Thiophene/selenophene-based S-shaped double helicenes: regioselective synthesis and structures

Submitting author affiliation:
Henan University, Kaifeng, China

Beilstein Arch. 2022, 202229. https://doi.org/10.3762/bxiv.2022.29.v1

Published 27 Apr 2022

Preprint
cc-by Logo

Abstract

2,5-Di(trimethylsilanyl)dithieno[2,3-b:3′,2′-d]thiophene ((TMS)2-bb-DTT), 2,5- di(trimethylsilanyl)diseleno[2,3-b:3′,2′-d]thiophene ((TMS)2-bb-DST), and 2,5- di(trimethylsilanyl)diseleno[2,3-b:3′,2′-d] selenophene ((TMS)2-bb-DSS) were used as starting materials to synthesize three S-shaped double helicenes (i. e., DH-1, DH-2, and DH-3) through monobromination, formylation, the Wittig reaction, and double oxidative photocyclization. Photocyclization was a highly regioselective process. The molecular structures of DH-1 and DH-2 were confirmed by X-ray single-crystal analysis. Multiple intermolecular interactions, such as C-S, C-Se, S-S, S-Se, and Se-Se, were observed in the crystal packing structures of these compounds. Spectroscopic results and our previous work showed that the combination of molecular structure change and heteroatom replacement from S to Se could precisely modulate molecular energy levels.

Keywords: thiophene; selenophene; double helicene; regioselective synthesis; crystal structure

Supporting Information

Format: DOCX Size: 10.8 MB   Download
Format: CIF Size: 738.6 KB   Download

How to Cite

When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Wang, M.; Dang, L.; Xu, W.; Ma, Z.; Shao, L.; Wang, G.; Li, C.; Wang, H. Beilstein Arch. 2022, 202229. doi:10.3762/bxiv.2022.29.v1

Download Citation

Citation data can be downloaded as file using the "Download" button or used for copy/paste from the text window below.
Citation data in RIS format can be imported by all major citation management software, including EndNote, ProCite, RefWorks, and Zotero.

OTHER BEILSTEIN-INSTITUT OPEN SCIENCE ACTIVITIES