English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Abstract  The exhaustive trichlorosilylation of hexachloro‐1,3‐butadiene was achieved in one step by using a mixture of Si 2 Cl 6  and [ n Bu 4 N]Cl (7:2 equiv) as the silylation reagent. The corresponding butadiene dianion salt [ n Bu 4 N] 2 [ 1 ] was isolated in 36 % yield after recrystallization. The negative charges of [ 1 ] 2−  are mainly delocalized across its two carbanionic (Cl 3 Si) 2 C termini (α‐effect of silicon) such that the central bond possesses largely C=C double‐bond character. Upon treatment with 4 equiv of HCl, [ 1 ] 2−  is converted into neutral 1,2,3,4‐tetrakis(trichlorosilyl)but‐2‐ene,  3 . The Cl −  acceptor AlCl 3 , induces a twofold ring‐closure reaction of [ 1 ] 2−  to form a six‐membered bicycle  4  in which two silacyclobutene rings are fused along a shared C=C double bond (84 %). Compound  4 , which was structurally characterized by X‐ray crystallography, undergoes partial ring opening to a monocyclic silacyclobutene  2  in the presence of HCl, but is thermally stable up to at least 180 °C.

Building up Strain in One Step: Synthesis of an Edge‐Fused Double Silacyclobutene from an Extensively Trichlorosilylated Butadiene Dianion