Ligand-protected strain-free diarylgermylenes

Citation
Gl. Wegner et al., Ligand-protected strain-free diarylgermylenes, ORGANOMETAL, 20(3), 2001, pp. 418-423
Citations number
47
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
0276-7333 → ACNP
Volume
20
Issue
3
Year of publication
2001
Pages
418 - 423
Database
ISI
SICI code
0276-7333(20010205)20:3<418:LSD>2.0.ZU;2-Y
Abstract
Reaction of 2 molar equiv of 2,6-di(1'-naphthyl)phenyllithium with bis[bis( trimethylsilyl)-amino]germylene afforded the red, crystalline, stable bis[2 ,6-bis(1-naphthyl)phenyl]germylene [(bisap)(2)Ge, 6] in good yield. The str ucture of the solvate 6.C6H6 was determined by single-crystal X-ray methods . The molecule features a largely strain-free conformation with a C-Ge-C an gle of 102.72(9)degrees and Ge-C distances of 2.036(2) and 2.030(2) Angstro m. These parameters are very close to those calculated for the diphenylgerm ylene prototype by ab initio methods [101.6; 2.006 Angstrom]. The two new w ing-like 2,6-di(1-naphthyl)phenyl substituents appear to protect the germyl ene center of 6 in a very efficient way without inducing destabilizing dist ortions. Bis[2,4,6-triphenylphenyl] germylene [(triph)(2)Ge, 1] was also pr epared. Germylenes 1 and 6 were oxidized to yellow products of the composit ion (triph)(2)GeO (2) and (bisap)(2)GeO (7), respectively. The compounds ha ve been characterized by their mass spectra, which show the parent ions in full accordance with the proposed formulas.