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Showing 1 to 20 of 25 for “"alkyllithium"”.
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Studies of Alkyllithium Compounds
Made available in DSpace on 2014-12-05T19:37:52Z (GMT). No. of bitstreams: 1 6200588.pdf: 4102372 bytes, checksum: 2756866d01f16225d5295efcaba72a0c (MD5) Previous issue date: 1961
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Stereochemistry of Vinyl and Alkyllithium Compounds
Made available in DSpace on 2014-12-05T19:37:29Z (GMT). No. of bitstreams: 1 6003943.pdf: 4732671 bytes, checksum: 9632595398d4a129e56f4e007484586d (MD5) Previous issue date: 1960
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Physical Properties of Some Alkyllithium Compounds
Made available in DSpace on 2014-12-05T19:38:05Z (GMT). No. of bitstreams: 1 6303198.pdf: 2016963 bytes, checksum: de5fa863ebbdb44856ca19d9407cfe13 (MD5) Previous issue date: 1962
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Relative Rates of Metalation by Alkyllithium Compounds
Made available in DSpace on 2014-12-10T23:00:54Z (GMT). No. of bitstreams: 1 7105198.pdf: 3206058 bytes, checksum: b7e25e13ca7dcbce7bb6fa76bcf8ddd0 (MD5) Previous issue date: 1970
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Colligative Property and Nmr Studies of Alkyllithium - Base Interactions
Made available in DSpace on 2014-12-09T17:36:15Z (GMT). No. of bitstreams: 1 6910771.pdf: 3496382 bytes, checksum: b794d4bd5e4324ed455df9e137f98c01 (MD5) Previous issue date: 1968
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Endocyclic restriction test: Determination of a geometrical dependance for an aryl bromide-alkyllithium exchange reaction
The geometrical dependance for an aryl bromide-alkyllithium exchange reaction has been investigated by use of the endocyclic restriction test.
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Kinetics and Mechanism of the Reactions of Alkyllithium Reagents With Ketones and Esters in Hydrocarbon Solvents
Embargo set by: Seth Robbins for item 70381 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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An NMR study of 2-ethyl-1-butyllithium and of 2-ethyl-1-butyllithium/lithium 2-ethyl-1-butoxide mixed aggregates
… with 2-ethyl-1-butanol resulted in alkyllithium/lithium alkoxide mixed aggregates, apparently of the form Ra(RO)bLia+b. A multinuclear, variable temperature NMR study of samples with O:Li ratios of 0.2 and 0.4 showed, in addition to the alkyllithium, the formation of four mixed …
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An NMR Study of Trimethylsilylmethyllithium Aggregates and Mixed Trimethylsilylmethyllithium/Lithium trimethylsilylmethoxide Aggregates
… mixed with TMSM-OH in attempts to form mixed alkyllithium/lithium alkoxide aggregates. 13C NMR data for these mixtures gave inconclusive results whether or not these compounds formed, which is different from other primary alkyllithium compounds studied in the past. A study of neopentyllithium, …
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Darstellung und Reaktivität neuer 2,3-Dihydro-1,3-diborol(yl)-rhodium-Komplexe
… NMR-spektroskopische Untersuchungen an Diborol/Alkyllithium/THF-Reaktionsmischungen durchgeführt, um den Reaktionsmechanismus des zweifachen Me/t-Bu-Austauschs bei der Darstellung von (1,3-Di-t-butyl-4,5-dimethyl-2,3-dihydro-1,3-diborolyl)-(toluol)rhodium aus dem Tetramethyldiborol, t-BuLi, …
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Alpha-lithioamine synthetic equivalents from N-Boc secondary amines: Piperideine, pyrrolidine, and perhydroazepine
… introduced on the nitrogen, stable to strong alkyllithium bases, and easily cleaved after elaborations. Determination of the stereochemistry of the lithiation-substitution sequences and the use of this approach to synthesize representative piperidine alkaloids which have cis-2,6-disubstituents …
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Synthesis of P-Stereogenic Bisphosphine Ligands: Application as Hemi-labile Ligands in the Asymmetric Pauson-Khand Reaction
… a phosphine sulfide or a phosphine borane using alkyllithium/()-sparteine complexes, trapping with Ph2PCl or t-Bu2PCl and treatment with BH3•Me2S or sulfur. This gave P-stereogenic bisphosphines. To afford highly enantioenriched ligands, the bisphosphines were recrystallised to increase the …
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Remote Lithiations of Carboxamides: The Manifestation of a Post-Complexation Proximity Effect (Homoenolate)
… at a (beta) secondary carbon atom. The allylic alkyllithium generated undergoes electrophilic at the (beta) or (delta) position. Lithiation and substitution at the (gamma) position occurs upon treatment of N,N-diisopropyl-2-methyl-4-phenylthiobutanecarboxamide (193), with sec-BuLi/TMEDA, …
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Directed ortho Metalation in Hydrocarbon Solvents: Opposing Pi-Resonance Effects
… capability to bidentate complex to the reactive alkyllithium dimer, which enables ortho-metalation to occur in high yields. A second, more limiting exception, would be that the arene substrate possesses localized lone pairs of electrons, as is the case when the directed ortho metalating group …
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Lithiosilane und (Lithiomethyl)silane mit stereogenen Silicium-Zentren: Synthesen und stereochemische Reaktionsverläufe
… Beitrag zum Themengebiet der Silyllithium- und Alkyllithium-Verbindungen – im Speziellen der Benzyllithium-Verbindungen. Im Mittelpunkt der Betrachtungen standen hierbei die Untersuchung der Reaktivität, die Bestimmung von Selektivitäten und die Untersuchung des stereochemischen Verlaufs der …
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Reinventing Aromatic Substitution: A Novel Look
… this reaction is use of extremely strong bases, alkyllithium reagents, which are known to be air and water sensitive. However, the DoM reaction does eliminate the need to separate <em>ortho</em>/<em>para</em> isomer mixtures so that only a single product is generated. The metalation yields …
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Synthesis and evaluation of novel ellipticines as potential anti-cancer agents
… one novel C11 derivative was produced using an alkyllithium reagent. A panel of novel ellipticinium salts encompassing a range of substitutions at the N2, C9 and N6 positions were prepared. Extensive derivatisation of the N10 position of isoellipticine was undertaken for the first time. Novel …
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Chemistry of novel nanoscale carbon materials: Nanodiamond and carbon nano-onions
… nanodiamonds by subsequent reactions with alkyllithium reagents, diamines, and amino acids. The fluoro-nanodiamond and all derivatives were characterized by SEM, TEM, XRD, TG-MS, FTIR, XPS, and Raman measurements. In comparison with the pristine nanodiamond, all functionalized nanodiamonds …
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Synthesis and Characterization of Well-Defined Poly(1,3-Cyclohexadiene) Homopolymers and Copolymers
… a novel pre-formed initiator comprised of an alkyllithium and a tertiary diamine. The use of a pre-formed intiator at moderate temperatures (25° C) enabled the synthesis of high molecular weight poly(1,3-cyclohexadiene) homopolymers (<Mn> = 50000) with narrow molecular weight distributions …
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Doubly Bonded Derivatives of Si and Ge: Cycloaddition Reactions and Polymer Chemistry
… and surface digermenes is made. A variety of alkyllithium (R = Me, Bu, t-Bu) reagents and potassium tert-butoxide were added to the highly reactive silene Mes2Si=CHCH2t-Bu and the germene Mes2Ge=CHCH2t-Bu, in diethyl ether. 1,2-Addition products were obtained regioselectively and in good yield …
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