Reactions de germylenes avec des heterocycles a trois chainons. Mise en evidence d'especes tricoordinees du germanium R2Ge=X (X = O, S) et de nouveaux germylenes fonctionnels
Condensations of complexed dialkylgermylenes R2Ge · NEt3 with various oxiranes and thiirane gave, by insertion and ring expansion, the corresponding oxa- and thia-germacyclobutanes . These thermally unstable heterocycles led via β-eliminations to transient dialkylgermanones and germathiones which, by insertion into oxirane and thiirane (excess) formed germadioxolanes and germadithiolanes.
Synthesis and Characterization of Novel Ionic Liquids: N-Substituted Aziridinium Salts
作者:Martin B. Duriska、Joseph Grondin、Laurent Servant、Marc Birot、Hervé Deleuze
DOI:10.1002/jhet.876
日期:2012.5
Ionic liquids based on three‐membered ring aziridinium cations have been synthesized for the first time using a straightforward synthetic route. N‐butyl‐N‐methylaziridinium bis(trifluoromethanesulfonyl)imide, N‐propyl‐N‐ethylaziridinium bis(trifluoromethanesulfonyl)imide, N‐butyl‐N‐[2‐(2‐methoxyethoxy)ethyl]aziridinium bis(trifluoromethanesulfonyl)imide, N‐butyl‐N‐methylaziridinium dicyanamide, and
A series of heterodinuclear acylpalladium-cobalt complexes having a bidentate nitrogen ligand, L-2(RCO)Pd-Co(CO)(4) (L-2 = bpy, R = Me (5), Ph (6); L-2 = tmeda, R = Me (7), Ph (8); L-2 = phen, R = Me (9), Ph (10)) are prepared by metathetical reactions of PdRIL2 with Na+[Co(CO)(4)](-) followed by treatment with CO. These complexes are characterized by NMR and IR spectroscopies and elemental analyses, and the molecular structures of 6, 8, and 9 are determined by X-ray structure analysis. Geometry at Pd is essentially square planar and the Cc atom is considered to have d(10) tetrahedral structure, where cobalt(-I) anion coordinates to palladium(II) cation. Heterodinuclear organopalladium-cobalt complexes are shown to catalyze copolymerization of aziridines and CO under mild conditions. Reaction of (dppe)MePd-Co(CO)(4) (1) with aziridine gives a cationic (aziridine)palladium(II) complex with [CO(CO)(4)](-) anion, [PdMe(aziridine)(dppe)](+)[CO(CO)(4)](-) (13). (c) 2006 Elsevier B.V. All rights reserved.