Home Physical Sciences Crystal structure of methyl 2-amino-3-chloro-4-methoxybenzoate, C9H10ClNO3
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Crystal structure of methyl 2-amino-3-chloro-4-methoxybenzoate, C9H10ClNO3

  • Defeng Kong , Hongjuan Tong ORCID logo , Bin Liu ORCID logo and Wenqiang Tang ORCID logo EMAIL logo
Published/Copyright: June 18, 2025

Abstract

C9H10ClNO3, monoclinic, P21 (no. 4), a = 10.677(2) Å, b = 4.0074(8) Å, c = 11.866(2) Å, β = 112.108(6)°, V = 470.37(17) Å3, Z = 2, R gt (F) = 0.0515 wR ref (F 2) = 0.1258, T = 183 K.

CCDC no.: 2445565

The molecular structure is shown in the figure. Table 1 contains the crystallographic data and the list of the atoms including atomic coordinates and displacement parameters can be found in the cif-file attached to this article.

Table 1:

Data collection and handling.

Crystal: Colourless block
Size: 0.15 × 0.08 × 0.05 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.39 mm−1
Diffractometer, scan mode: Bruker APEX-II, φ and ω scans
θ max, completeness: 25.5°, 100 %
N(hkl)measured , N(hkl)unique, R int: 5155, 1661, 0.083
Criterion for I obs, N(hkl)gt: I obs > 2 σ(I obs), 1,352
N(param)refined: 130
Programs: Bruker, 1 SHELX, 2 , 3 Olex2 4

1 Source of materials

Methyl 2-amino-4-methoxybenzoate (5.0 g, 27.6 mmol) and N-chlorosuccinimide (4.4 g, 33.1 mmol) were added to N,N-dimethylformamide (100 mL) separately, and the reaction system was stirred at 5 °C for 16 h. After the reaction was completed, monitored by TLC, the mixture was diluted with water (100 mL) and extracted with ethyl acetate (3 × 60 mL). The organic phase was washed with brine (3 × 60 mL), dried with anhydrous sulfate, and the solvent was evaporated under reduced pressure to obtain the crude product. The crude product was further purified by flash silica chromatography to afford a single crystal of high quality. For crystal growth, the crude product was dissolved in a minimal amount of hot ethanol and slowly cooled to room temperature. 1H NMR (400 MHz, DMSO-d6): δ 7.77 (d, J = 9.0 Hz, 1H), 6.76 (brs, 2H), 6.47 (d, J = 9.0 Hz, 1H), 3.88 (s, 3H), 3.80 (s, 3H). 13C NMR (100 MHz, DMSO-d6) δ 167.66, 159.27, 148.45, 131.29, 105.83, 104.81, 100.42, 56.72, 52.07.

2 Experimental details

The crystal structure was solved by Direct Methods using SHELXT 2 and refined with SHELXL 3 within the Olex2 software suite. 4 Non-hydrogen atoms were refined anisotropically to model thermal displacement parameters, while hydrogen atoms were placed at idealized positions with geometrical constraints.

3 Comment

Chlorine- and amino-substituted benzoic acids and their derivatives have significant applications in pharmaceutical research and coordination complex materials development. 5 , 6 , 7 , 8

The title compound exhibits a substituted benzene ring bearing four distinct functional groups: an amino (–NH2) group at C6, a chlorine atom at C7, a methoxy (–OCH3) group at C2, and a methyl ester (–COOCH3) group at C5. Bond length analysis reveals characteristic structural features: the C5–C8 bond of the ester moiety measures 1.465(8) Å, consistent with typical C–O single bonds in esters. The shortened C6–N1 bond (1.366(7) Å) suggests partial double-bond character arising from resonance interactions between the amino group and aromatic system. 9 , 10 The C7–Cl1 bond length (1.727(7) Å) aligns with standard C–Cl covalent bonds (1.72–1.76 Å).

Notably, all non-hydrogen atoms lie within a near-perfect plane (maximum deviation < 0.03 Å), indicating extensive conjugation across the aromatic system and ester group. This planar conformation is further supported by the near-linear geometry of the ester group (C5–C8–O3–O2 = 179.2°).

The crystal packing mechanism is dominated by weak intermolecular forces, with face-to-face π–π stacking interactions between adjacent benzene rings and van der Waals contacts.


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: The projects of Social Development in Shaanxi Province Science and Technology Department

Award Identifier / Grant number: 2023-YBSF-036

Funding source: The 2024 Key Scientific Research Program Projects of the Shaanxi Provincial Department of Education (Key Laboratory Projects)

Award Identifier / Grant number: 24JS004

Funding source: The 2023 research and development project of the Xianyang Science and Technology Bureau

Award Identifier / Grant number: L2023-ZDYF-SF-030

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

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

Funding source: School-level Scientific and Technological Innovation Team for Design, Synthesis and Structural Modification of Drug Molecules

Award Identifier / Grant number: 2024KCTD04

  1. Research funding: This work was financially supported by the projects of Social Development in Shaanxi Province Science and Technology Department (2023-YBSF-036), the projects of Natural Science Foundation of Shannxi Province (2025JC–YBMS-1076), the 2024 Key Scientific Research Program Projects of the Shaanxi Provincial Department of Education (Key Laboratory Projects, 24JS004), the 2023 research and development project of the Xianyang Science and Technology Bureau (L2023-ZDYF-SF-030), Key Laboratory of Molecular Imaging and Drug Synthesis of Xianyang city (2021QXNL-PT-0008), School-level Scientific and Technological Innovation Team for Design, Synthesis and Structural Modification of Drug Molecules (2024KCTD04).

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Received: 2025-05-02
Accepted: 2025-06-04
Published Online: 2025-06-18
Published in Print: 2025-08-26

© 2025 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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