Home Crystal structure of 2-((2,6-dichloro-4-(3,5-dimethylisoxazol-4-yl)phenyl)amino)benzoic acid, C18H14Cl2N2O3
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Crystal structure of 2-((2,6-dichloro-4-(3,5-dimethylisoxazol-4-yl)phenyl)amino)benzoic acid, C18H14Cl2N2O3

  • Xiaolin Dang , Kai Zhang , Xiaohua Li , Yanrong Gao and Wenqiang Tang ORCID logo EMAIL logo
Published/Copyright: November 29, 2023

Abstract

C18H14Cl2N2O3, monoclinic, C2/c (no. 15), a = 26.989(7) Å, b = 8.414(2) Å, c = 14.642(4) Å, β = 99.651(8)°, V = 3300.7(16) Å3, Z = 8, Rgt(F) = 0.0636, wRref(F2) = 0.1877, T = 205 K.

CCDC no.: 2292589

The molecular structure is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal: Colourless plate
Size: 0.20 × 0.15 × 0.04 mm
Wavelength: MoKα radiation (0.71073 Å)
μ: 0.41 mm−1
Diffractometer, scan mode: Bruker APEX-II, φ and ω
θmax, completeness: 25.0°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 9401, 2889, 0.125
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 1510
N(param)refined: 229
Programs: Bruker [1], Shelx [2, 3], Olex2 [4]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

Atom x y z Uiso*/Ueq
C1 0.4335 (2) 0.6966 (7) 0.6288 (4) 0.0309 (14)
C2 0.4140 (2) 0.5327 (7) 0.6351 (4) 0.0266 (14)
C3 0.4473 (2) 0.4059 (7) 0.6541 (4) 0.0327 (15)
H3 0.481883 0.425164 0.659455 0.039*
C4 0.4304 (2) 0.2539 (7) 0.6651 (4) 0.0337 (15)
H4 0.453194 0.169797 0.676818 0.040*
C5 0.3798 (2) 0.2255 (7) 0.6589 (4) 0.0287 (14)
H5 0.368090 0.122190 0.668105 0.034*
C6 0.3462 (2) 0.3483 (7) 0.6393 (3) 0.0265 (14)
H6 0.311811 0.326821 0.635430 0.032*
C7 0.3620 (2) 0.5041 (7) 0.6249 (4) 0.0256 (13)
C8 0.2769 (2) 0.6123 (6) 0.5966 (4) 0.0230 (13)
C9 0.2477 (2) 0.5190 (6) 0.5314 (4) 0.0232 (13)
C10 0.1965 (2) 0.5046 (6) 0.5311 (4) 0.0251 (13)
H10 0.178281 0.436718 0.488347 0.030*
C11 0.17167 (19) 0.5897 (6) 0.5934 (4) 0.0217 (12)
C12 0.2000 (2) 0.6915 (6) 0.6545 (3) 0.0232 (13)
H12 0.184010 0.754256 0.695269 0.028*
C13 0.2503 (2) 0.7010 (6) 0.6559 (3) 0.0224 (13)
C14 0.1178 (2) 0.5730 (7) 0.5957 (3) 0.0231 (13)
C15 0.0892 (2) 0.4344 (7) 0.5971 (4) 0.0273 (13)
C16 0.1039 (2) 0.2634 (7) 0.5945 (4) 0.0340 (15)
H16A 0.082593 0.200777 0.629509 0.051*
H16B 0.138376 0.251589 0.621131 0.051*
H16C 0.100213 0.226737 0.531247 0.051*
C17 0.0838 (2) 0.6943 (7) 0.6002 (4) 0.0273 (14)
C18 0.0883 (2) 0.8701 (7) 0.6014 (4) 0.0330 (15)
H18A 0.058394 0.916551 0.568751 0.049*
H18B 0.117064 0.901302 0.571699 0.049*
H18C 0.092493 0.907348 0.664565 0.049*
Cl1 0.28355 (6) 0.82706 (19) 0.73495 (10) 0.0376 (5)
Cl2 0.27573 (5) 0.41963 (17) 0.44736 (9) 0.0302 (4)
N1 0.32906 (16) 0.6263 (6) 0.6005 (3) 0.0293 (12)
H1A 0.341273 0.717739 0.586730 0.035*
N2 0.04187 (18) 0.4677 (6) 0.6034 (3) 0.0315 (12)
O1 0.48246 (15) 0.7027 (5) 0.6237 (4) 0.0509 (13)
H1 0.491556 0.796879 0.623104 0.076*
O2 0.40875 (15) 0.8180 (5) 0.6292 (3) 0.0449 (12)
O3 0.03788 (15) 0.6353 (5) 0.6045 (3) 0.0396 (11)

1 Source of materials

A mixture of methyl 2-((2,6-dichloro-4-(3,5-dimethylisoxazol-4-yl)phenyl)amino)benzoate (3.9 g, 10 mmol), H2O (10 mL), and sodium hydroxide (1.6 g, 40 mmol) was stirred in tetrahydrofuran (30 mL) at 40 °C for 2 h. The reaction was monitored by thin-layer chromatography. The solution was concentrated and diluted with water, and the pH was adjusted to six by adding hydrochloric acid (4 mol/L). The mixture was extracted with ethyl acetate and washed with brine. The organic layer was concentrated under reduced pressure, and the residue was purified by column chromatography using dichloromethane and methanol (20:1, v/v). Crystals of the title compound were obtained by slow evaporation of the aforementioned mixed solution at room temperature after a week.

2 Experimental details

The data were processed using Bruker Saint software [1]. Hydrogen atoms were placed in idealized positions. The structure was solved using Shelxt [2] and refined using Shelxl [3] in Olex2 software [4].

3 Comment

Diphenylamine (DPA) and its derivatives are widely employed as stabilizers for nitrocellulose-based explosives and propellants. They are also utilized as antioxidants in the fragrance industry as well as in the rubber and elastomer sectors [5, 6]. In the present study, a number of relevant single crystal structures have been documented [7], [8], [9], [10].

In the crystal structure of the titled compound, the two phenyl rings are non-planar, with a dihedral angle of 71.6°. The isoxazole five-membered ring forms dihedral angles of 42° and 75.2° with the two phenyl rings, respectively. Intramolecular hydrogen bonding (N1–H1A–O2) is observed between the oxygen atom of the carboxyl group and the hydrogen atom of the amino group, with a bond length of 2.04 Å and a bond angle of 130.2°. This results in a slight torsional twist between the carboxyl and amino groups, with a torsion angle of 15° for N1–C7–C1–O2. These structures exhibit similarities to those documented in the literature [811].

Intermolecular interactions between molecules do not involve significant hydrogen bonding or p–p interactions.


Corresponding author: Wenqiang Tang, Xianyang Key Laboratory of Molecular Imaging and Drug Synthesis, School of Pharmacy, Shaanxi Institute of International Trade & Commerce, Xianyang, Shaanxi, China, E-mail:

Funding source: Key Laboratory of Molecular Imaging and Drug Synthesis of Xianyang City

Award Identifier / Grant number: 2021QXNL–PT-0008

Funding source: Scientific Research Plan Project of Shaanxi Provincial Department of Education

Award Identifier / Grant number: 22JK0279, 23JK0328

Funding source: Key Research and Development Project of Shaanxi Provincial Science and Technology Department

Award Identifier / Grant number: 2023–YBSF-036

Funding source: Youth Innovation Team of Shaanxi University 2023

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was financially supported by the projects of Key Laboratory of Molecular Imaging and Drug Synthesis of Xianyang City (2021QXNL–PT-0008), the Scientific Research Plan Project of Shaanxi Provincial Department of Education (22JK0279, 23JK0328), the Key Research and Development Project of Shaanxi Provincial Science and Technology Department (2023–YBSF-036) and the Youth Innovation Team of Shaanxi University 2023 – “Key technology development and application innovation team of the industrialization of traditional Chinese medicine with northwest characteristics”.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

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Received: 2023-10-23
Accepted: 2023-11-18
Published Online: 2023-11-29
Published in Print: 2024-02-26

© 2023 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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