lithium-bis(trimethylsilyl)amide has been researched along with tetrahydrofuran* in 2 studies
2 other study(ies) available for lithium-bis(trimethylsilyl)amide and tetrahydrofuran
| Article | Year |
|---|---|
Lithium Hexamethyldisilazide-Mediated Enolization of Acylated Oxazolidinones: Solvent, Cosolvent, and Isotope Effects on Competing Monomer- and Dimer-Based Pathways.
Lithium hexamethyldisilazide (LiHMDS)-mediated enolization of (+)-4-benzyl-3-propionyl-2-oxazolidinone in THF-hydrocarbon mixtures shows unusual sensitivity to the choice of hydrocarbon cosolvent (hexane versus toluene) and to isotopic labeling. Four mechanisms corresponding to monosolvated monomers, trisolvated dimers, octasolvated monomers, and octasolvated dimers were identified. Even under conditions in which the LiHMDS monomer was the dominant observable form, dimer-based metalation was significant. The mechanism-dependent isotope and cosolvent effects are discussed in the context of ground-state stabilization and transition-state tunneling. Topics: Acylation; Furans; Hexanes; Isotope Labeling; Lithium Compounds; Molecular Structure; Oxazolidinones; Silanes; Solvents; Toluene | 2017 |
Living polymerization via anionic initiation for the synthesis of well-defined PPV materials.
The anionic polymerization of PPV via the sulfinyl precursor route is further investigated. When LHMDS is employed as the base to form the actively propagating quinodimethane system and THF as the solvent, anionic polymerizations can be observed. With the use of tert- butyl-substituted anionic initiators, specific functional groups can be built in the polymer chain and the chain length can be efficiently controlled, which is demonstrated here for the first time. With introduction of branched side chains on the aromatic core, soluble conjugated PPV material can be obtained with molecular weights in the range of 5000-16,000 g mol(-1). Topics: Furans; Lithium Compounds; Molecular Structure; Molecular Weight; Polymerization; Polyvinyls; Silanes | 2012 |