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Showing 1 to 20 of 28 for “"Lewis bases"”.
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CHIRAL LEWIS BASES ACTIVATION OF TRICHLOROSILYL DERIVATIVES
The design and synthesis of new chiral Lewis bases is a field of extraordinary activity. Among the different classes of Lewis Bases that are able to promote stereoselective reactions, we have studied three class of compounds: phosphoramides, phosphoramidates and phosphine oxides. These compounds, …
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I. Thermodynamic Data for Adducts of Phenol With Lewis Bases. Ii. Coordination Compounds of Nickel(ii) and Chromium(iii) With Lewis Bases
Made available in DSpace on 2014-12-05T19:38:08Z (GMT). No. of bitstreams: 1 6303273.pdf: 4365894 bytes, checksum: 0ad93364ffdf82b9937d21859cf08df6 (MD5) Previous issue date: 1962
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I. Reactions of Nitrogen(ii) Oxide. Ii. Transition Metal Complexes of Lewis Bases
Made available in DSpace on 2014-12-05T19:38:15Z (GMT). No. of bitstreams: 1 6305118.pdf: 5278773 bytes, checksum: 21ce93921bad12797698a410e281a678 (MD5) Previous issue date: 1963
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Reactions of metal complexes with Lewis bases and their utilisation in the selective filtration of smoke
… and of some other complexes of these metals with Lewis bases (e.g. Ph3P and py) have been investigated. From the results obtained and from a critical consideration of analogous reactions reported in the literature the behaviour of metal chelates towards Lewis bases has been assessed. It has been …
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Reactions of Nitrogen(ii) Oxide With Lewis Bases. Part I. Kinetics of the Nitrogen(ii) Oxide - Diethylamine Reaction. Part Ii. Reactions of Nitrogen(ii) Oxide With Various Bases
Made available in DSpace on 2014-12-05T19:37:37Z (GMT). No. of bitstreams: 1 6100189.pdf: 2993289 bytes, checksum: 6915d445a0f049669ceaa370fcd0522c (MD5) Previous issue date: 1960
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Spectroscopic Studies of Rhodium(ii) Perfluorobutyrate and Synthesis of Metallo-Hapten Complexes
… perfluorobutyrate (Rh(,2)(pfb)(,4)) and several Lewis bases was investigated using electron paramagnetic resonance (EPR) and infrared (IR) spectroscopy. The shift of the g-value in the EPR spectra of the spin label complex 2,2,6,6-tetramethylpiperidinyloxy (TEMPO) and the shift of the infrared …
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Catalytic hydroboration: a study of model hydridoiridium and hydridorhodium boron complexes
… acetylenes was inhibited by the presence of free Lewis bases indicating that the reaction proceeds by a dissociative mechanism. Exchange of the chloride ligand in <B>II</B> occurred with other Lewis bases, indicating that chloride dissociation was responsible for opening up the vacant coordination …
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Synthesis and Characterization of Derivatives of Triironnonacarbonyl Ditelluride and Related Compounds
… polar solvents Fe(,3)Te(,2)(CO)(,9) reacts with Lewis bases(PR(,3), P(OR)(,3), NH(,3) CO, RNC, I('-), OH('-)) to form stable adducts at theexpense of an Fe-Fe bond. An X-ray crystal structure of the adductFe(,3)Te(,2)(CO)(,9)PPh(,3) reveals a pentagonal bipyramid with two oppositeequatorial …
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Synthesis and internal redox reactions of oximic and nitroso complexes
… magnetic techniques. Their behaviour towards the Lewis bases pyridine, triphenyl- phosphine and hydroxylamine has been investigated. All of the M(cup)2 complexes, except when M = Zn or Fe, affords adducts on reaction with pyridine, whereas the complex Fe(cup)3 underwent an internal redox reaction. …
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Structure and thermodynamics of Diol inclusion compounds
… compounds containing neutral nitrogen atoms (Lewis bases). The structures of inclusion compounds with two nitriles (acetonitrile and 3- hydroxypropionitrile), with pyridine and with three substituted pyridines (3- methylpyridine, 2,4-dimethylpyridine and 2,6-dimethylpyridine) have been solved …
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Stereoselective synthesis of 1,2-disubstitued βeta-amino alcohols and amino thiols
… brief introduction of the activation of Group 16 Lewis acids by Lewis bases. Chapter 2 details a method for the catalytic, enantioselective, intermolecular, 1,2-sulfenoamination of alkenes. Functionalization is achieved through the intermediacy of an enantioenriched, configurationally stable …
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Sensing Molecular Adsorption Through Interfacial Electron Scattering in Atom -Scale Junctions
… atom-scale junctions were successfully formed. Lewis bases were introduced to atom-scale junctions, and the resulting alternating current impedance change was measured. For example, the interfacial scattering from chemisorption of 10 mM hexadecanethiol (HDT) on a 2.6 G0 atom-scale junction …
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Thermodynamic Studies of Metal Carboxylates
… formation for 1:1 and 2:1 adducts formed by Lewis bases with rhodium(II) butyrate were studied in benzene and methylene chloride solutions. Electrochemical studies of these adducts were carried out in methylene chloride solutions. The thermodynamic data clearly demonstrates substantial …
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Studies in Selective C-C Bond Formation via Borylation and Dehydrogenation
… are presented. First, we attempt to harness the Lewis acidity of boron to induce chemo- and regioselectivity in two fundamental organic reactions (Chapter 1). We explore 1,2-difunctionalization of alkenes via formation of a three-membered cyclic intermediate with the goal of adding various Lewis …
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Part I. Anionic Acyl Transfer Catalysis;Part II. Enantioselective alcoholysis of Acyl Donors;Part III. Enantioselective N-acylation
<p>Neutral Lewis bases, such as 4-(dimethylamino)pyridine and N-methylimidazole, are widely used as acyl transfer catalysts. In contrast, anionic nucleophiles have been little explored in acyl transfer catalysis, although their high nucleophilicity may enable unique applications. In the course of …
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NMR studies of the exchange reactions of CH3CN.BX3 with excess CH3CN /|nJoseph Fogelman. -- 260 St. Catharines, Ont. : [s. n.],
… complexes will be relevant. In general, a strong Lewis base and a strong Lewis acid form a stable adduct provided that certain stereochemical requirements are met. A strong Lewis base has the following characteristics (1),(2) (i) high electron density at the donor site. (ii) a non-bonded electron …
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Lewis Base Promoted Annulations of Allenoates with 1,4-Naphthoquinones
<p>Lewis base promoted cyclization of allenoates with electron deficient olefins open up the possibility to generate more complex organic structures. By generating more complex molecules, we are able to produce new compounds for biomedical and material applications. Both phosphine and amine Lewis …
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The 'Indenyl Effect' in iridium(I) olefin complexes
… than CpIr($\eta\sp2$-C$\sb8$H$\sb{14}$)CO toward Lewis bases. The labile cyclooctene ring of ($\eta\sp5$-C$\sb9$H$\sb7$)Ir($\eta\sp2$-C$\sb8$H$\sb{14}$)CO was readily replaced under mild conditions by other two electron donors such as triphenylphosphine, carbon monoxide, ethylene, or …
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Fluoroalkoxy-functionalized carbenes for main group and transition metal complexes
… and transition metals and as sterically hindered Lewis bases for hydrogen activation. Chapter 1 reviews the background of carbenes as ligands for main group compounds and transition metal complexes. The history and development of chelating Martin-type fluoroalkoxy ligands to form unique bonding …
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Synthesis, study and application of silyl ketene imines in Lewis base catalyzed carbonyl addition
The activation of Lewis acids by chiral Lewis bases has allowed for the development of a robust and highly selective catalyst system for the addition of silylated nucleophiles to carbonyl compounds. In general, aldolate-type products containing secondary and tertiary stereogenic centers are …
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