Three-membered cyclic digermylenes stabilised by an N-heterocyclic carbene† † Electronic supplementary information (ESI) available. CCDC 1893832–1893834. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/d1sc00956g

ABSTRACT: Treatment of potassium salts of silole dianions with donor stabilised germanium dichlorides gave the anticipated silagermafulvenylidenes R2Si = Ge(Do) (R2Si = 1-silacyclopentadiendiyl, Do = N-heterocyclic carbene (NHC)) only as transient intermediates in a side reaction. They were detected by NMR spectroscopy and, in one case, the formal dimer, 2,4-disila-1λ3,3λ3-digermetane, was isolated. The main products of these reactions are sila-bis-λ3-germiranes, i.e. directly interconnected digermylenes that are part of a three-membered ring. The structural data, supported by the results of density functional calculations confirm the digermylene nature of these products with a long inner cyclic Ge–Ge bond that decreases the inherent high ring strain in silagermiranes. The reaction of silole dianions with NHC stabilised germanium dichloride affords 3-sila-1l3,2l3-digermiranes, three-membered ring compounds that are directly interconnected digermylenes.

SUBMITTER: Dong Z 

PROVIDER: S-EPMC8115106 | biostudies-literature |

REPOSITORIES: biostudies-literature