organic compounds
(E)-1-(Naphthalen-1-yl)-3-(1-phenyl-1H-pyrazol-4-yl)prop-2-en-1-one
aChemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia, bCenter of Excellence for Advanced Materials Research, King Abdulaziz University, PO Box 80203 Jeddah, Saudi Arabia, and cDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: seikweng@um.edu.my
In the title molecule, C22H16N2O, the phenyl ring is twisted slightly with respect to the plane of the central pyrazole ring [dihedral angle = 14.8 (2)°]; the central ring is connected to the naphthyl ring through a —CH=CH—C(=O)— fragment, whose C=C double bond has an E configuration. The pyrazole ring and naphthalene ring system are twisted by 46.3 (1)°. Weak intermolecular C—H⋯O hydrogen bonds link the molecules, forming supramolecular chains running along the a axis. The crystal studied was a non-merohedral twin with a component ratio of 0.544 (2):0.456 (2).
Related literature
For related structures; see: Diánez & López-Castro (1990); Jones et al. (1984). For the synthesis, see: Finar (1961); Finar & Lord (1959); Jones et al. (1984).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis PRO (Agilent, 2010); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S1600536811035124/xu5313sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811035124/xu5313Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811035124/xu5313Isup3.cml
1-Phenylpyrazole-4-carboxaldehyde (0.01 mol) in ethanol (20 ml) was added to a 1-acetylnaphthalene (0.01 mol) in dissolved in 20% ethanolic potassium hydroxide (20 ml). The mixture was stirred for 6 h. The mixture was then poured into water (200 ml). The precipitated product was collected by filtration, washed with water, dried and recrystallized from ethanol; m.p. 389–391 K.
Carbon- and nitrogen-bound H-atoms were placed in calculated positions [C–H 0.95, Uiso(H) 1.2Ueq(C)] and were included in the
in the riding model approximation.The crystal is a non-merohedral twin; integration of the diffraction spots gave a ratio of 0.539: 0.461 for the 8472 reflections, most of which were overlapped. Of the isolated spots, the Rint of the major component was 0.017 and that of the minor component was 0.021. The ratio refined to 0.544 (2): 0.456.
Omitted were (1 - 5 5), (-4 - 5 -8) and (-4 - 6 -8).
The hydrogen of the acetyl group of 1-acetylnaphthalene (as well as that of similar ketones) is relatively acidic, and can be abstracted by a strong base. In the present study, the resulting carbanion is used for carbon-carbon double-bond synthesis to extend the nature of the substitutent at the 4-position of 1-phenylpyrazole-4-carboxaldehyde by using a similar procedure for synthesizing the 1-phenyl-3-(1-phenyl-1H-pyrazol-4-yl)prop-2-en-1-one (Finar, 1961; Finar & Lord, 1959). In the C22H16N2O molecule (Scheme I), the phenyl ring is slightly twisted with respect to the central pyrazole; the central ring is connected to the naphthyl ring through the –CH–CH–C(═O)– fragment, whose C–C double-bond is of an E-configuration (Fig. 1). The pyrazole and naphthalene rings are twisted by 46.3 (1) °. There are only few reports of 4-substituted 1-phenylpyrazoles (Diánez López-Castro, 1990; Jones et al., 1984).
For related structures; see: Diánez & López-Castro (1990); Jones et al. (1984). For the synthesis, see: Finar (1961); Finar & Lord (1959); Jones et al. (1984).
Data collection: CrysAlis PRO (Agilent, 2010); cell
CrysAlis PRO (Agilent, 2010); data reduction: CrysAlis PRO (Agilent, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. Thermal ellipsoid plot (Barbour, 2001) of C22H16N2O at the 70% probability level; hydrogen atoms are drawn as spheres of arbitrary radius. |
C22H16N2O | F(000) = 680 |
Mr = 324.37 | Dx = 1.342 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 1183 reflections |
a = 5.8457 (6) Å | θ = 2.5–27.5° |
b = 10.322 (2) Å | µ = 0.08 mm−1 |
c = 26.626 (2) Å | T = 100 K |
β = 92.322 (9)° | Prism, colorless |
V = 1605.3 (4) Å3 | 0.25 × 0.10 × 0.10 mm |
Z = 4 |
Agilent SuperNova Dual diffractometer with an Atlas detector | 3825 independent reflections |
Radiation source: SuperNova (Cu) X-ray Source | 2494 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.105 |
Detector resolution: 10.4041 pixels mm-1 | θmax = 27.5°, θmin = 2.5° |
ω scans | h = −5→7 |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | k = −13→13 |
Tmin = 0.980, Tmax = 0.992 | l = −34→33 |
3824 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)] = 0.060 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.140 | H-atom parameters constrained |
S = 0.96 | w = 1/[σ2(Fo2) + (0.0432P)2] where P = (Fo2 + 2Fc2)/3 |
3825 reflections | (Δ/σ)max = 0.001 |
227 parameters | Δρmax = 0.31 e Å−3 |
0 restraints | Δρmin = −0.34 e Å−3 |
C22H16N2O | V = 1605.3 (4) Å3 |
Mr = 324.37 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 5.8457 (6) Å | µ = 0.08 mm−1 |
b = 10.322 (2) Å | T = 100 K |
c = 26.626 (2) Å | 0.25 × 0.10 × 0.10 mm |
β = 92.322 (9)° |
Agilent SuperNova Dual diffractometer with an Atlas detector | 3825 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2010) | 2494 reflections with I > 2σ(I) |
Tmin = 0.980, Tmax = 0.992 | Rint = 0.105 |
3824 measured reflections |
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.140 | H-atom parameters constrained |
S = 0.96 | Δρmax = 0.31 e Å−3 |
3825 reflections | Δρmin = −0.34 e Å−3 |
227 parameters |
x | y | z | Uiso*/Ueq | ||
O1 | 1.1745 (4) | 0.6128 (2) | 0.63013 (9) | 0.0283 (5) | |
N1 | 0.4987 (4) | 0.2604 (2) | 0.49661 (10) | 0.0202 (6) | |
N2 | 0.3221 (4) | 0.3061 (2) | 0.52392 (10) | 0.0229 (6) | |
C1 | 0.4623 (5) | 0.1552 (3) | 0.46241 (11) | 0.0213 (7) | |
C2 | 0.2589 (5) | 0.0852 (3) | 0.46313 (12) | 0.0243 (7) | |
H2 | 0.1425 | 0.1097 | 0.4851 | 0.029* | |
C3 | 0.2277 (6) | −0.0202 (3) | 0.43169 (13) | 0.0305 (8) | |
H3 | 0.0889 | −0.0679 | 0.4320 | 0.037* | |
C4 | 0.3976 (6) | −0.0571 (3) | 0.39953 (13) | 0.0293 (8) | |
H4 | 0.3767 | −0.1305 | 0.3783 | 0.035* | |
C5 | 0.5974 (6) | 0.0145 (3) | 0.39896 (13) | 0.0303 (8) | |
H5 | 0.7139 | −0.0095 | 0.3769 | 0.036* | |
C6 | 0.6297 (5) | 0.1211 (3) | 0.43018 (12) | 0.0271 (7) | |
H6 | 0.7669 | 0.1702 | 0.4293 | 0.032* | |
C7 | 0.7000 (5) | 0.3184 (3) | 0.51010 (12) | 0.0225 (7) | |
H7 | 0.8446 | 0.3016 | 0.4964 | 0.027* | |
C8 | 0.6552 (5) | 0.4065 (3) | 0.54748 (12) | 0.0220 (7) | |
C9 | 0.4192 (5) | 0.3936 (3) | 0.55371 (12) | 0.0247 (7) | |
H9 | 0.3375 | 0.4432 | 0.5771 | 0.030* | |
C10 | 0.8217 (5) | 0.4858 (3) | 0.57469 (12) | 0.0257 (7) | |
H10 | 0.9746 | 0.4815 | 0.5640 | 0.031* | |
C11 | 0.7837 (5) | 0.5642 (3) | 0.61324 (11) | 0.0200 (7) | |
H11 | 0.6309 | 0.5792 | 0.6227 | 0.024* | |
C12 | 0.9745 (5) | 0.6283 (3) | 0.64149 (12) | 0.0226 (7) | |
C13 | 0.9159 (5) | 0.7116 (3) | 0.68505 (12) | 0.0220 (7) | |
C14 | 0.7203 (5) | 0.7865 (3) | 0.67969 (13) | 0.0265 (7) | |
H14 | 0.6237 | 0.7780 | 0.6503 | 0.032* | |
C15 | 0.6629 (6) | 0.8752 (3) | 0.71719 (14) | 0.0336 (8) | |
H15 | 0.5319 | 0.9290 | 0.7124 | 0.040* | |
C16 | 0.7945 (6) | 0.8842 (3) | 0.76025 (14) | 0.0325 (8) | |
H16 | 0.7533 | 0.9443 | 0.7853 | 0.039* | |
C17 | 0.9905 (6) | 0.8066 (3) | 0.76865 (12) | 0.0260 (7) | |
C18 | 1.1253 (7) | 0.8148 (3) | 0.81331 (14) | 0.0367 (9) | |
H18 | 1.0838 | 0.8748 | 0.8384 | 0.044* | |
C19 | 1.3144 (6) | 0.7390 (3) | 0.82175 (13) | 0.0358 (9) | |
H19 | 1.4046 | 0.7474 | 0.8521 | 0.043* | |
C20 | 1.3740 (6) | 0.6488 (3) | 0.78517 (13) | 0.0321 (8) | |
H20 | 1.5023 | 0.5938 | 0.7914 | 0.038* | |
C21 | 1.2500 (5) | 0.6390 (3) | 0.74068 (13) | 0.0269 (7) | |
H21 | 1.2941 | 0.5774 | 0.7164 | 0.032* | |
C22 | 1.0581 (5) | 0.7185 (3) | 0.73024 (12) | 0.0232 (7) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0241 (13) | 0.0340 (13) | 0.0269 (13) | −0.0001 (10) | 0.0011 (10) | −0.0068 (10) |
N1 | 0.0224 (13) | 0.0212 (13) | 0.0169 (13) | 0.0039 (11) | −0.0013 (11) | 0.0008 (11) |
N2 | 0.0248 (14) | 0.0259 (14) | 0.0180 (13) | 0.0068 (11) | −0.0010 (12) | −0.0021 (11) |
C1 | 0.0264 (17) | 0.0190 (15) | 0.0182 (15) | 0.0081 (13) | −0.0043 (14) | −0.0012 (13) |
C2 | 0.0281 (17) | 0.0203 (15) | 0.0243 (17) | 0.0061 (13) | 0.0003 (15) | −0.0022 (14) |
C3 | 0.0350 (19) | 0.0213 (17) | 0.034 (2) | 0.0003 (15) | −0.0087 (17) | 0.0008 (15) |
C4 | 0.040 (2) | 0.0213 (16) | 0.0260 (18) | 0.0082 (15) | −0.0087 (17) | −0.0038 (14) |
C5 | 0.0303 (19) | 0.0343 (18) | 0.0262 (18) | 0.0151 (15) | 0.0015 (16) | −0.0036 (15) |
C6 | 0.0308 (18) | 0.0257 (16) | 0.0243 (17) | 0.0051 (14) | −0.0051 (15) | −0.0047 (14) |
C7 | 0.0186 (15) | 0.0247 (17) | 0.0240 (18) | 0.0050 (13) | −0.0031 (14) | 0.0012 (14) |
C8 | 0.0243 (16) | 0.0208 (15) | 0.0209 (17) | 0.0049 (13) | −0.0018 (14) | 0.0026 (13) |
C9 | 0.0295 (18) | 0.0253 (17) | 0.0190 (17) | 0.0091 (14) | −0.0010 (15) | −0.0015 (14) |
C10 | 0.0234 (17) | 0.0271 (17) | 0.0263 (17) | 0.0053 (14) | −0.0013 (14) | 0.0013 (15) |
C11 | 0.0207 (17) | 0.0202 (15) | 0.0189 (16) | 0.0027 (12) | −0.0004 (14) | 0.0022 (13) |
C12 | 0.0293 (18) | 0.0156 (15) | 0.0227 (17) | −0.0010 (13) | −0.0017 (15) | 0.0066 (13) |
C13 | 0.0279 (17) | 0.0151 (14) | 0.0231 (17) | −0.0014 (13) | 0.0036 (15) | 0.0019 (13) |
C14 | 0.0313 (19) | 0.0242 (16) | 0.0240 (17) | 0.0035 (14) | −0.0009 (15) | −0.0048 (14) |
C15 | 0.038 (2) | 0.0252 (17) | 0.039 (2) | 0.0107 (15) | 0.0073 (18) | −0.0052 (15) |
C16 | 0.045 (2) | 0.0214 (17) | 0.032 (2) | 0.0010 (15) | 0.0120 (18) | −0.0088 (15) |
C17 | 0.0391 (19) | 0.0186 (16) | 0.0206 (17) | −0.0092 (14) | 0.0054 (16) | −0.0031 (13) |
C18 | 0.059 (2) | 0.0261 (18) | 0.0253 (18) | −0.0112 (17) | 0.0028 (19) | −0.0022 (15) |
C19 | 0.054 (2) | 0.0307 (19) | 0.0216 (18) | −0.0105 (17) | −0.0101 (18) | 0.0035 (16) |
C20 | 0.037 (2) | 0.0273 (18) | 0.0319 (19) | −0.0010 (15) | −0.0035 (17) | 0.0036 (15) |
C21 | 0.0312 (18) | 0.0214 (16) | 0.0281 (18) | −0.0047 (13) | 0.0027 (16) | 0.0014 (14) |
C22 | 0.0295 (18) | 0.0165 (15) | 0.0238 (16) | −0.0066 (13) | 0.0036 (15) | 0.0034 (13) |
O1—C12 | 1.230 (4) | C10—H10 | 0.9500 |
N1—C7 | 1.355 (4) | C11—C12 | 1.477 (4) |
N1—N2 | 1.370 (3) | C11—H11 | 0.9500 |
N1—C1 | 1.428 (4) | C12—C13 | 1.494 (4) |
N2—C9 | 1.316 (4) | C13—C14 | 1.383 (4) |
C1—C6 | 1.373 (4) | C13—C22 | 1.436 (4) |
C1—C2 | 1.392 (4) | C14—C15 | 1.405 (4) |
C2—C3 | 1.380 (4) | C14—H14 | 0.9500 |
C2—H2 | 0.9500 | C15—C16 | 1.358 (5) |
C3—C4 | 1.391 (5) | C15—H15 | 0.9500 |
C3—H3 | 0.9500 | C16—C17 | 1.408 (5) |
C4—C5 | 1.383 (5) | C16—H16 | 0.9500 |
C4—H4 | 0.9500 | C17—C18 | 1.402 (5) |
C5—C6 | 1.387 (4) | C17—C22 | 1.436 (4) |
C5—H5 | 0.9500 | C18—C19 | 1.366 (5) |
C6—H6 | 0.9500 | C18—H18 | 0.9500 |
C7—C8 | 1.381 (4) | C19—C20 | 1.402 (4) |
C7—H7 | 0.9500 | C19—H19 | 0.9500 |
C8—C9 | 1.402 (4) | C20—C21 | 1.367 (5) |
C8—C10 | 1.444 (4) | C20—H20 | 0.9500 |
C9—H9 | 0.9500 | C21—C22 | 1.409 (4) |
C10—C11 | 1.334 (4) | C21—H21 | 0.9500 |
C7—N1—N2 | 111.8 (2) | C10—C11—H11 | 119.4 |
C7—N1—C1 | 127.6 (3) | C12—C11—H11 | 119.4 |
N2—N1—C1 | 120.3 (2) | O1—C12—C11 | 121.5 (3) |
C9—N2—N1 | 103.9 (2) | O1—C12—C13 | 121.1 (3) |
C6—C1—C2 | 120.4 (3) | C11—C12—C13 | 117.4 (3) |
C6—C1—N1 | 120.1 (3) | C14—C13—C22 | 120.4 (3) |
C2—C1—N1 | 119.4 (3) | C14—C13—C12 | 117.1 (3) |
C3—C2—C1 | 119.5 (3) | C22—C13—C12 | 122.4 (3) |
C3—C2—H2 | 120.2 | C13—C14—C15 | 120.7 (3) |
C1—C2—H2 | 120.2 | C13—C14—H14 | 119.6 |
C2—C3—C4 | 120.6 (3) | C15—C14—H14 | 119.6 |
C2—C3—H3 | 119.7 | C16—C15—C14 | 120.0 (3) |
C4—C3—H3 | 119.7 | C16—C15—H15 | 120.0 |
C5—C4—C3 | 119.0 (3) | C14—C15—H15 | 120.0 |
C5—C4—H4 | 120.5 | C15—C16—C17 | 121.7 (3) |
C3—C4—H4 | 120.5 | C15—C16—H16 | 119.2 |
C4—C5—C6 | 120.8 (3) | C17—C16—H16 | 119.2 |
C4—C5—H5 | 119.6 | C18—C17—C16 | 121.7 (3) |
C6—C5—H5 | 119.6 | C18—C17—C22 | 118.8 (3) |
C1—C6—C5 | 119.6 (3) | C16—C17—C22 | 119.5 (3) |
C1—C6—H6 | 120.2 | C19—C18—C17 | 121.9 (3) |
C5—C6—H6 | 120.2 | C19—C18—H18 | 119.1 |
N1—C7—C8 | 107.1 (3) | C17—C18—H18 | 119.1 |
N1—C7—H7 | 126.5 | C18—C19—C20 | 119.2 (3) |
C8—C7—H7 | 126.5 | C18—C19—H19 | 120.4 |
C7—C8—C9 | 103.8 (3) | C20—C19—H19 | 120.4 |
C7—C8—C10 | 126.2 (3) | C21—C20—C19 | 120.9 (3) |
C9—C8—C10 | 129.9 (3) | C21—C20—H20 | 119.6 |
N2—C9—C8 | 113.3 (3) | C19—C20—H20 | 119.6 |
N2—C9—H9 | 123.3 | C20—C21—C22 | 121.2 (3) |
C8—C9—H9 | 123.3 | C20—C21—H21 | 119.4 |
C11—C10—C8 | 126.9 (3) | C22—C21—H21 | 119.4 |
C11—C10—H10 | 116.6 | C21—C22—C17 | 117.9 (3) |
C8—C10—H10 | 116.6 | C21—C22—C13 | 124.4 (3) |
C10—C11—C12 | 121.2 (3) | C17—C22—C13 | 117.5 (3) |
C7—N1—N2—C9 | 0.7 (3) | O1—C12—C13—C14 | 142.2 (3) |
C1—N1—N2—C9 | 175.1 (2) | C11—C12—C13—C14 | −38.7 (4) |
C7—N1—C1—C6 | −15.4 (4) | O1—C12—C13—C22 | −35.7 (4) |
N2—N1—C1—C6 | 171.1 (3) | C11—C12—C13—C22 | 143.4 (3) |
C7—N1—C1—C2 | 162.6 (3) | C22—C13—C14—C15 | 3.1 (5) |
N2—N1—C1—C2 | −10.9 (4) | C12—C13—C14—C15 | −174.8 (3) |
C6—C1—C2—C3 | 0.9 (5) | C13—C14—C15—C16 | −2.9 (5) |
N1—C1—C2—C3 | −177.1 (3) | C14—C15—C16—C17 | 0.3 (5) |
C1—C2—C3—C4 | 0.2 (5) | C15—C16—C17—C18 | −179.4 (3) |
C2—C3—C4—C5 | −1.0 (5) | C15—C16—C17—C22 | 2.0 (5) |
C3—C4—C5—C6 | 0.5 (5) | C16—C17—C18—C19 | 179.5 (3) |
C2—C1—C6—C5 | −1.3 (4) | C22—C17—C18—C19 | −1.9 (5) |
N1—C1—C6—C5 | 176.6 (3) | C17—C18—C19—C20 | −1.1 (5) |
C4—C5—C6—C1 | 0.6 (5) | C18—C19—C20—C21 | 2.2 (5) |
N2—N1—C7—C8 | −0.4 (3) | C19—C20—C21—C22 | −0.3 (5) |
C1—N1—C7—C8 | −174.4 (3) | C20—C21—C22—C17 | −2.6 (5) |
N1—C7—C8—C9 | 0.0 (3) | C20—C21—C22—C13 | −178.3 (3) |
N1—C7—C8—C10 | 176.8 (3) | C18—C17—C22—C21 | 3.7 (4) |
N1—N2—C9—C8 | −0.7 (3) | C16—C17—C22—C21 | −177.7 (3) |
C7—C8—C9—N2 | 0.4 (4) | C18—C17—C22—C13 | 179.6 (3) |
C10—C8—C9—N2 | −176.2 (3) | C16—C17—C22—C13 | −1.7 (4) |
C7—C8—C10—C11 | −174.8 (3) | C14—C13—C22—C21 | 174.9 (3) |
C9—C8—C10—C11 | 1.1 (6) | C12—C13—C22—C21 | −7.3 (5) |
C8—C10—C11—C12 | 172.8 (3) | C14—C13—C22—C17 | −0.8 (4) |
C10—C11—C12—O1 | 0.8 (5) | C12—C13—C22—C17 | 177.0 (3) |
C10—C11—C12—C13 | −178.3 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C9—H9···O1i | 0.95 | 2.46 | 3.397 (4) | 167 |
Symmetry code: (i) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C22H16N2O |
Mr | 324.37 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 100 |
a, b, c (Å) | 5.8457 (6), 10.322 (2), 26.626 (2) |
β (°) | 92.322 (9) |
V (Å3) | 1605.3 (4) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.25 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Agilent SuperNova Dual diffractometer with an Atlas detector |
Absorption correction | Multi-scan (CrysAlis PRO; Agilent, 2010) |
Tmin, Tmax | 0.980, 0.992 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 3824, 3825, 2494 |
Rint | 0.105 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.140, 0.96 |
No. of reflections | 3825 |
No. of parameters | 227 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.31, −0.34 |
Computer programs: CrysAlis PRO (Agilent, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour, 2001), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
C9—H9···O1i | 0.95 | 2.46 | 3.397 (4) | 167 |
Symmetry code: (i) x−1, y, z. |
Acknowledgements
We thank King Abdulaziz University and the University of Malaya for supporting this study.
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The hydrogen of the acetyl group of 1-acetylnaphthalene (as well as that of similar ketones) is relatively acidic, and can be abstracted by a strong base. In the present study, the resulting carbanion is used for carbon-carbon double-bond synthesis to extend the nature of the substitutent at the 4-position of 1-phenylpyrazole-4-carboxaldehyde by using a similar procedure for synthesizing the 1-phenyl-3-(1-phenyl-1H-pyrazol-4-yl)prop-2-en-1-one (Finar, 1961; Finar & Lord, 1959). In the C22H16N2O molecule (Scheme I), the phenyl ring is slightly twisted with respect to the central pyrazole; the central ring is connected to the naphthyl ring through the –CH–CH–C(═O)– fragment, whose C–C double-bond is of an E-configuration (Fig. 1). The pyrazole and naphthalene rings are twisted by 46.3 (1) °. There are only few crystal structure reports of 4-substituted 1-phenylpyrazoles (Diánez López-Castro, 1990; Jones et al., 1984).