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Showing 1 to 16 of 16 for “"Isocyanides"”.
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Interactions of Isocyanides and Cytochrome P-450(cam)
Made available in DSpace on 2014-12-09T17:36:51Z (GMT). No. of bitstreams: 1 7021078.pdf: 2721091 bytes, checksum: 82c8486d12382d3744b39b43dee1c1ac (MD5) Previous issue date: 1970
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Lewis Base Catalysis: I. Catalytic Enantioselective Aldol Additions of Methyl Trichlorosilyl Ketene Acetal to Ketones. II. Catalytic Enantioselective Alpha-Additions of Isocyanides to Aldehydes
… enantioselective alpha-addition reaction of isocyanides has been demonstrated with a SiCl4·bisbinaphthyldiamine phosphoramide catalyst. Good yields have been obtained with aromatic, heteroaromatic, conjugated non-aromatic and non-branched aliphatic aldehydes. Aromatic, aliphatic and …
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Tetrathiometallates in Synthesis and Catalysis
… Et4N[ReS4] has also been shown to react with isocyanides (MeNC, t-BuNC, CyNC) which add across the S=M=S functionality via a 3+1 cycloaddition process in the presence of S 8 to form Et4N[Re(S)(S4)(S2CNR)]. This type of cycloaddition has not been observed before for metal sulfides.
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Amidate complexes of the group 4 metals : sythesis, reactivity, and hydroamination catalysis
… abstraction, and protonolysis. Insertion of isocyanides into the Zr-C bonds of [DMP(NO) tBu]₂Zr(CH₂Ph₂ results in the formation of ƞ₂-iminoacyl complexes, which can either undergo thermally induced C=C coupling to generate an enediamido complex (aryl isocyanides), or rearrange to generate a …
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Activation of white phosphorus by molybdenum- and uranium tris-amides
… Mo(N[t-Bu]Ar)3 (3), a bulky analog of 2, with isocyanides RNC (R = 1-adamantyl, tert-butyl) and white phosphorus (P₄). A comparison of the rates and activation parameters of these reactions indicates that 2 is not an intermediate on the pathway from 1 to products, but rather than the …
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Synthesis of heterocycles via isocyanide-based multi-component reactions
… involving the process of insertion of isocyanides into a carbon-palladium bond. The application to the synthesis of oxazolines was explored and was shown to give good yields of 2-aryloxazolines. The reaction conditions developed use a PdCl₂/dppf catalytic system which enables the …
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Efficient & Novel Approaches to Relay Chirality in the Synthesis of Planar Chiral Metallocenes
… complexes were treated with a selection of isocyanides and found to give novel planar chiral (η5–cyclopentadienyl)(η4–iminocyclopentadiene)cobalt metallocenes in good yields >60% yield and in some cases a diastereomeric ratio of up to 5:1. The isocyanide insertion reaction was in some cases …
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Coordination chemistry of unusual oxidation states of nickel and palladium relevant to homogeneous catalysis
… chemistry of Ni-isocyanide complexes. Isocyanides are most commonly form coordinatively saturated, inert transition metal coordination compounds. It was found that simple, commercially available isocyanide ligands were capable of stabilizing dinuclear NiI complexes – a much sought after …
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New Chemistry of Mercaptoazulenes and Low-Valent Complexes of Isocyanoarenes
… variations in non-benzenoid aromatic isocyanides would result in the formation of either cis- or trans- [M(dppe)2(CNAr)2] and related complexes.
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Reactions of cyclomanganated compounds
… acetyl-aryl compounds with organic isocyanides (C≡NR) afforded a number of novel compounds. For example η2-(2-acetylphenyl)-tetracarbonylmanganese (79) afforded four different types of products depending on the isocyanide; tert-butyl isocyanide produced 82, ethyl isocyanide produced …
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The synthesis and reactivity of binuclear μ-hydrocarbyl complexes of some transition metals
… nucleophiles such as tertiary phosphines and isocyanides, yield diacyl compounds of the type [CpFe(CO)L]₂{μ-CO(CH₂)nCO} (Cp = C₅H₄Me or C₅Me₅) and (L = tertiary phosphine or isocyanide). Similar ligand induced CO insertion reactions were observed for the manganese and rhenium alkanediyl …
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Utilising Boron containing Lewis Acid Functions as "Stores" for Hydride and Other functional groups and its impact on Catalytic Reactions
… be promoted. The addition of carbon monoxide and isocyanides to a NBD complex results in the sequential migration of a hydride to the metal centre followed by the migration of a NBE moiety from the metal to the boron. This novel transformation results in the formation of a intramolecular …
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Diverse Applications of Flow Technology in Discovery Chemistry
… Using these features an in situ synthesis of isocyanides, reagents notorious for their unpleasant smell, was developed. Coupling this method to the Ugi four-component reaction, a series of medicinally relevant amides was synthesized. Reactions performed in the flow system experienced an …
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Ligand design in nickel and cobalt complexes for homogeneous catalysis
… of the ligand backbone via insertion of isocyanides, forming the corresponding NHC-η2-iminoacyl nickel complexes. Oxidation of the η2-iminoacyl-containing complex resulted in this moiety releasing from the nickel center to form a nitrilium species which upon reduction reformed the …
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Cycloaddition Reactions of (Di)tetrelenes
This thesis examines a variety of cycloaddition reactions of multiply-bonded heavy analogues of carbon. With the aid of a mechanistic probe, the mechanism of the addition of alkynes to a germene and a digermyne was examined. In both cases, the addition does not involve the itermediacy of an vinyl …
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I. The Reaction of Carboxylic/Thiocarboxylic Acids with Isonitriles II. Ruthenium Hydride Ring Opening of an Azetidinium Cation
The mechanism of the reaction of benzoic acid with cyclohexyl isonitrile leading to N-cyclohexyl-N-formylbenzamide has been studied quantitatively. The reaction is first order in each reagent and has the activation parameters delta H = 16.9(5) kcal mol-1 and delta S = 26(1) cal mol-1K-1 in toluene. …