Boron-chalcogen heterocycles and linear tetraboranes from a cyclic tetra(amino)tetraborane.
basic_science · Level V
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- Record sourced from PubMed, PMID 40506450.
- Also identified by DOI 10.1038/s41467-025-60549-z and PMC identifier 12163077.
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Abstract
While small carbocyclic rings have long been recognized as pivotal building blocks in chemistry, their all-boron counterparts have remained largely unexplored. In this work, we present a detailed account of the functionalization reactivity of our cyclic tetraborane B<sub>4</sub>(NCy<sub>2</sub>)<sub>4</sub> (Cy = cyclohexyl) encompassing both ring-expansion and ring-opening reactions. Specifically, diphenyl dichalcogenides effect ring expansion to five-membered B<sub>4</sub>E rings (E = S, Se, Te), while halogenating agents induce ring opening to generate linear tetraboranes with halide end groups. These transformations reveal reactivity patterns reminiscent of strained organic ring systems, thus highlighting the cyclic tetraborane's potential as a versatile precursor for synthesizing intricate boron-rich architectures.