Structure of a functionalized tetrahydrobenzothiophene

Area of Science:

• Organic Chemistry
• Crystallography
• Solid-State Chemistry

Background:

• Sulfur-containing heterocycles are important in medicinal chemistry.
• Understanding the solid-state structure of organic molecules informs their physical properties and reactivity.

Purpose of the Study:

• To elucidate the crystal structure of (+-)-4-(tert-Butyldimethylsiloxy)-3a,4,7,7a-tetrahydrobenzo[b]thiophen-3(2H)-one 1,1-dioxide.
• To analyze the molecular conformation, intramolecular interactions, and intermolecular packing.

Main Methods:

• Single-crystal X-ray diffraction analysis.
• Data collection using Mo K alpha radiation.
• Structure solution and refinement.

Main Results:

• The molecule crystallizes in the monoclinic space group P2(1)/n.
• The fused ring system exhibits cis-fusion with cyclohexene in a half-chair and thiophene in an envelope conformation.
• Enlarged endocyclic bond angles at bridgehead carbons (C3a, C7a) were observed.
• Close intramolecular contacts (C3...O11, O10...O11, O10...C7) were identified.
• Adjacent molecules form stacks with carbonyl groups interacting via C...O contacts.

Conclusions:

• The crystal structure provides detailed insights into the stereochemistry and conformation of this thiophene derivative.
• The observed intramolecular and intermolecular interactions influence the molecule's solid-state arrangement.