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Acta Cryst. (2008). E64, o828    [ doi:10.1107/S1600536808009264 ]

2,2,2-Trichloro-N-(2,5-dimethylphenyl)acetamide

B. T. Gowda, S. Foro and H. Fuess

Abstract top

The N-H bond in the title compound, C10H10Cl3NO, is syn to the 2-methyl and anti to the 5-methyl substituent of the aromatic ring. Adjacent molecules are linked into chains through N-H...O hydrogen bonding. Two Cl atoms are each disordered equally over two sites.

Comment top

In the present work, the structure of 2,2,2-trichloro-N- (2,5-dimethylphenyl)acetamide (25DMPTCA) has been determined to study the effect of substituents on the structures of N-aromatic amides (Gowda, Foro et al., 2007; Gowda, Kožíšek et al., 2007). The conformation of the N—H bond in 25DMPTCA is syn to the 2-methyl and anti to the 5-methyl substituents in the aromatic ring (Fig. 1), similar to the syn conformation observed with respect to the 2-methyl substituent in 2,2,2-trichloro-N-(2-methylphenyl)acetamide (2MPTCA) (Gowda, Kožíšek et al., 2007). The bond parameters in 25DMPTCA are similar to those in 2MPTCA, 2,2,2-trichloro-N-(2,6-dimethylphenyl)- acetamide and other acetanilides (Gowda, Foro et al., 2007; Gowda, Kožíšek et al., 2007). The intermolecular N—H···O hydrogen bonds link the molecules into chains (Table 1 and Fig.2). The Cl atoms of CCl3 group are disordered and Cl1 and Cl3 were refined using a split model with site-occupation factors 0.5:0.5. No reliable disorder model could be produced for Cl2.

Related literature top

For related literature, see: Gowda, Foro & Fuess (2007); Gowda, Kožíšek et al. (2007); Shilpa & Gowda (2007).

Experimental top

The title compound was prepared according to the literature method (Shilpa and Gowda, 2007). The purity of the compound was checked by determining its melting point. It was characterized by recording its infrared and NMR spectra (Shilpa and Gowda, 2007). Single crystals of the title compound were obtained from an ethanolic solution and used for X-ray diffraction studies at room temperature.

Refinement top

The H atoms were positioned with idealized geometry using a riding model with C—H = 0.93–0.96 Å, N—H = 0.86 Å. All H atoms were refined with isotropic displacement parameters (set to 1.2 times of the Ueq of the parent atom).

The Cl atoms of CCl3 group are disordered and Cl1 and Cl3 were refined using a split model with site-occupation factors 0.5:0.5. No reliable disorder model could be produced for Cl2. The C—Cl distances were restrained to 1.77 (2) Å and the distances in the disordered groups were restrained to be equal.

The compound is a weak anamalous scatterer with minor intensity at high θ value. The low fraction of unique data is above the 2σ level (30°).

Computing details top

Data collection: CrysAlis CCD (Oxford Diffraction, 2004); cell refinement: CrysAlis RED (Oxford Diffraction, 2007); data reduction: CrysAlis RED (Oxford Diffraction, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. Molecular structure of the title compound, showing the atom labeling scheme. The displacement ellipsoids drawn at the 50% probability level.
[Figure 2] Fig. 2. Molecular packing of the title compound with hydrogen bonding shown as dashed lines.
2,2,2-Trichloro-N-(2,5-dimethylphenyl)acetamide top
Crystal data top
C10H10Cl3NOF000 = 544
Mr = 266.54Dx = 1.514 Mg m−3
Orthorhombic, P212121Mo Kα radiation
λ = 0.71073 Å
Hall symbol: P 2ac 2abCell parameters from 1061 reflections
a = 4.9173 (9) Åθ = 2.6–28.1º
b = 11.290 (1) ŵ = 0.76 mm−1
c = 21.070 (2) ÅT = 299 (2) K
V = 1169.7 (3) Å3Prism, colourless
Z = 40.16 × 0.12 × 0.06 mm
Data collection top
Oxford Diffraction Xcalibur
diffractometer with Sapphire CCD detector		2314 independent reflections
Radiation source: Enhance (Mo) X-ray Source703 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.071
T = 299(2) Kθmax = 26.4º
Rotation method data acquisition using ω and phi scans.θmin = 3.4º
Absorption correction: multi-scan
(CrysAlis RED; Oxford Diffraction, 2007)		h = −6→6
Tmin = 0.889, Tmax = 0.956k = −14→13
6121 measured reflectionsl = −26→23
Refinement top
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH-atom parameters constrained
R[F2 > 2σ(F2)] = 0.088  w = 1/[σ2(Fo2) + (0.1675P)2]
where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.309(Δ/σ)max = 0.003
S = 0.86Δρmax = 0.27 e Å−3
2314 reflectionsΔρmin = −0.76 e Å−3
154 parametersExtinction correction: none
37 restraintsAbsolute structure: Flack (1983), 887 Friedel pairs
Primary atom site location: structure-invariant direct methodsFlack parameter: −0.4 (4)
Secondary atom site location: difference Fourier map
Crystal data top
C10H10Cl3NOV = 1169.7 (3) Å3
Mr = 266.54Z = 4
Orthorhombic, P212121Mo Kα
a = 4.9173 (9) ŵ = 0.76 mm−1
b = 11.290 (1) ÅT = 299 (2) K
c = 21.070 (2) Å0.16 × 0.12 × 0.06 mm
Data collection top
Oxford Diffraction Xcalibur
diffractometer with Sapphire CCD detector		2314 independent reflections
Absorption correction: multi-scan
(CrysAlis RED; Oxford Diffraction, 2007)		703 reflections with I > 2σ(I)
Tmin = 0.889, Tmax = 0.956Rint = 0.071
6121 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.088H-atom parameters constrained
wR(F2) = 0.309Δρmax = 0.27 e Å−3
S = 0.86Δρmin = −0.76 e Å−3
2314 reflectionsAbsolute structure: Flack (1983), 887 Friedel pairs
154 parametersFlack parameter: −0.4 (4)
37 restraints
Special details top

Experimental. 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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Cl1A0.4909 (19)0.3895 (7)0.5055 (3)0.096 (2)0.50
Cl1B0.301 (3)0.3888 (10)0.5125 (4)0.139 (4)0.50
Cl20.0276 (14)0.5253 (7)0.5201 (3)0.218 (3)
Cl3A0.459 (2)0.6280 (6)0.4526 (3)0.102 (2)0.50
Cl3B0.226 (2)0.6324 (7)0.4737 (5)0.141 (3)0.50
O6−0.0518 (17)0.4448 (7)0.3920 (4)0.092 (3)
N70.3670 (16)0.4054 (7)0.3571 (4)0.069 (2)
H7N0.53560.41630.36620.083*
C40.311 (2)0.4931 (7)0.4592 (4)0.082 (3)
C50.180 (3)0.4444 (9)0.4003 (6)0.075 (3)
C80.308 (2)0.3488 (8)0.2991 (4)0.055 (3)
C90.4334 (19)0.2416 (9)0.2866 (5)0.062 (3)
C100.358 (2)0.1877 (10)0.2267 (5)0.079 (3)
H100.43360.11510.21540.095*
C110.178 (2)0.2420 (10)0.1863 (4)0.067 (3)
H110.13710.20540.14800.080*
C120.055 (2)0.3486 (10)0.2002 (5)0.069 (3)
C130.125 (2)0.4011 (9)0.2572 (4)0.062 (3)
H130.04660.47350.26790.074*
C140.624 (2)0.1827 (8)0.3309 (5)0.075 (3)
H14A0.53120.16550.37000.090*
H14B0.77500.23410.33920.090*
H14C0.68780.11030.31230.090*
C15−0.138 (2)0.4037 (11)0.1548 (5)0.091 (3)
H15A−0.28380.34970.14620.109*
H15B−0.04410.42180.11600.109*
H15C−0.20940.47530.17270.109*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cl1A0.116 (6)0.109 (5)0.063 (3)0.023 (5)0.000 (4)−0.003 (3)
Cl1B0.172 (8)0.151 (7)0.093 (5)−0.036 (7)0.005 (6)0.037 (5)
Cl20.213 (6)0.278 (7)0.163 (4)0.011 (6)0.007 (4)−0.053 (4)
Cl3A0.135 (6)0.086 (4)0.086 (4)−0.038 (4)0.016 (4)−0.025 (3)
Cl3B0.151 (7)0.117 (6)0.154 (6)0.018 (6)−0.027 (6)−0.049 (5)
O60.052 (4)0.127 (7)0.099 (5)0.011 (5)−0.007 (4)−0.040 (5)
N70.049 (5)0.068 (5)0.092 (6)−0.004 (5)−0.014 (5)0.016 (5)
C40.091 (8)0.070 (7)0.084 (7)0.002 (7)−0.025 (7)−0.019 (6)
C50.056 (7)0.081 (8)0.088 (7)0.011 (7)−0.018 (7)−0.019 (6)
C80.055 (6)0.061 (6)0.048 (5)−0.009 (6)0.004 (6)−0.005 (5)
C90.045 (5)0.056 (6)0.086 (7)0.011 (6)0.004 (6)0.018 (6)
C100.079 (8)0.064 (7)0.095 (8)−0.004 (7)0.000 (7)−0.012 (6)
C110.077 (8)0.064 (7)0.061 (6)−0.004 (7)0.005 (6)0.005 (5)
C120.063 (7)0.078 (8)0.066 (6)−0.016 (7)−0.003 (6)0.022 (6)
C130.062 (6)0.062 (5)0.062 (6)0.006 (6)−0.005 (6)0.010 (5)
C140.073 (7)0.050 (6)0.102 (7)0.001 (7)−0.004 (7)0.000 (6)
C150.080 (8)0.119 (9)0.074 (6)−0.001 (9)−0.017 (7)0.019 (7)
Geometric parameters (Å, °) top
Cl1A—C41.761 (11)C10—C111.373 (14)
Cl1B—C41.628 (11)C10—H100.9300
Cl2—C41.931 (10)C11—C121.378 (13)
Cl3A—C41.693 (10)C11—H110.9300
Cl3B—C41.656 (10)C12—C131.382 (14)
O6—C51.151 (11)C12—C151.484 (14)
N7—C51.367 (13)C13—H130.9300
N7—C81.411 (11)C14—H14A0.9600
N7—H7N0.8600C14—H14B0.9600
C4—C51.503 (13)C14—H14C0.9600
C8—C91.383 (12)C15—H15A0.9600
C8—C131.393 (13)C15—H15B0.9600
C9—C101.449 (14)C15—H15C0.9600
C9—C141.480 (12)
C5—N7—C8125.7 (8)C10—C9—C14121.5 (9)
C5—N7—H7N117.1C11—C10—C9121.1 (10)
C8—N7—H7N117.1C11—C10—H10119.5
C5—C4—Cl1B106.9 (8)C9—C10—H10119.5
C5—C4—Cl3B113.0 (8)C10—C11—C12122.8 (10)
Cl1B—C4—Cl3B123.5 (8)C10—C11—H11118.6
C5—C4—Cl3A116.5 (7)C12—C11—H11118.6
Cl1B—C4—Cl3A136.1 (7)C11—C12—C13116.8 (9)
Cl3B—C4—Cl3A43.0 (5)C11—C12—C15120.6 (10)
C5—C4—Cl1A115.4 (7)C13—C12—C15122.6 (11)
Cl1B—C4—Cl1A32.1 (4)C12—C13—C8121.9 (9)
Cl3B—C4—Cl1A131.0 (7)C12—C13—H13119.1
Cl3A—C4—Cl1A115.4 (7)C8—C13—H13119.1
C5—C4—Cl2107.8 (8)C9—C14—H14A109.5
Cl1B—C4—Cl269.8 (7)C9—C14—H14B109.5
Cl3B—C4—Cl261.1 (6)H14A—C14—H14B109.5
Cl3A—C4—Cl2101.2 (5)C9—C14—H14C109.5
Cl1A—C4—Cl296.8 (6)H14A—C14—H14C109.5
O6—C5—N7124.5 (10)H14B—C14—H14C109.5
O6—C5—C4123.3 (12)C12—C15—H15A109.5
N7—C5—C4112.1 (10)C12—C15—H15B109.5
C9—C8—C13122.6 (9)H15A—C15—H15B109.5
C9—C8—N7118.0 (9)C12—C15—H15C109.5
C13—C8—N7119.4 (9)H15A—C15—H15C109.5
C8—C9—C10114.8 (9)H15B—C15—H15C109.5
C8—C9—C14123.7 (9)
C8—N7—C5—O6−7.0 (17)C13—C8—C9—C10−0.2 (13)
C8—N7—C5—C4176.0 (8)N7—C8—C9—C10178.7 (9)
Cl1B—C4—C5—O684.0 (14)C13—C8—C9—C14−178.4 (9)
Cl3B—C4—C5—O6−55.0 (16)N7—C8—C9—C140.6 (13)
Cl3A—C4—C5—O6−102.5 (14)C8—C9—C10—C110.6 (14)
Cl1A—C4—C5—O6117.4 (13)C14—C9—C10—C11178.8 (9)
Cl2—C4—C5—O610.4 (14)C9—C10—C11—C12−1.1 (17)
Cl1B—C4—C5—N7−99.0 (10)C10—C11—C12—C131.0 (15)
Cl3B—C4—C5—N7121.9 (10)C10—C11—C12—C15179.7 (10)
Cl3A—C4—C5—N774.5 (11)C11—C12—C13—C8−0.6 (14)
Cl1A—C4—C5—N7−65.6 (11)C15—C12—C13—C8−179.3 (9)
Cl2—C4—C5—N7−172.6 (7)C9—C8—C13—C120.3 (14)
C5—N7—C8—C9−127.3 (10)N7—C8—C13—C12−178.7 (9)
C5—N7—C8—C1351.7 (12)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N7—H7N···O6i0.862.122.984 (11)178
Symmetry codes: (i) x+1, y, z.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N7—H7N···O6i0.862.122.984 (11)178
Symmetry codes: (i) x+1, y, z.
Acknowledgements top

BTG thanks the Alexander von Humboldt Foundation, Bonn, Germany, for extensions of his research fellowship.

references
References top

Flack, H. D. (1983). Acta Cryst. A39, 876–881.

Gowda, B. T., Foro, S. & Fuess, H. (2007). Acta Cryst. E63, o2343–o2344.

Gowda, B. T., Kožíšek, J., Tokarčík, M. & Fuess, H. (2007). Acta Cryst. E63, o2571–o2572.

Oxford Diffraction (2004). CrysAlis CCD. Oxford Diffraction Ltd. Köln, Germany.

Oxford Diffraction (2007). CrysAlis RED. Oxford Diffraction Ltd. Köln, Germany.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

Shilpa & Gowda, B.T. (2007). Z. Naturforsch. Teil A, 62, 84–90.

Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13.