Search Within


Applied Filters:
Showing 1-30 of 35 results for "386464" within Papers
Kanwal Jit Singh et al.
Journal of the American Chemical Society, 128(42), 13753-13760 (2006-10-19)
Structural and mechanistic studies of the lithium diisopropylamide (LDA)-mediated anionic Fries rearrangements of aryl carbamates are described. Substituents at the meta position of the arene (H, OMe, F) and the dialkylamino moiety of the carbamate (Me(2)N, Et(2)N, and i-Pr(2)N) markedly
Alexander C Hoepker et al.
Journal of the American Chemical Society, 133(18), 7135-7151 (2011-04-20)
Ortholithiation of 1-chloro-3-(trifluoromethyl)benzene with lithium diisopropylamide (LDA) in tetrahydrofuran at -78 °C displays characteristics of reactions in which aggregation events are rate limiting. Metalation with lithium-chloride-free LDA involves a rate-limiting deaggregation via dimer-based transition structures. The post-rate-limiting proton transfers are
Mihai S Viciu et al.
Journal of the American Chemical Society, 132(18), 6361-6365 (2010-04-20)
Treatment of 2,6-difluoropyridine with lithium diisopropylamide in THF solution at -78 degrees C effects ortholithiation quantitatively. Warming the solution to 0 degrees C converts the aryllithium to 2-fluoro-6-(diisopropylamino)pyridine. Rate studies reveal evidence of a reversal of the ortholithiation and a
Da-Wei Fu et al.
Advanced materials (Deerfield Beach, Fla.), 23(47), 5658-5662 (2011-11-22)
A simple organic salt, diisopropylammonium chloride, shows the highest ferroelectric phase transition temperature among molecule-based ferroelectrics with a large spontaneous polarization, making it a candidate for practical technological applications.
A simple and novel amide ligand based on quinoline derivative used for palladium-catalyzed Suzuki coupling reaction.
Liu H, et al.
Journal of Organometallic Chemistry, 794, 27-32 (2015)
Diisopropylamide and TMP turbo-Grignard reagents: a structural rationale for their contrasting reactivities.
David R Armstrong et al.
Angewandte Chemie (International ed. in English), 49(18), 3185-3188 (2010-03-31)
Enthalpies of combustion of di-n-propylamine, diisopropylamine, diisobutylamine, and di-sec-butylamine.
Ribeiro da Silva MAV, et al.
The Journal of Chemical Thermodynamics, 29(9), 1025-1030 (1997)
Songping Liao et al.
Journal of the American Chemical Society, 125(49), 15114-15127 (2003-12-05)
Lithium diisopropylamide-mediated lithiations of N-alkyl ketimines derived from cyclohexanones reveal that simple substitutions on the N-alkyl side chain and the 2-position of the cyclohexyl moiety afford a 60,000-fold range of rates. Detailed rate studies implicate monosolvated monomers at the rate-limiting
Antonio Ramirez et al.
Journal of the American Chemical Society, 128(31), 10326-10336 (2006-08-03)
Structural, kinetic, and computational studies reveal the mechanistic complexities of a lithium diisopropylamide (LDA)-mediated ester enolization. Hemilabile amino ether MeOCH2CH2NMe2, binding as an eta1 (ether-bound) ligand in the reactant and as an eta2 (chelating) ligand in the transition structure, accelerates
Microwave-Assisted Copper-Catalyzed Four Component Tandem Synthesis of 3-N-Sulfonylamidine Coumarins.
Murugavel G and Punniyamurthy T.
The Journal of Organic Chemistry, 80 (12), 6291-6299 (2015)
Yun Ma et al.
Journal of the American Chemical Society, 132(44), 15610-15623 (2010-10-22)
Lithium diisopropylamide (LDA) in tetrahydrofuran at -78 °C undergoes 1,4-addition to an unsaturated ester via a rate-limiting deaggregation of LDA dimer followed by a post-rate-limiting reaction with the substrate. Muted autocatalysis is traced to a lithium enolate-mediated deaggregation of the
José S Casas et al.
Inorganic chemistry, 49(5), 2173-2181 (2010-01-22)
The reactions of PbR(2)(OAc)(2) (R = Me, Ph) with 3-(2-thienyl)-2-sulfanylpropenoic acid (H(2)tspa) in methanol or ethanol afforded complexes [PbR(2)(tspa)] that electrospray ionization-mass spectrometry (ESI-MS) and IR data suggest are polymeric. X-ray studies showed that [PbPh(2)(tspa)(dmso)] x dmso, crystallized from a
David B Collum et al.
Angewandte Chemie (International ed. in English), 46(17), 3002-3017 (2007-03-28)
Lithium diisopropylamide (LDA) is a prominent reagent used in organic synthesis. In this Review, rate studies of LDA-mediated reactions are placed in the broader context of organic synthesis in three distinct segments. The first section provides a tutorial on solution
Kanwal J Singh et al.
Journal of the American Chemical Society, 130(52), 18008-18017 (2008-12-05)
Ortholithiation of 3-fluorophenyl-N,N-diisopropyl carbamate by lithium diisopropylamide (LDA) in THF at -78 degrees C affords unusual rate behavior including linear decays of the carbamate, delayed formation of LDA-aryllithium mixed dimers, and evidence of autocatalysis. A mechanistic model in conjunction with
Weizhi Sun et al.
Chemical biology & drug design, 77(3), 206-211 (2011-01-20)
A new class of potential prodrugs, 1,3-cyclic propanyl phosphate esters of 18β-glycyrrhetic acid, was designed and synthesized through the key reaction of 18β-glycyrrhetic acid with 1,3-cyclic propanyl phosphate ester catalysed by lithium diisopropylamide. The sustained-release properties of 1,3-cyclic propanyl phosphate
Joel Putnam et al.
Journal of chromatography. A, 1216(48), 8488-8495 (2009-10-27)
Acid/base modifiers are sometimes used as additives in normal phase elution on columns packed with CHIRALPAK AD. They affect enantioseparations in ways that are not understood for the lack of systematic studies, which makes the scale-up of preparative separations difficult
Elena Barreiro et al.
Dalton transactions (Cambridge, England : 2003), 42(16), 5916-5923 (2013-03-06)
The hexanuclear complex [HQ][Ag(p-mpspa)] (H2-p-mpspa = 3-(4-methoxyphenyl)-2-sulfanylpropenoic acid) was prepared by reacting the precursor [Ag(H-p-mpspa)] with diisopropylamine (Q). The complex was characterized by spectroscopic techniques and the structure was solved by a single crystal X-ray diffraction study. The crystal contains
Koichi Mikami et al.
Chemical record (New York, N.Y.), 6(1), 1-11 (2006-02-14)
The difficulty as well as the significance of the direct generation of metal enolates of alpha-CF(3) ketones cannot be easily understood by chemists unfamiliar with F. In sharp contrast to the sunny side of non-F, hydrocarbon chemistry, F chemistry has
Decoupling deprotonation from metalation: Thia-Fries rearrangement.
Alan M Dyke et al.
Angewandte Chemie (International ed. in English), 47(27), 5067-5070 (2008-05-28)
Design, synthesis and biological evaluation of novel non-azole derivatives as potential antifungal agents.
Tang H, et al.
Chinese Chemical Letters = Zhongguo Hua Xue Kuai Bao, 26(9), 1161-1164 (2015)
Martin J P Harger
Chemical communications (Cambridge, England), (22)(22), 2863-2865 (2005-06-02)
The reaction of PSCl3 with Pr(i)2NH at 60 degrees C affords the disubstitution product (Pr(i)2N)2P(S)Cl without first forming the monosubstitution product Pr(i)2NP(S)Cl2; a P(III) compound (possibly PCl3) generated in situ seems to be a crucial intermediate.
Arjun Mendiratta et al.
Chemical communications (Cambridge, England), (27)(27), 3403-3405 (2005-07-06)
Deprotonation of the titanium formate complex [Ar(t-Bu)N]3TiOC(O)H with LiN(i-Pr)2 resulted in the release of free CO and the formation of a titanium(IV) oxoanion complex, isolated as its lithium salt.
Bouclé Sébastien et al.
Molecules (Basel, Switzerland), 15(11), 7742-7749 (2010-11-03)
Treatment of 1,4,4-trimethyl-3,4-dihydroquinolin-2(1H)-one (2) with lithium diisopropylamide (LDA) followed by a wide range of electrophiles give the corresponding 4,4-dimethyl-3-substituted-3,4-dihydroquinolin-2-ones (3-13), providing a very mild electrophilic substitution of the 4,4-dimethyl-1,2,3,4-tetrahydroquinoline core.
Evanly Vo
Journal of occupational and environmental hygiene, 1(12), 799-805 (2005-03-04)
The aim of this study was to assess the use of colorimetric indicator pads and the thermo-hand method for detection of inorganic/organic base permeation of chemical protective gloves under simulated in-use conditions. Breakthrough times for four types of gloves were
Yun Ma et al.
Journal of the American Chemical Society, 128(48), 15399-15404 (2006-11-30)
Lithium diisopropylamide-mediated dehydrobrominations of exo-2-bromonorbornane, 1-bromocyclooctene, and cis-4-bromo-tert-butylcyclohexane were studied in THF solutions and THF solutions with added hexamethylphosphoramide (HMPA). Rate studies reveal a diverse array of mechanisms based on mono-, di-, and trisolvated monomers as well as triple ions.
Alexandre Loukanov et al.
Microscopy research and technique, 78(11), 994-1000 (2015-08-26)
The immobilization and stretching of randomly coiled DNA molecules on hydrophobic carbon film is a challenging microscopic technique, which possess various applications, especially for genome sequencing. In this report the pyrenyl nucleus is used as an anchor moiety to acquire
Research on Synthesis and Corrosion Inhibitory Performance of Diisopropylamine Methyl Urea.
Zhou FR and Zhang H.
Applied Mechanics and Materials, 713, 2839-2842 (2015)
Iron-Catalyzed Direct Synthesis of Amides from Methylarenes.
Kotha SS, et al.
Advanced Synthesis & Catalysis, 357(7), 1437-1445 (2015)
Mostafa Shahin et al.
Journal of drug targeting, 22(7), 629-637 (2014-06-01)
Methoxy poly(ethylene oxide)-block-poly-(α-carboxylate-ε-caprolactone) (PEO-b-PCCL) was used to develop pH-responsive polymeric micelles for the delivery of cisplatin (CDDP). Micelles were prepared through complexation of CDDP with the pendant carboxyl groups on the poly(ε-caprolactone) core, perhaps through coordinate bonding. The obtained micelles
Gerrit V R Goodman et al.
Journal of occupational and environmental hygiene, 1(12), 806-815 (2005-03-04)
A laboratory study assessed the impacts of water spray pressure, face ventilation quantity, and line brattice setback distance on respirable dust and SF6 tracer gas concentrations around a continuous mining machine using a sprayfan or directional spray system. Dust levels
Page 1 of 2