organic compounds
1-{3-(4-Chlorophenyl)-5-[4-(propan-2-yl)phenyl]-4,5-dihydro-1H-pyrazol-1-yl}ethanone
aDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India, bDepartment of Studies in Chemistry, Industrial Chemistry Section, Mangalore University, Mangalagangotri 574 199, India, and cDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA
*Correspondence e-mail: jjasinski@keene.edu
In the title compound, C20H21ClN2O, the dihedral angles between the pyrazole ring (r.m.s. deviation = 0.049 Å) and the benzene and chlorobenzene rings are 84.65 (10) and 3.35 (10)°, respectively. In the crystal, inversion dimers linked by pairs of weak C—H⋯O interactions generate R22(16) loops. Weak π–π stacking interactions [centroid–centroid distance = 3.8490 (11) Å] are also observed.
CCDC reference: 1007161
Related literature
For background to pyrazolines, see: Manna et al. (2005); Samshuddin et al. (2012). For a related structure, see: Jasinski et al. (2010).
Experimental
Crystal data
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Data collection: CrysAlis PRO (Agilent, 2012); cell CrysAlis PRO; data reduction: CrysAlis RED (Agilent, 2012); program(s) used to solve structure: SUPERFLIP (Palatinus et al., 2012); program(s) used to refine structure: SHELXL2012 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2.
Supporting information
CCDC reference: 1007161
https://doi.org/10.1107/S1600536814013348/hb7234sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536814013348/hb7234Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536814013348/hb7234Isup3.cml
To a mixture of (2E)-1-(4-chlorophenyl)-3-[4-(propan-2-yl) phenyl] prop-2-en-1-one (2.85g, 0.01 mol) and hydrazine hydrate (0.5mL, 0.01 mol) in 25 mL acetic acid was refluxed for 9h (Fig. 3). The reaction mixture was cooled and poured into ice-cold water. The precipitate formed was collected by filtration and purified by recrystallization from ethanol. Colourless, irregular, crystals were grown from ethanol solution by the slow evaporation method (m.p.: 389–391 K).
All of the H atoms were placed in their calculated positions and then refined using the riding model with Atom—H lengths of 0.95 - 1.00Å (CH), 0.99Å (CH2) or 0.98Å (CH3). Isotropic displacement parameters for these atoms were set to 1.2 (CH, CH2) or 1.5 (CH3) times Ueq of the parent atom. Idealised Me refined as a rotating group.
Pyrazoline derivatives possess many biological activities such as anticancer (Manna et al., 2005) and antioxidant properties (Samshuddin et al., 2012). As part of our ongoing studies in this area (Jasinski et al., 2010), we now describe the structure of the title compound, C20H21ClN2O.
The dihedral angle between the mean planes of the phenyl rings is 81.3 (0)° while the pyrazole ring is separated from each of the phenyl rings by 3.3 (5)° (C5–C10) and 84.6 (5)° (C11–C16), respectively (Fig. 1). In the crystal, a weak C—H···O intermolecular interaction between the phenyl ring and the ethanone group is observed forming dimers in an R22(16) ring-set motif stacked along the ab plane (Fig. 2). In addition, weak π–π intermolecular stacking interactions (Cg1–Cg3 = 3.8490 (11)Å, x, y, z, Cg1: N1/N2/C2/C3/C4; Cg3: C11–C16) are present.
For background to pyrazolines, see: Manna et al. (2005); Samshuddin et al. (2012). For a related structure, see: Jasinski et al. (2010).
Data collection: CrysAlis PRO (Agilent, 2012); cell
CrysAlis PRO (Agilent, 2012); data reduction: CrysAlis RED (Agilent, 2012); program(s) used to solve structure: SUPERFLIP (Palatinus et al., 2012); program(s) used to refine structure: SHELXL2012 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009).C20H21ClN2O | Z = 2 |
Mr = 340.84 | F(000) = 360 |
Triclinic, P1 | Dx = 1.299 Mg m−3 |
a = 6.4836 (6) Å | Cu Kα radiation, λ = 1.54184 Å |
b = 9.6524 (9) Å | Cell parameters from 2061 reflections |
c = 14.439 (1) Å | θ = 4.7–71.3° |
α = 81.178 (7)° | µ = 2.00 mm−1 |
β = 89.720 (7)° | T = 173 K |
γ = 77.488 (8)° | Irregular, colourless |
V = 871.35 (13) Å3 | 0.44 × 0.22 × 0.12 mm |
Agilent Eos Gemini diffractometer | 3287 independent reflections |
Radiation source: Enhance (Cu) X-ray Source | 2770 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.030 |
Detector resolution: 16.0416 pixels mm-1 | θmax = 71.3°, θmin = 4.8° |
ω scans | h = −7→7 |
Absorption correction: multi-scan (CrysAlis PRO and CrysAlis RED; Agilent, 2012) | k = −11→11 |
Tmin = 0.552, Tmax = 1.000 | l = −17→13 |
5081 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.049 | H-atom parameters constrained |
wR(F2) = 0.142 | w = 1/[σ2(Fo2) + (0.0831P)2 + 0.1082P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
3287 reflections | Δρmax = 0.39 e Å−3 |
220 parameters | Δρmin = −0.30 e Å−3 |
0 restraints |
C20H21ClN2O | γ = 77.488 (8)° |
Mr = 340.84 | V = 871.35 (13) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.4836 (6) Å | Cu Kα radiation |
b = 9.6524 (9) Å | µ = 2.00 mm−1 |
c = 14.439 (1) Å | T = 173 K |
α = 81.178 (7)° | 0.44 × 0.22 × 0.12 mm |
β = 89.720 (7)° |
Agilent Eos Gemini diffractometer | 3287 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO and CrysAlis RED; Agilent, 2012) | 2770 reflections with I > 2σ(I) |
Tmin = 0.552, Tmax = 1.000 | Rint = 0.030 |
5081 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.142 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.39 e Å−3 |
3287 reflections | Δρmin = −0.30 e Å−3 |
220 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
Cl1 | −0.38093 (9) | 0.20917 (6) | −0.11269 (4) | 0.0519 (2) | |
O1 | 0.7663 (2) | 0.28686 (15) | 0.34910 (10) | 0.0410 (4) | |
N1 | 0.5281 (2) | 0.23124 (16) | 0.25819 (10) | 0.0274 (3) | |
N2 | 0.4029 (2) | 0.26002 (16) | 0.17744 (10) | 0.0281 (3) | |
C1 | 0.6681 (3) | 0.31158 (19) | 0.27431 (14) | 0.0312 (4) | |
C2 | 0.4721 (3) | 0.11838 (19) | 0.33008 (12) | 0.0270 (4) | |
H2 | 0.4340 | 0.1587 | 0.3892 | 0.032* | |
C3 | 0.2714 (3) | 0.0933 (2) | 0.28392 (12) | 0.0296 (4) | |
H3A | 0.2847 | −0.0094 | 0.2789 | 0.036* | |
H3B | 0.1441 | 0.1262 | 0.3196 | 0.036* | |
C4 | 0.2629 (3) | 0.18369 (18) | 0.18828 (12) | 0.0270 (4) | |
C5 | 0.1068 (3) | 0.18983 (19) | 0.11335 (12) | 0.0286 (4) | |
C6 | 0.0992 (3) | 0.2857 (2) | 0.02914 (13) | 0.0367 (4) | |
H6 | 0.1983 | 0.3456 | 0.0193 | 0.044* | |
C7 | −0.0529 (3) | 0.2928 (2) | −0.03959 (14) | 0.0398 (5) | |
H7 | −0.0602 | 0.3586 | −0.0962 | 0.048* | |
C8 | −0.1938 (3) | 0.2031 (2) | −0.02500 (14) | 0.0357 (4) | |
C9 | −0.1890 (3) | 0.1079 (2) | 0.05667 (14) | 0.0353 (4) | |
H9 | −0.2875 | 0.0474 | 0.0657 | 0.042* | |
C10 | −0.0374 (3) | 0.1018 (2) | 0.12568 (13) | 0.0310 (4) | |
H10 | −0.0325 | 0.0362 | 0.1823 | 0.037* | |
C11 | 0.6507 (3) | −0.01311 (17) | 0.35070 (11) | 0.0238 (4) | |
C12 | 0.7114 (3) | −0.10535 (19) | 0.28520 (12) | 0.0281 (4) | |
H12 | 0.6388 | −0.0860 | 0.2261 | 0.034* | |
C13 | 0.8759 (3) | −0.22467 (19) | 0.30517 (13) | 0.0291 (4) | |
H13 | 0.9145 | −0.2856 | 0.2592 | 0.035* | |
C14 | 0.9860 (3) | −0.25741 (18) | 0.39120 (12) | 0.0264 (4) | |
C15 | 0.9230 (3) | −0.16548 (19) | 0.45676 (12) | 0.0294 (4) | |
H15 | 0.9934 | −0.1859 | 0.5164 | 0.035* | |
C16 | 0.7603 (3) | −0.04536 (19) | 0.43676 (12) | 0.0281 (4) | |
H16 | 0.7227 | 0.0162 | 0.4824 | 0.034* | |
C17 | 1.1712 (3) | −0.38433 (19) | 0.41496 (13) | 0.0310 (4) | |
H17 | 1.1640 | −0.4224 | 0.4831 | 0.037* | |
C18 | 1.3796 (3) | −0.3346 (2) | 0.40136 (17) | 0.0429 (5) | |
H18A | 1.3855 | −0.2630 | 0.4420 | 0.064* | |
H18B | 1.3885 | −0.2919 | 0.3358 | 0.064* | |
H18C | 1.4982 | −0.4172 | 0.4176 | 0.064* | |
C19 | 1.1692 (3) | −0.5078 (2) | 0.36083 (17) | 0.0432 (5) | |
H19A | 1.1930 | −0.4775 | 0.2944 | 0.065* | |
H19B | 1.0319 | −0.5347 | 0.3672 | 0.065* | |
H19C | 1.2813 | −0.5905 | 0.3861 | 0.065* | |
C20 | 0.6915 (3) | 0.4311 (2) | 0.19747 (15) | 0.0405 (5) | |
H20A | 0.8279 | 0.4566 | 0.2055 | 0.061* | |
H20B | 0.5770 | 0.5151 | 0.2004 | 0.061* | |
H20C | 0.6847 | 0.3993 | 0.1365 | 0.061* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0532 (4) | 0.0469 (3) | 0.0508 (3) | 0.0024 (3) | −0.0251 (3) | −0.0103 (2) |
O1 | 0.0397 (8) | 0.0346 (8) | 0.0482 (8) | −0.0092 (6) | −0.0126 (7) | −0.0028 (6) |
N1 | 0.0275 (8) | 0.0219 (7) | 0.0303 (8) | −0.0028 (6) | −0.0031 (6) | −0.0005 (6) |
N2 | 0.0270 (8) | 0.0227 (7) | 0.0318 (8) | −0.0004 (6) | −0.0019 (6) | −0.0023 (6) |
C1 | 0.0268 (9) | 0.0221 (8) | 0.0428 (11) | −0.0001 (7) | 0.0004 (8) | −0.0062 (7) |
C2 | 0.0247 (9) | 0.0246 (8) | 0.0295 (9) | −0.0022 (7) | 0.0013 (7) | −0.0014 (7) |
C3 | 0.0219 (8) | 0.0311 (9) | 0.0320 (9) | −0.0020 (7) | −0.0002 (7) | 0.0018 (7) |
C4 | 0.0231 (8) | 0.0231 (8) | 0.0311 (9) | 0.0024 (7) | 0.0025 (7) | −0.0035 (7) |
C5 | 0.0262 (9) | 0.0262 (9) | 0.0301 (9) | 0.0014 (7) | 0.0005 (7) | −0.0050 (7) |
C6 | 0.0410 (11) | 0.0344 (10) | 0.0332 (10) | −0.0085 (9) | −0.0002 (8) | −0.0009 (8) |
C7 | 0.0470 (12) | 0.0364 (10) | 0.0313 (10) | −0.0023 (9) | −0.0053 (9) | −0.0002 (8) |
C8 | 0.0330 (10) | 0.0325 (10) | 0.0377 (10) | 0.0050 (8) | −0.0082 (8) | −0.0108 (8) |
C9 | 0.0310 (10) | 0.0327 (10) | 0.0410 (10) | −0.0025 (8) | −0.0024 (8) | −0.0082 (8) |
C10 | 0.0274 (9) | 0.0281 (9) | 0.0343 (9) | −0.0005 (7) | 0.0002 (7) | −0.0030 (7) |
C11 | 0.0220 (8) | 0.0203 (8) | 0.0282 (8) | −0.0037 (7) | 0.0006 (7) | −0.0022 (6) |
C12 | 0.0288 (9) | 0.0278 (9) | 0.0268 (8) | −0.0050 (7) | −0.0029 (7) | −0.0033 (7) |
C13 | 0.0313 (9) | 0.0254 (9) | 0.0313 (9) | −0.0039 (7) | 0.0037 (7) | −0.0094 (7) |
C14 | 0.0237 (8) | 0.0206 (8) | 0.0340 (9) | −0.0041 (7) | 0.0025 (7) | −0.0026 (7) |
C15 | 0.0305 (9) | 0.0277 (9) | 0.0277 (9) | −0.0026 (7) | −0.0054 (7) | −0.0028 (7) |
C16 | 0.0305 (9) | 0.0245 (8) | 0.0283 (9) | −0.0027 (7) | 0.0004 (7) | −0.0061 (7) |
C17 | 0.0279 (9) | 0.0246 (9) | 0.0371 (10) | −0.0006 (7) | 0.0026 (8) | −0.0019 (7) |
C18 | 0.0279 (10) | 0.0339 (10) | 0.0636 (14) | −0.0024 (8) | −0.0021 (9) | −0.0036 (10) |
C19 | 0.0379 (11) | 0.0246 (9) | 0.0647 (14) | 0.0023 (8) | 0.0018 (10) | −0.0126 (9) |
C20 | 0.0400 (11) | 0.0263 (9) | 0.0536 (13) | −0.0074 (8) | 0.0014 (9) | −0.0006 (9) |
Cl1—C8 | 1.744 (2) | C11—C12 | 1.395 (2) |
O1—C1 | 1.221 (2) | C11—C16 | 1.393 (2) |
N1—N2 | 1.381 (2) | C12—H12 | 0.9500 |
N1—C1 | 1.357 (2) | C12—C13 | 1.384 (2) |
N1—C2 | 1.489 (2) | C13—H13 | 0.9500 |
N2—C4 | 1.282 (2) | C13—C14 | 1.394 (3) |
C1—C20 | 1.505 (3) | C14—C15 | 1.395 (2) |
C2—H2 | 1.0000 | C14—C17 | 1.516 (2) |
C2—C3 | 1.546 (2) | C15—H15 | 0.9500 |
C2—C11 | 1.514 (2) | C15—C16 | 1.382 (2) |
C3—H3A | 0.9900 | C16—H16 | 0.9500 |
C3—H3B | 0.9900 | C17—H17 | 1.0000 |
C3—C4 | 1.510 (2) | C17—C18 | 1.531 (3) |
C4—C5 | 1.471 (3) | C17—C19 | 1.524 (3) |
C5—C6 | 1.405 (3) | C18—H18A | 0.9800 |
C5—C10 | 1.387 (3) | C18—H18B | 0.9800 |
C6—H6 | 0.9500 | C18—H18C | 0.9800 |
C6—C7 | 1.386 (3) | C19—H19A | 0.9800 |
C7—H7 | 0.9500 | C19—H19B | 0.9800 |
C7—C8 | 1.383 (3) | C19—H19C | 0.9800 |
C8—C9 | 1.376 (3) | C20—H20A | 0.9800 |
C9—H9 | 0.9500 | C20—H20B | 0.9800 |
C9—C10 | 1.389 (3) | C20—H20C | 0.9800 |
C10—H10 | 0.9500 | ||
N2—N1—C2 | 113.23 (13) | C16—C11—C2 | 120.39 (15) |
C1—N1—N2 | 122.58 (15) | C16—C11—C12 | 117.85 (15) |
C1—N1—C2 | 123.64 (15) | C11—C12—H12 | 119.5 |
C4—N2—N1 | 108.69 (14) | C13—C12—C11 | 120.92 (16) |
O1—C1—N1 | 120.05 (17) | C13—C12—H12 | 119.5 |
O1—C1—C20 | 122.85 (18) | C12—C13—H13 | 119.3 |
N1—C1—C20 | 117.09 (17) | C12—C13—C14 | 121.44 (16) |
N1—C2—H2 | 109.5 | C14—C13—H13 | 119.3 |
N1—C2—C3 | 100.98 (14) | C13—C14—C15 | 117.33 (16) |
N1—C2—C11 | 112.19 (14) | C13—C14—C17 | 123.21 (16) |
C3—C2—H2 | 109.5 | C15—C14—C17 | 119.44 (16) |
C11—C2—H2 | 109.5 | C14—C15—H15 | 119.3 |
C11—C2—C3 | 114.97 (15) | C16—C15—C14 | 121.43 (16) |
C2—C3—H3A | 111.2 | C16—C15—H15 | 119.3 |
C2—C3—H3B | 111.2 | C11—C16—H16 | 119.5 |
H3A—C3—H3B | 109.2 | C15—C16—C11 | 121.02 (16) |
C4—C3—C2 | 102.59 (15) | C15—C16—H16 | 119.5 |
C4—C3—H3A | 111.2 | C14—C17—H17 | 107.3 |
C4—C3—H3B | 111.2 | C14—C17—C18 | 110.08 (15) |
N2—C4—C3 | 114.03 (16) | C14—C17—C19 | 114.25 (16) |
N2—C4—C5 | 121.42 (16) | C18—C17—H17 | 107.3 |
C5—C4—C3 | 124.53 (16) | C19—C17—H17 | 107.3 |
C6—C5—C4 | 120.82 (17) | C19—C17—C18 | 110.38 (16) |
C10—C5—C4 | 120.14 (16) | C17—C18—H18A | 109.5 |
C10—C5—C6 | 119.03 (17) | C17—C18—H18B | 109.5 |
C5—C6—H6 | 120.0 | C17—C18—H18C | 109.5 |
C7—C6—C5 | 119.98 (19) | H18A—C18—H18B | 109.5 |
C7—C6—H6 | 120.0 | H18A—C18—H18C | 109.5 |
C6—C7—H7 | 120.3 | H18B—C18—H18C | 109.5 |
C8—C7—C6 | 119.40 (19) | C17—C19—H19A | 109.5 |
C8—C7—H7 | 120.3 | C17—C19—H19B | 109.5 |
C7—C8—Cl1 | 119.34 (16) | C17—C19—H19C | 109.5 |
C9—C8—Cl1 | 118.93 (17) | H19A—C19—H19B | 109.5 |
C9—C8—C7 | 121.73 (18) | H19A—C19—H19C | 109.5 |
C8—C9—H9 | 120.6 | H19B—C19—H19C | 109.5 |
C8—C9—C10 | 118.71 (19) | C1—C20—H20A | 109.5 |
C10—C9—H9 | 120.6 | C1—C20—H20B | 109.5 |
C5—C10—C9 | 121.13 (18) | C1—C20—H20C | 109.5 |
C5—C10—H10 | 119.4 | H20A—C20—H20B | 109.5 |
C9—C10—H10 | 119.4 | H20A—C20—H20C | 109.5 |
C12—C11—C2 | 121.76 (15) | H20B—C20—H20C | 109.5 |
Cl1—C8—C9—C10 | 178.96 (14) | C3—C4—C5—C6 | 174.73 (17) |
N1—N2—C4—C3 | 2.3 (2) | C3—C4—C5—C10 | −4.4 (3) |
N1—N2—C4—C5 | −179.36 (14) | C4—C5—C6—C7 | −178.18 (17) |
N1—C2—C3—C4 | 6.52 (17) | C4—C5—C10—C9 | 178.66 (16) |
N1—C2—C11—C12 | −69.6 (2) | C5—C6—C7—C8 | −1.1 (3) |
N1—C2—C11—C16 | 110.32 (18) | C6—C5—C10—C9 | −0.5 (3) |
N2—N1—C1—O1 | 175.76 (16) | C6—C7—C8—Cl1 | −178.48 (15) |
N2—N1—C1—C20 | −3.2 (3) | C6—C7—C8—C9 | 0.8 (3) |
N2—N1—C2—C3 | −6.06 (18) | C7—C8—C9—C10 | −0.3 (3) |
N2—N1—C2—C11 | 116.86 (15) | C8—C9—C10—C5 | 0.2 (3) |
N2—C4—C5—C6 | −3.5 (3) | C10—C5—C6—C7 | 0.9 (3) |
N2—C4—C5—C10 | 177.42 (16) | C11—C2—C3—C4 | −114.46 (16) |
C1—N1—N2—C4 | −169.07 (16) | C11—C12—C13—C14 | 0.3 (3) |
C1—N1—C2—C3 | 165.62 (16) | C12—C11—C16—C15 | −0.5 (3) |
C1—N1—C2—C11 | −71.5 (2) | C12—C13—C14—C15 | 0.4 (3) |
C2—N1—N2—C4 | 2.71 (19) | C12—C13—C14—C17 | −178.11 (16) |
C2—N1—C1—O1 | 4.8 (3) | C13—C14—C15—C16 | −1.1 (3) |
C2—N1—C1—C20 | −174.12 (16) | C13—C14—C17—C18 | 98.9 (2) |
C2—C3—C4—N2 | −5.9 (2) | C13—C14—C17—C19 | −26.0 (2) |
C2—C3—C4—C5 | 175.76 (15) | C14—C15—C16—C11 | 1.1 (3) |
C2—C11—C12—C13 | 179.65 (16) | C15—C14—C17—C18 | −79.6 (2) |
C2—C11—C16—C15 | 179.65 (16) | C15—C14—C17—C19 | 155.55 (18) |
C3—C2—C11—C12 | 45.1 (2) | C16—C11—C12—C13 | −0.2 (3) |
C3—C2—C11—C16 | −135.05 (17) | C17—C14—C15—C16 | 177.47 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15···O1i | 0.95 | 2.44 | 3.364 (2) | 165 |
Symmetry code: (i) −x+2, −y, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15···O1i | 0.95 | 2.44 | 3.364 (2) | 165 |
Symmetry code: (i) −x+2, −y, −z+1. |
Acknowledgements
BN thanks the UGC for financial assistance through a BSR one-time grant for the purchase of chemicals. VVS thanks the DST for financial assistance through a PURSE grant. JPJ acknowledges the NSF–MRI program (grant No. CHE-1039027) for funds to purchase the X-ray diffractometer.
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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.
Pyrazoline derivatives possess many biological activities such as anticancer (Manna et al., 2005) and antioxidant properties (Samshuddin et al., 2012). As part of our ongoing studies in this area (Jasinski et al., 2010), we now describe the structure of the title compound, C20H21ClN2O.
The dihedral angle between the mean planes of the phenyl rings is 81.3 (0)° while the pyrazole ring is separated from each of the phenyl rings by 3.3 (5)° (C5–C10) and 84.6 (5)° (C11–C16), respectively (Fig. 1). In the crystal, a weak C—H···O intermolecular interaction between the phenyl ring and the ethanone group is observed forming dimers in an R22(16) ring-set motif stacked along the ab plane (Fig. 2). In addition, weak π–π intermolecular stacking interactions (Cg1–Cg3 = 3.8490 (11)Å, x, y, z, Cg1: N1/N2/C2/C3/C4; Cg3: C11–C16) are present.