organic compounds
N-(4-Chlorobenzylidene)-3,4-dimethylisoxazol-5-amine
aThe Center of Excellence for Advanced Materials Research, King Abdul Aziz University, Jeddah 21589, PO Box 80203, Saudi Arabia, bDepartment of Chemistry, Faculty of Science, King Abdul Aziz University, Jeddah 21589, PO Box 80203, Saudi Arabia, and cDepartment of Physics, University of Sargodha, Sargodha, Pakistan
*Correspondence e-mail: dmntahir_uos@yahoo.com
The molecule of the title compound, C12H11ClN2O, has E configuration at the azomethine double bond and is virtually planar with a dihedral angle of 1.25 (13)° between the benzene and isoxazole rings. C—H⋯π interactions stabilize the crystal structure.
Related literature
For related structures, see: Asiri et al. (2010a,b); Fun et al. (2010a,b); Shad et al. (2008); Tahir et al. (2008). For graph-set notation, see: Bernstein et al. (1995).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON.
Supporting information
https://doi.org/10.1107/S1600536810029284/gk2296sup1.cif
contains datablocks text, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810029284/gk2296Isup2.hkl
A mixture of 4-chlorobenzaldehyde (0.30 g, 2.2 mmol) and 5-amino-3,4-dimethylisoxazole (0.24 g, 2.2 mmol) in ethanol (15 ml) was refluxed for 5 h with stirring to give a light brown precipitate. This material was filtered off and washed with ethanol to give the pure Schiff base (m.p. 397 K; yield: 78.5%)
1H-NMR (CDCl3) δ: 9.97 (s, 1H, CHolefinic), 7.79 (d, H3, CHaromatic J = 5.4 Hz), 7.75 (dd, H4, CHaromatic, J = 8.4 Hz), 7.69 (dd, H5, CHaromatic J = 8.4 Hz), 7.61 (d, H6 CHaromatic, J = 4.8 Hz), 2.25 (s, N—CH3), 1.76 (s,-CH3).
The H-atoms were positioned geometrically (C–H = 0.93–0.96 Å) and refined as riding with Uiso(H) = xUeq(C), where x = 1.5 for methyl and x = 1.2 for other H-atoms.
The title compound (Fig. 1) has been prepared in continuation of our work on the synthesis of
of 3,4-dimethyisoxazol-5-amine. We have recently reported the of N-(4-bromobenzylidene)-3,4-dimethylisoxazol-5-amine (Asiri et al., 2010a), which is isostructural with the title compound.The crystal structures of 4-chloro-2- [(E)-({4-[N-(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl}iminio) methyl]phenolate (Shad et al., 2008), 4-bromo-2-((E)-{4-[(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl} iminiomethyl)phenolate (Tahir et al., 2008), 2-[(E)-(3,4-dimethylisoxazol-5-yl)iminomethyl]phenol (Fun et al., 2010a), 1-[(E)-(3,4-dimethylisoxazol-5-yl)iminomethyl]-2-naphthol (Fun et al., 2010b) and N-[4-(dimethylamino)benzylidene]-3,4-dimethylisoxazol-5-amine (Asiri et al., 2010b) have also been published previously, which contain the 5-amino-3,4-dimethylisoxazole moiety.
In the title compound, the 4-chlorobenzylidene moiety A (C1—C7/CL1) and 5-amino-3,4-dimethylisoxazole moiety B (N1/C8—C12/N2/O1) are planar with r. m. s. deviation of 0.0042 and 0.0076 Å, respectively. The dihedral angle between A/B is 1.10 (11)°. R. m. s. deviation from the plane of all non-hydrogen atoms in the molecule is 0.0200 Å, with the largest deviation of the CL1 atom [0.0534 (11) Å]. Weak intramolecular H-bonding of C—H···O type (Table 1, Fig. 1) exists and complete an S(5) ring motif (Bernstein et al., 1995). There exists no π···π interaction. The C—H···π interaction (Table 1) play an important role in stabilizing the molecules.
For related structures, see: Asiri et al. (2010a,b); Fun et al. (2010a,b); Shad et al. (2008); Tahir et al. (2008). For graph-set notation, see: Bernstein et al. (1995).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2009).C12H11ClN2O | F(000) = 488 |
Mr = 234.68 | Dx = 1.325 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 1539 reflections |
a = 5.0877 (2) Å | θ = 2.3–25.3° |
b = 24.5197 (9) Å | µ = 0.30 mm−1 |
c = 9.4673 (4) Å | T = 296 K |
β = 94.871 (2)° | Needle, light brown |
V = 1176.77 (8) Å3 | 0.30 × 0.16 × 0.14 mm |
Z = 4 |
Bruker KAPPA APEXII CCD diffractometer | 2112 independent reflections |
Radiation source: fine-focus sealed tube | 1539 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.030 |
Detector resolution: 8.10 pixels mm-1 | θmax = 25.3°, θmin = 2.3° |
ω scans | h = −6→6 |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | k = −29→29 |
Tmin = 0.868, Tmax = 0.965 | l = −11→11 |
9016 measured reflections |
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)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.120 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0521P)2 + 0.2476P] where P = (Fo2 + 2Fc2)/3 |
2112 reflections | (Δ/σ)max < 0.001 |
147 parameters | Δρmax = 0.15 e Å−3 |
0 restraints | Δρmin = −0.14 e Å−3 |
C12H11ClN2O | V = 1176.77 (8) Å3 |
Mr = 234.68 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 5.0877 (2) Å | µ = 0.30 mm−1 |
b = 24.5197 (9) Å | T = 296 K |
c = 9.4673 (4) Å | 0.30 × 0.16 × 0.14 mm |
β = 94.871 (2)° |
Bruker KAPPA APEXII CCD diffractometer | 2112 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 1539 reflections with I > 2σ(I) |
Tmin = 0.868, Tmax = 0.965 | Rint = 0.030 |
9016 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.120 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.15 e Å−3 |
2112 reflections | Δρmin = −0.14 e Å−3 |
147 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
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 | ||
Cl1 | −0.59118 (13) | 0.19483 (3) | −0.44471 (7) | 0.0894 (3) | |
O1 | 0.5343 (3) | 0.03641 (6) | 0.15781 (16) | 0.0736 (6) | |
N1 | 0.3653 (3) | 0.11804 (7) | 0.05045 (17) | 0.0608 (6) | |
N2 | 0.7399 (4) | 0.02071 (8) | 0.2600 (2) | 0.0763 (7) | |
C1 | −0.0022 (4) | 0.11701 (8) | −0.1255 (2) | 0.0576 (7) | |
C2 | −0.1918 (4) | 0.08576 (9) | −0.2009 (2) | 0.0676 (8) | |
C3 | −0.3750 (4) | 0.10921 (9) | −0.2987 (2) | 0.0701 (8) | |
C4 | −0.3674 (4) | 0.16448 (9) | −0.3200 (2) | 0.0630 (8) | |
C5 | −0.1824 (5) | 0.19639 (9) | −0.2446 (3) | 0.0775 (9) | |
C6 | −0.0019 (4) | 0.17261 (10) | −0.1484 (3) | 0.0724 (8) | |
C7 | 0.1915 (4) | 0.09088 (9) | −0.0251 (2) | 0.0622 (7) | |
C8 | 0.5459 (4) | 0.09160 (9) | 0.1431 (2) | 0.0576 (7) | |
C9 | 0.7462 (4) | 0.11227 (8) | 0.2291 (2) | 0.0575 (7) | |
C10 | 0.8603 (4) | 0.06588 (9) | 0.2988 (2) | 0.0617 (7) | |
C11 | 1.0916 (4) | 0.06456 (11) | 0.4077 (2) | 0.0785 (9) | |
C12 | 0.8318 (4) | 0.16992 (9) | 0.2438 (3) | 0.0778 (9) | |
H2 | −0.19609 | 0.04832 | −0.18554 | 0.0811* | |
H3 | −0.50149 | 0.08784 | −0.34921 | 0.0842* | |
H5 | −0.18016 | 0.23391 | −0.25895 | 0.0930* | |
H6 | 0.12298 | 0.19425 | −0.09757 | 0.0869* | |
H7 | 0.18824 | 0.05313 | −0.01578 | 0.0746* | |
H11A | 1.15318 | 0.02772 | 0.42002 | 0.1177* | |
H11B | 1.03940 | 0.07821 | 0.49613 | 0.1177* | |
H11C | 1.23056 | 0.08692 | 0.37665 | 0.1177* | |
H12A | 0.72003 | 0.19230 | 0.18085 | 0.1168* | |
H12B | 1.01097 | 0.17312 | 0.22023 | 0.1168* | |
H12C | 0.81971 | 0.18168 | 0.33972 | 0.1168* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0947 (5) | 0.0856 (5) | 0.0842 (4) | 0.0155 (3) | −0.0142 (3) | 0.0044 (3) |
O1 | 0.0787 (10) | 0.0567 (9) | 0.0821 (10) | −0.0045 (7) | −0.0123 (8) | −0.0012 (7) |
N1 | 0.0579 (10) | 0.0613 (11) | 0.0634 (10) | −0.0002 (8) | 0.0067 (8) | −0.0017 (8) |
N2 | 0.0797 (12) | 0.0638 (12) | 0.0816 (12) | 0.0000 (10) | −0.0161 (10) | 0.0055 (10) |
C1 | 0.0568 (11) | 0.0568 (12) | 0.0597 (11) | 0.0007 (9) | 0.0079 (9) | −0.0057 (9) |
C2 | 0.0741 (14) | 0.0517 (12) | 0.0761 (14) | −0.0019 (10) | 0.0014 (11) | −0.0053 (11) |
C3 | 0.0702 (14) | 0.0664 (14) | 0.0715 (14) | −0.0028 (11) | −0.0071 (11) | −0.0110 (11) |
C4 | 0.0642 (13) | 0.0644 (14) | 0.0602 (12) | 0.0080 (10) | 0.0041 (10) | −0.0028 (10) |
C5 | 0.0836 (16) | 0.0537 (13) | 0.0932 (17) | −0.0027 (11) | −0.0041 (13) | 0.0021 (12) |
C6 | 0.0709 (14) | 0.0617 (14) | 0.0822 (15) | −0.0064 (11) | −0.0074 (11) | −0.0056 (12) |
C7 | 0.0663 (13) | 0.0559 (12) | 0.0647 (12) | 0.0006 (10) | 0.0077 (10) | −0.0048 (10) |
C8 | 0.0589 (12) | 0.0548 (12) | 0.0598 (11) | 0.0013 (9) | 0.0099 (9) | −0.0006 (9) |
C9 | 0.0565 (11) | 0.0618 (13) | 0.0552 (11) | −0.0041 (10) | 0.0102 (9) | −0.0011 (10) |
C10 | 0.0633 (12) | 0.0647 (13) | 0.0575 (11) | −0.0039 (11) | 0.0082 (9) | 0.0004 (10) |
C11 | 0.0716 (14) | 0.0913 (18) | 0.0708 (14) | −0.0056 (12) | −0.0044 (11) | 0.0059 (12) |
C12 | 0.0793 (15) | 0.0613 (14) | 0.0921 (16) | −0.0106 (12) | 0.0026 (12) | −0.0055 (12) |
Cl1—C4 | 1.737 (2) | C9—C10 | 1.415 (3) |
O1—N2 | 1.417 (2) | C9—C12 | 1.482 (3) |
O1—C8 | 1.362 (3) | C10—C11 | 1.498 (3) |
N1—C7 | 1.277 (3) | C2—H2 | 0.9300 |
N1—C8 | 1.377 (3) | C3—H3 | 0.9300 |
N2—C10 | 1.303 (3) | C5—H5 | 0.9300 |
C1—C2 | 1.382 (3) | C6—H6 | 0.9300 |
C1—C6 | 1.380 (3) | C7—H7 | 0.9300 |
C1—C7 | 1.458 (3) | C11—H11A | 0.9600 |
C2—C3 | 1.382 (3) | C11—H11B | 0.9600 |
C3—C4 | 1.371 (3) | C11—H11C | 0.9600 |
C4—C5 | 1.376 (3) | C12—H12A | 0.9600 |
C5—C6 | 1.368 (4) | C12—H12B | 0.9600 |
C8—C9 | 1.348 (3) | C12—H12C | 0.9600 |
Cl1···H12Ci | 3.0600 | C12···H11C | 3.0700 |
O1···H7 | 2.3400 | H2···H7 | 2.4300 |
O1···H2ii | 2.7200 | H2···O1ii | 2.7200 |
N1···H6 | 2.5800 | H3···C11vi | 3.0200 |
N1···H12A | 2.7800 | H6···N1 | 2.5800 |
N1···H12Biii | 2.8500 | H7···O1 | 2.3400 |
C3···C7iii | 3.570 (3) | H7···H2 | 2.4300 |
C7···C3iv | 3.570 (3) | H11B···C3vii | 3.0800 |
C7···C9iii | 3.482 (3) | H11C···C8iv | 2.8400 |
C9···C7iv | 3.482 (3) | H11C···C12 | 3.0700 |
C3···H11Bi | 3.0800 | H12A···N1 | 2.7800 |
C8···H11Ciii | 2.8400 | H12B···N1iv | 2.8500 |
C11···H3v | 3.0200 | H12C···Cl1vii | 3.0600 |
N2—O1—C8 | 107.69 (15) | C1—C2—H2 | 119.00 |
C7—N1—C8 | 120.28 (18) | C3—C2—H2 | 119.00 |
O1—N2—C10 | 105.29 (17) | C2—C3—H3 | 121.00 |
C2—C1—C6 | 118.45 (19) | C4—C3—H3 | 121.00 |
C2—C1—C7 | 119.77 (18) | C4—C5—H5 | 120.00 |
C6—C1—C7 | 121.78 (19) | C6—C5—H5 | 120.00 |
C1—C2—C3 | 121.1 (2) | C1—C6—H6 | 119.00 |
C2—C3—C4 | 118.94 (19) | C5—C6—H6 | 119.00 |
Cl1—C4—C3 | 119.90 (16) | N1—C7—H7 | 119.00 |
Cl1—C4—C5 | 119.28 (18) | C1—C7—H7 | 119.00 |
C3—C4—C5 | 120.82 (19) | C10—C11—H11A | 109.00 |
C4—C5—C6 | 119.6 (2) | C10—C11—H11B | 109.00 |
C1—C6—C5 | 121.1 (2) | C10—C11—H11C | 109.00 |
N1—C7—C1 | 122.3 (2) | H11A—C11—H11B | 109.00 |
O1—C8—N1 | 120.02 (18) | H11A—C11—H11C | 109.00 |
O1—C8—C9 | 110.42 (18) | H11B—C11—H11C | 109.00 |
N1—C8—C9 | 129.6 (2) | C9—C12—H12A | 109.00 |
C8—C9—C10 | 103.81 (18) | C9—C12—H12B | 109.00 |
C8—C9—C12 | 128.04 (19) | C9—C12—H12C | 109.00 |
C10—C9—C12 | 128.13 (19) | H12A—C12—H12B | 109.00 |
N2—C10—C9 | 112.79 (18) | H12A—C12—H12C | 109.00 |
N2—C10—C11 | 119.9 (2) | H12B—C12—H12C | 110.00 |
C9—C10—C11 | 127.3 (2) | ||
C8—O1—N2—C10 | −0.4 (2) | C1—C2—C3—C4 | −0.3 (3) |
N2—O1—C8—N1 | −179.39 (17) | C2—C3—C4—Cl1 | 178.75 (15) |
N2—O1—C8—C9 | 0.1 (2) | C2—C3—C4—C5 | −0.6 (3) |
C8—N1—C7—C1 | −179.45 (18) | Cl1—C4—C5—C6 | −178.59 (19) |
C7—N1—C8—O1 | −2.1 (3) | C3—C4—C5—C6 | 0.8 (4) |
C7—N1—C8—C9 | 178.5 (2) | C4—C5—C6—C1 | 0.0 (4) |
O1—N2—C10—C9 | 0.5 (2) | O1—C8—C9—C10 | 0.2 (2) |
O1—N2—C10—C11 | 179.91 (17) | O1—C8—C9—C12 | 178.5 (2) |
C6—C1—C2—C3 | 1.0 (3) | N1—C8—C9—C10 | 179.6 (2) |
C7—C1—C2—C3 | −178.80 (18) | N1—C8—C9—C12 | −2.1 (4) |
C2—C1—C6—C5 | −0.8 (3) | C8—C9—C10—N2 | −0.4 (2) |
C7—C1—C6—C5 | 179.0 (2) | C8—C9—C10—C11 | −179.78 (19) |
C2—C1—C7—N1 | −177.71 (19) | C12—C9—C10—N2 | −178.7 (2) |
C6—C1—C7—N1 | 2.5 (3) | C12—C9—C10—C11 | 1.9 (3) |
Symmetry codes: (i) x−1, y, z−1; (ii) −x, −y, −z; (iii) x−1, y, z; (iv) x+1, y, z; (v) x+2, y, z+1; (vi) x−2, y, z−1; (vii) x+1, y, z+1. |
Cg1 is the centroid of the O1/N2/C10/C9/C8 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O1 | 0.93 | 2.34 | 2.704 (3) | 103 |
C11—H11C···Cg1iv | 0.96 | 2.91 | 3.644 (2) | 134 |
Symmetry code: (iv) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C12H11ClN2O |
Mr | 234.68 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 296 |
a, b, c (Å) | 5.0877 (2), 24.5197 (9), 9.4673 (4) |
β (°) | 94.871 (2) |
V (Å3) | 1176.77 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.30 |
Crystal size (mm) | 0.30 × 0.16 × 0.14 |
Data collection | |
Diffractometer | Bruker KAPPA APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.868, 0.965 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9016, 2112, 1539 |
Rint | 0.030 |
(sin θ/λ)max (Å−1) | 0.600 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.120, 1.07 |
No. of reflections | 2112 |
No. of parameters | 147 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.15, −0.14 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997) and PLATON (Spek, 2009), WinGX (Farrugia, 1999) and PLATON (Spek, 2009).
Cg1 is the centroid of the O1/N2/C10/C9/C8 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O1 | 0.93 | 2.34 | 2.704 (3) | 103 |
C11—H11C···Cg1i | 0.96 | 2.91 | 3.644 (2) | 134 |
Symmetry code: (i) x+1, y, z. |
Acknowledgements
The authors would like to thank the Chemistry Department, King Abdul Aziz University, Jeddah, Saudi Arabia for providing research facilities.
References
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The title compound (Fig. 1) has been prepared in continuation of our work on the synthesis of Schiff bases of 3,4-dimethyisoxazol-5-amine. We have recently reported the crystal structure of N-(4-bromobenzylidene)-3,4-dimethylisoxazol-5-amine (Asiri et al., 2010a), which is isostructural with the title compound.
The crystal structures of 4-chloro-2- [(E)-({4-[N-(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl}iminio) methyl]phenolate (Shad et al., 2008), 4-bromo-2-((E)-{4-[(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl} iminiomethyl)phenolate (Tahir et al., 2008), 2-[(E)-(3,4-dimethylisoxazol-5-yl)iminomethyl]phenol (Fun et al., 2010a), 1-[(E)-(3,4-dimethylisoxazol-5-yl)iminomethyl]-2-naphthol (Fun et al., 2010b) and N-[4-(dimethylamino)benzylidene]-3,4-dimethylisoxazol-5-amine (Asiri et al., 2010b) have also been published previously, which contain the 5-amino-3,4-dimethylisoxazole moiety.
In the title compound, the 4-chlorobenzylidene moiety A (C1—C7/CL1) and 5-amino-3,4-dimethylisoxazole moiety B (N1/C8—C12/N2/O1) are planar with r. m. s. deviation of 0.0042 and 0.0076 Å, respectively. The dihedral angle between A/B is 1.10 (11)°. R. m. s. deviation from the plane of all non-hydrogen atoms in the molecule is 0.0200 Å, with the largest deviation of the CL1 atom [0.0534 (11) Å]. Weak intramolecular H-bonding of C—H···O type (Table 1, Fig. 1) exists and complete an S(5) ring motif (Bernstein et al., 1995). There exists no π···π interaction. The C—H···π interaction (Table 1) play an important role in stabilizing the molecules.