Home The crystal structure of 1,3,5-tris(dibromomethyl)benzene, C9H6Br6
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The crystal structure of 1,3,5-tris(dibromomethyl)benzene, C9H6Br6

  • Chao-Bo Yang , Jia-Lu Chen , Tian-Yu Zhang and Kai-Long Zhong ORCID logo EMAIL logo
Published/Copyright: December 29, 2023

Abstract

C9H6Br6, hexagonal, P63/m (no. 176), a = 8.8911(3) Å, c = 10.6847(5) Å, V = 731.48(6) Å3, Z = 2, R gt (F) = 0.0441, wR ref (F2) = 0.1094, T = 293 K.

CCDC no.: 2314064

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: Colorless needle
Size: 0.35 × 0.15 × 0.12 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 16.4 mm−1
Diffractometer, scan mode: Bruker Smart Apex, φ and ω
θmax, completeness: 27.5°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 6752, 593, 0.049
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 508
N(param)refined: 28
Programs: Bruker [1], SHELX [2, 3]
Table 2:

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

Atom x y z Uiso*/Ueq
Br1 −0.09994 (9) 0.63741 (11) 0.89771 (6) 0.0478 (3)
C1 0.2856 (12) 0.7929 (10) 0.7500 0.0339 (19)
H1A 0.2534 0.8776 0.7500 0.041*
C2 0.1596 (10) 0.6186 (11) 0.7500 0.037 (2)
C3 −0.0323 (11) 0.5583 (12) 0.7500 0.0336 (18)
H3A −0.0964 0.4310 0.7500 0.040*

1 Source of material

All chemicals were obtained from commercial sources and were used as purchased. A mixture of 1,3,5-trimethylbenzene (2.1 mL, 15 mmol), N-bromosuccinimide (16.0 g 90 mmol), dibenzoyl peroxide (0.72 g, 3 mmol) and benzene (120 mL) was stirred at 80 °C for 30 min. After refluxing under nitrogen for 4 h, the solution was allowed to cool and was filtered. The organic phase was concentrated under reduced pressure, then the crude products were purified by flash column chromatography. Colorless needle crystals of the title compound were obtained by slow evaporation of a solution in ethanol/hexane at room temperature. 1 H NMR (500 MHz, Chloroform-d): δ 7.75.08 (s, 3H), 6.66 (s, 3H).

2 Experimental details

Data were integrated by using the Saint program [1], absorption corrections were applied using Sadabs program [1], the structure was solved with the SHELXS-2014 [2] program and refined with the SHELXL-2018 [3] software package. H atoms bound to C and N atoms were positioned geometrically and allowed to ride on their parent atoms, with C–H = 0.93 Å (phenyl) or 0.98 Å (methyl) and Uiso(H) = 1.2Ueq(C).

3 Comment

Benzyl bromide moieties are prominent skeletons that are ubiquitous in natural products, bioactive molecules, and pharmaceuticals [4], [5], [6]. Bromide chemistry has been recognized as one of the most attractive functionalities in organic synthesis [7], [8], [9], [10]. 1,3,5-Tris(dibromomethyl)benzene is widely used in organic reactions but difficult to synthesize [11]. Therefore, synthesizing the tris(dibromomethyl)benzene and conducting subsequent derivative applications is of great significance.

Single-crystal structure analysis revealed that the title compound crystallized in the hexagonal space group, the asymmetric unit consists of one-sixth 1,3,5-tris(dibromomethyl)benzene molecule. The C–Br bond length is 1.942(5) Å and the Br–C–Br angle is 108.7(4)°, these results are similar to that observed in a previously reported dibromomethyl-substituted benzene compounds, namely 1,3-dibromo-5-(dibromomethyl)benzene, 1,4-dibromo-2,5-bis(bromomethyl)benzene, 1,4-dibromo-2-(dibromomethyl)benzene, 1,2-bis(dibromomethyl)benzene, 1-(bromomethyl)-2-(dibromomethyl)benzene and 1,3-bis(dibromomethyl)benzene [6]. The 1,3,5-tris(dibromomethyl)benzene molecule lies on a mirror plane and a threefold rotation axis. The planes defined the terminal dibromomethyl groups (C3/Br/Br iii and C3 i /Br i /Br vi , C3 ii /Br ii /Br vii ) [symmetry codes: (i) −y + 1, x − y + 1, z; (ii) −x + y, -x + 1, z; (iii) x, y, −z + 3/2; (vi) −y + 1, x − y + 1, −z + 3/2; (vii) −x + y, -x + 1, −z + 3/2] and the least-squares plane of the central benzene ring is perpendicular. The dihedral angles between pairs of symmetric terminal imidazole rings are 60.0° between C3/Br/Br iii and C3 i /Br i /Br vi , C3/Br/Br iii and C3 ii /Br ii /Br vii , and C3 i /Br i /Br vi and C3 ii /Br ii /Br vii . In the solid state structure, numerous weak C3–H3A⋯Br1 iv and C3–H3A⋯Br1 iv [symmetry codes: (iv) −x + y − 1, −x, z; (v) −x + y − 1, −x, −z + 3/2] hydrogen-bonding interactions result in a two-dimensional supramolecular layer extending in the ab plane. Within the sheet, the R ( 9 ) 3 3 and the R ( 21 ) 3 3 motifs can be discerned.


Corresponding author: Kai-Long Zhong, School of Life and Health, Nanjing Polytechnic Institute, Nanjing, 210048, People’s Republic of China, E-mail:

  1. Author contributions: 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 Key Scientific Research Foundation of Nanjing Polytechnic Institute (No. NJPI-2022-04), Innovation and Entrepreneurship Cultivation Project for Vocational Students in Jiangsu Province.

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

References

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Received: 2023-11-11
Accepted: 2023-12-13
Published Online: 2023-12-29
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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