Gowda et al., 2005; Shetty & Gowda, 2004), in the present work, the
of 3-acetyl-1-(2,6-dichlorophenyl)thiourea has been determined (Fig. 1).The conformations of the amide C═S and the C═O are anti to each other, similar to the anti conformation observed in 3-acetyl-1-(2-methylphenyl)thiourea (Shahwar et al., 2012). Further, the conformation of one of the N—H bonds is anti to the C═S and the other is anti to the C═O. The conformations of the two N—H bonds are are also anti to each other.
The side chain is tilted with respect to the 2,6-dichlorophenyl ring with torsion angles of C2—C1—N1—C7 = -86.22 (26)° and C6—C1—N1—C7 = 96.58 (24)°. The dihedral angle between the phenyl ring and the side chain is 83.44 (5)°.
The structure shows intramolecular hydrogen bonding between the NH hydrogen atom, attached to the 2,6-dichlorophenyl ring and the amide oxygen. In the crystal, the molecules form inversion type dimers through N—H···S intermolecular hydrogen bonds (Table 1, Fig.2).
For studies of the effects of substituents on the structures and other aspects of N-(aryl)-amides, see: Bhat & Gowda (2000); Gowda et al. (2003); Shahwar et al. (2012), of N-(aryl)-methanesulfonamides, see: Gowda et al. (2007) and of N-chloroarylsulfonamides, see: Gowda et al. (2005); Shetty & Gowda (2004).
Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell
CrysAlis CCD (Oxford Diffraction, 2009); data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C9H8Cl2N2OS | Z = 2 |
Mr = 263.13 | F(000) = 268 |
Triclinic, P1 | Dx = 1.577 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.729 (1) Å | Cell parameters from 2085 reflections |
b = 8.047 (1) Å | θ = 2.8–27.7° |
c = 10.015 (1) Å | µ = 0.75 mm−1 |
α = 88.05 (1)° | T = 293 K |
β = 76.39 (1)° | Plate, dark yellow |
γ = 66.57 (1)° | 0.44 × 0.44 × 0.04 mm |
V = 554.24 (11) Å3 |
Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector | 2232 independent reflections |
Radiation source: fine-focus sealed tube | 1930 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.013 |
Rotation method data acquisition using ω and phi scans. | θmax = 26.4°, θmin = 2.8° |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2009) | h = −9→9 |
Tmin = 0.735, Tmax = 0.971 | k = −10→9 |
3638 measured reflections | l = −7→12 |
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)] = 0.037 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | w = 1/[σ2(Fo2) + (0.0423P)2 + 0.2588P] where P = (Fo2 + 2Fc2)/3 |
2232 reflections | (Δ/σ)max = 0.005 |
143 parameters | Δρmax = 0.30 e Å−3 |
3 restraints | Δρmin = −0.36 e Å−3 |
C9H8Cl2N2OS | γ = 66.57 (1)° |
Mr = 263.13 | V = 554.24 (11) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.729 (1) Å | Mo Kα radiation |
b = 8.047 (1) Å | µ = 0.75 mm−1 |
c = 10.015 (1) Å | T = 293 K |
α = 88.05 (1)° | 0.44 × 0.44 × 0.04 mm |
β = 76.39 (1)° |
Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector | 2232 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2009) | 1930 reflections with I > 2σ(I) |
Tmin = 0.735, Tmax = 0.971 | Rint = 0.013 |
3638 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 3 restraints |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.09 | Δρmax = 0.30 e Å−3 |
2232 reflections | Δρmin = −0.36 e Å−3 |
143 parameters |
Experimental. Absorption correction: CrysAlis RED (Oxford Diffraction, 2009) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
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. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.0838 (3) | 0.5813 (3) | 0.14414 (19) | 0.0322 (4) | |
C2 | 0.2043 (3) | 0.5857 (3) | 0.0189 (2) | 0.0359 (5) | |
C3 | 0.3407 (3) | 0.4272 (3) | −0.0553 (2) | 0.0447 (6) | |
H3 | 0.4218 | 0.4319 | −0.1389 | 0.054* | |
C4 | 0.3548 (3) | 0.2629 (3) | −0.0042 (3) | 0.0488 (6) | |
H4 | 0.4466 | 0.1563 | −0.0537 | 0.059* | |
C5 | 0.2355 (4) | 0.2534 (3) | 0.1192 (3) | 0.0465 (6) | |
H5 | 0.2449 | 0.1416 | 0.1525 | 0.056* | |
C6 | 0.1012 (3) | 0.4131 (3) | 0.1927 (2) | 0.0374 (5) | |
C7 | −0.0252 (3) | 0.8408 (3) | 0.30587 (19) | 0.0300 (4) | |
C8 | −0.3676 (3) | 1.0659 (3) | 0.3506 (2) | 0.0356 (5) | |
C9 | −0.4980 (3) | 1.2494 (3) | 0.4221 (3) | 0.0524 (6) | |
H9A | −0.4576 | 1.3397 | 0.3769 | 0.079* | |
H9B | −0.4901 | 1.2490 | 0.5164 | 0.079* | |
H9C | −0.6296 | 1.2768 | 0.4187 | 0.079* | |
N1 | −0.0603 (2) | 0.7439 (2) | 0.21891 (17) | 0.0342 (4) | |
H1N | −0.175 (3) | 0.782 (3) | 0.210 (2) | 0.041* | |
N2 | −0.1818 (2) | 0.9960 (2) | 0.36945 (17) | 0.0349 (4) | |
H2N | −0.156 (3) | 1.053 (3) | 0.426 (2) | 0.042* | |
O1 | −0.4216 (2) | 0.9862 (2) | 0.28007 (18) | 0.0530 (5) | |
Cl1 | 0.18527 (10) | 0.79226 (8) | −0.04530 (6) | 0.05449 (19) | |
Cl2 | −0.04629 (11) | 0.40151 (9) | 0.34891 (6) | 0.0607 (2) | |
S1 | 0.19132 (8) | 0.78798 (8) | 0.33840 (6) | 0.04599 (18) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0283 (9) | 0.0309 (10) | 0.0335 (10) | −0.0061 (8) | −0.0087 (8) | −0.0104 (8) |
C2 | 0.0328 (10) | 0.0362 (11) | 0.0355 (10) | −0.0091 (9) | −0.0099 (8) | −0.0045 (8) |
C3 | 0.0327 (11) | 0.0510 (14) | 0.0374 (11) | −0.0048 (10) | −0.0038 (9) | −0.0144 (10) |
C4 | 0.0393 (12) | 0.0385 (13) | 0.0534 (14) | 0.0040 (10) | −0.0152 (11) | −0.0198 (11) |
C5 | 0.0501 (13) | 0.0290 (11) | 0.0562 (14) | −0.0061 (10) | −0.0214 (11) | −0.0052 (10) |
C6 | 0.0375 (11) | 0.0367 (11) | 0.0378 (11) | −0.0129 (9) | −0.0110 (9) | −0.0062 (9) |
C7 | 0.0291 (8) | 0.0289 (10) | 0.0276 (9) | −0.0089 (8) | −0.0025 (7) | −0.0048 (8) |
C8 | 0.0324 (10) | 0.0336 (11) | 0.0340 (10) | −0.0077 (9) | −0.0045 (8) | −0.0046 (8) |
C9 | 0.0411 (13) | 0.0410 (13) | 0.0574 (15) | 0.0012 (10) | −0.0084 (11) | −0.0153 (11) |
N1 | 0.0258 (8) | 0.0321 (9) | 0.0393 (9) | −0.0054 (7) | −0.0070 (7) | −0.0125 (7) |
N2 | 0.0315 (9) | 0.0324 (9) | 0.0353 (9) | −0.0067 (7) | −0.0066 (7) | −0.0131 (7) |
O1 | 0.0351 (8) | 0.0514 (10) | 0.0654 (11) | −0.0058 (7) | −0.0162 (8) | −0.0201 (8) |
Cl1 | 0.0596 (4) | 0.0476 (4) | 0.0521 (4) | −0.0206 (3) | −0.0080 (3) | 0.0075 (3) |
Cl2 | 0.0744 (5) | 0.0573 (4) | 0.0485 (4) | −0.0325 (3) | −0.0004 (3) | 0.0009 (3) |
S1 | 0.0299 (3) | 0.0539 (4) | 0.0455 (3) | −0.0060 (2) | −0.0090 (2) | −0.0226 (3) |
C1—C2 | 1.384 (3) | C7—N1 | 1.329 (2) |
C1—C6 | 1.388 (3) | C7—N2 | 1.385 (2) |
C1—N1 | 1.424 (2) | C7—S1 | 1.664 (2) |
C2—C3 | 1.384 (3) | C8—O1 | 1.211 (2) |
C2—Cl1 | 1.725 (2) | C8—N2 | 1.376 (3) |
C3—C4 | 1.374 (4) | C8—C9 | 1.503 (3) |
C3—H3 | 0.9300 | C9—H9A | 0.9600 |
C4—C5 | 1.377 (4) | C9—H9B | 0.9600 |
C4—H4 | 0.9300 | C9—H9C | 0.9600 |
C5—C6 | 1.384 (3) | N1—H1N | 0.836 (16) |
C5—H5 | 0.9300 | N2—H2N | 0.845 (16) |
C6—Cl2 | 1.730 (2) | ||
C2—C1—C6 | 118.15 (18) | N1—C7—N2 | 115.94 (17) |
C2—C1—N1 | 121.29 (19) | N1—C7—S1 | 124.10 (15) |
C6—C1—N1 | 120.50 (18) | N2—C7—S1 | 119.95 (14) |
C1—C2—C3 | 121.2 (2) | O1—C8—N2 | 122.41 (18) |
C1—C2—Cl1 | 119.41 (15) | O1—C8—C9 | 122.4 (2) |
C3—C2—Cl1 | 119.43 (18) | N2—C8—C9 | 115.21 (18) |
C4—C3—C2 | 119.3 (2) | C8—C9—H9A | 109.5 |
C4—C3—H3 | 120.4 | C8—C9—H9B | 109.5 |
C2—C3—H3 | 120.4 | H9A—C9—H9B | 109.5 |
C3—C4—C5 | 121.1 (2) | C8—C9—H9C | 109.5 |
C3—C4—H4 | 119.4 | H9A—C9—H9C | 109.5 |
C5—C4—H4 | 119.4 | H9B—C9—H9C | 109.5 |
C4—C5—C6 | 118.8 (2) | C7—N1—C1 | 123.48 (17) |
C4—C5—H5 | 120.6 | C7—N1—H1N | 116.3 (16) |
C6—C5—H5 | 120.6 | C1—N1—H1N | 120.3 (16) |
C5—C6—C1 | 121.4 (2) | C8—N2—C7 | 128.23 (17) |
C5—C6—Cl2 | 118.92 (18) | C8—N2—H2N | 117.7 (16) |
C1—C6—Cl2 | 119.64 (15) | C7—N2—H2N | 114.0 (16) |
C6—C1—C2—C3 | −1.0 (3) | N1—C1—C6—C5 | 177.63 (19) |
N1—C1—C2—C3 | −178.23 (18) | C2—C1—C6—Cl2 | 179.87 (15) |
C6—C1—C2—Cl1 | 179.45 (15) | N1—C1—C6—Cl2 | −2.8 (3) |
N1—C1—C2—Cl1 | 2.2 (3) | N2—C7—N1—C1 | 179.64 (19) |
C1—C2—C3—C4 | 0.7 (3) | S1—C7—N1—C1 | 0.7 (3) |
Cl1—C2—C3—C4 | −179.70 (17) | C2—C1—N1—C7 | −86.2 (3) |
C2—C3—C4—C5 | 0.2 (3) | C6—C1—N1—C7 | 96.6 (2) |
C3—C4—C5—C6 | −0.8 (3) | O1—C8—N2—C7 | 6.5 (4) |
C4—C5—C6—C1 | 0.5 (3) | C9—C8—N2—C7 | −172.7 (2) |
C4—C5—C6—Cl2 | −179.01 (17) | N1—C7—N2—C8 | −2.4 (3) |
C2—C1—C6—C5 | 0.3 (3) | S1—C7—N2—C8 | 176.56 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1 | 0.84 (2) | 1.94 (2) | 2.631 (2) | 139 (2) |
N2—H2N···S1i | 0.85 (2) | 2.63 (2) | 3.4252 (17) | 158 (2) |
Symmetry code: (i) −x, −y+2, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C9H8Cl2N2OS |
Mr | 263.13 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 7.729 (1), 8.047 (1), 10.015 (1) |
α, β, γ (°) | 88.05 (1), 76.39 (1), 66.57 (1) |
V (Å3) | 554.24 (11) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.75 |
Crystal size (mm) | 0.44 × 0.44 × 0.04 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2009) |
Tmin, Tmax | 0.735, 0.971 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3638, 2232, 1930 |
Rint | 0.013 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.095, 1.09 |
No. of reflections | 2232 |
No. of parameters | 143 |
No. of restraints | 3 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.30, −0.36 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2009), CrysAlis RED (Oxford Diffraction, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1 | 0.836 (16) | 1.94 (2) | 2.631 (2) | 139 (2) |
N2—H2N···S1i | 0.845 (16) | 2.628 (17) | 3.4252 (17) | 158 (2) |
Symmetry code: (i) −x, −y+2, −z+1. |
Acknowledgements
BTG thanks the University Grants Commission, Government of India, New Delhi, for a special grant under a UGC–BSR one-time Grant to faculty.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Thiourea and its derivatives exhibit a wide variety of biological activities. As part of our studies of the substituent effects on the structures and other aspects of N-(aryl)-amides (Bhat & Gowda, 2000); Gowda et al., 2003; Shahwar et al., 2012); N-(aryl)-methanesulfonamides (Gowda et al., 2007) and N-chloroarylsulfonamides (Gowda et al., 2005; Shetty & Gowda, 2004), in the present work, the crystal structure of 3-acetyl-1-(2,6-dichlorophenyl)thiourea has been determined (Fig. 1).
The conformations of the amide C═S and the C═O are anti to each other, similar to the anti conformation observed in 3-acetyl-1-(2-methylphenyl)thiourea (Shahwar et al., 2012). Further, the conformation of one of the N—H bonds is anti to the C═S and the other is anti to the C═O. The conformations of the two N—H bonds are are also anti to each other.
The side chain is tilted with respect to the 2,6-dichlorophenyl ring with torsion angles of C2—C1—N1—C7 = -86.22 (26)° and C6—C1—N1—C7 = 96.58 (24)°. The dihedral angle between the phenyl ring and the side chain is 83.44 (5)°.
The structure shows intramolecular hydrogen bonding between the NH hydrogen atom, attached to the 2,6-dichlorophenyl ring and the amide oxygen. In the crystal, the molecules form inversion type dimers through N—H···S intermolecular hydrogen bonds (Table 1, Fig.2).