5-Bromo-1H-thieno[2,3-d]imidazole.

Area of Science:

• Organic Chemistry
• Crystallography
• Heterocyclic Chemistry

Background:

• 1H-thieno[2,3-d]imidazole is a heterocyclic compound with potential applications.
• Understanding the regioselectivity of electrophilic substitution is crucial for synthesis.
• Crystal structure analysis provides detailed molecular and intermolecular information.

Purpose of the Study:

• To investigate the bromination of 1H-thieno[2,3-d]imidazole.
• To determine the precise site of bromination using N-bromo-succinimide.
• To elucidate the crystal structure and intermolecular interactions of the brominated product.

Main Methods:

• Synthesis of the title compound via bromination.
• Single-crystal X-ray diffraction for crystal structure determination.
• Analysis of molecular planarity and hydrogen bonding.

Main Results:

• Bromination of 1H-thieno[2,3-d]imidazole with N-bromo-succinimide selectively yields the 5-bromo derivative.
• The molecule is nearly planar, with a mean deviation of 0.015 Å from the least-squares plane.
• Infinite C(4) chains are formed through N-H⋯N hydrogen bonds along the [101] direction in the crystal.

Conclusions:

• The study confirms the regioselective bromination at position 5 of the 1H-thieno[2,3-d]imidazole system.
• The crystal structure reveals a near-planar molecular conformation.
• Intermolecular hydrogen bonding dictates the formation of one-dimensional chains in the solid state.