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Showing 1 to 20 of 258 for “"amides"”.
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Biosynthesis of Long-chain Fatty Acid Amides
The vast variety of long-chain fatty acid amides identified in biological systems is intriguing. The general structure of a fatty acid amide is R-CO-NH-X, where R is an alkyl group and X is derived from an immense variety of biogenic amines. Although structurally simple, the bioactivities of these …
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Reductive Coupling and Polymerization of Unsaturated Amides
Made available in DSpace on 2015-05-12T17:02:30Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0006973.PDF: 4366142 bytes, checksum: fd7cc08076490683166d6124a813a4a8 (MD5) Previous issue date: 1953
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Beta'-Lithiation of Alpha, Beta-Unsaturated Amides
… secondary and tertiary amides is reported. N-Methyl-1-cyclohexenecarboxamide and N-methyl-1-cyclopentenecarboxamide are metalated at nitrogen and at the (beta)'-carbon with either sec-butyllithium/TMEDA at -78(DEGREES)C or n-butyllithium at 0(DEGREES)C. Further reaction …
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Reactivity studies of phosphoric amides and esters
The effect of protonation and Lewis acid-base interaction on the ¹H n.m.r. chemical shifts of the ester and amide bonds in selected phosphoramidates (RO)₂P(O)NR'₂ was investigated. The results are interpreted in terms of the interaction of the phosphoryl oxygen atom with Lewis acids and …
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Chemical and Mechanistic Studies of Alpha' Lithio Amides
… and electrophilic substitution of the allyl amides, N-allyl-N-methyl-2-ethyl-methylbutanamide (76), 1,2,5,6-tetrahydropyridinyl-2-ethyl-2-methylbutanamide (77), 3-methylene-2-ethyl-2-methylbutanamide (78) and 5-tert-butyl-1,2,5,6-tetrahydropyridinyl-2-ethyl-2-methylbutanamide (79) is …
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Formation and electrolysis of disubstituted alkali-metal amides
The purpose of this investigation was to determine the products of the electrolysis of dimethyl lithium amide.
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Adsorption of alkyl amides: monolayer structures and mixing behaviour
In this work monolayers of alkyl amides adsorbed on a graphite surface have been successfully identified and investigated using a combination of synchrotron X-ray and neutron diffraction and Differential Scanning Calorimetry (DSC). Exceptionally stable solid layers have been observed at …
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Preparation and reactions of some orthomanganated ketones, amides and aldehydes
… (13), the first examples of orthomanganated amides, have been synthesized by reaction of N-acetylindole and N,N-dimethylbenzamide respectively with PhCH₂Mn(CO)₅. 7 (R=CH₃) was identified by X-ray crystallography. Preparation of the N-benzoyl- (7, R=Ph) analogue highlights a preference for …
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Probing the mechanism of the asymmetric alkylation of pseudoephedrine amides
… his co-workers using immobilized pseudoephedrine amides on a Merrifield resin as chiral auxiliaries, when analysed, throw into question Myers' mechanistic model. Procter and his co-workers observed that the polymer-supported systems gave similar diastereomeric excess as the solution-state …
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The synthesis, spectroscopy and fungicidal activity of phosphoric acid amides
The reaction between N,N,N‘,N'-tetramethylphosphoric triamide (TMPT) and chloral has been shown to give chloroform, dimethylformamide, (Me2N)2P(0)NHCH(CCl,)NMe2 and polymeric phosphorus containing compounds. A possible mechanism for the formation of these products is given.
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Activation of white phosphorus by molybdenum- and uranium tris-amides
Molybdaziridine-hydride Mo(H)([eta]²-Me₂C=NAr)(N[i-Pr]Ar)₂ (1, Ar = 3,5-C₆H₃Me₂) acts as a source of its three-coordinate isomer Mo(N[i-Pr]Ar)₃ (2). This relationship has been probed via an investigation of the coordination chemistry of 1 and Mo(N[t-Bu]Ar)3 (3), a bulky analog of 2, with …
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Oxidative additions of amides to an iridium(I) metal center
Carboxylic amides will add oxidatively via N-H activation to the complex [(COD)Ir(PMe3h]CI (where COD 1,5-cyclooctadiene) in organic solvents at 80°C to form stable iridium hydrides with the hydride arranged cis to nitrogen and trans to chloride. Acetamide will add to form the complex …
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Synthesis and characterisation of amides based on crown ether supramolecular gels
… supramolecular gels based on crown ether amides because amide moieties have been extensively used as supramolecular synthons to generate LMWGs with tuneable properties and crown ethers represent a group of compounds with an exceptional ability to selectively coordinate to ions of alkali …
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New amides, amidinides and mixed-metal derivatives thereof in magnesium chemistry
… two structurally related mixed lithium-magnesium amides, [{(Me₃Si)₂N}₁₃LiMg] and [{(c-C₆H₁₁)₂N}₃LiMg.THF], based on discrete (NLiNMg) cyclic cores, have been prepared. Further exploration of the hexamethyldisilazide has opened up a remarkable new area of macrocyclic chemistry. Thus, …
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Chemistry with chiral lithium amides: enantiotopic group and face-selective reactions
… (up to 75% ee) induced by those chiral lithium amides. On the other hand, high diastereoselectivity (up to 100% de) and the low enantioselectivity were obtained from the aldol reaction of tropinone enolate with benzaldehyde differentiated by chiral lithium amides with extra electron donor atoms. …
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Thermochemistry and bond energies of acetohydrazide, amides and cyclic alkyl ethers
Structure, thermochemical properties, bond energies and internal rotation potentials of Acetic Acid Hydrazide (CH_3CONHNH_2), Acetamide (CH_3CONH_2) and N-methyl Acetamide (CH3CONHCH3) and their radicals corresponding to loss of hydrogen atom have been studied. Gas phase standard enthalpies of …
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Thermodynamics of Molecular Addition Compound Formation Between Amides and Lewis Acids
Made available in DSpace on 2014-12-05T19:37:48Z (GMT). No. of bitstreams: 1 6104402.pdf: 2471219 bytes, checksum: 7150fa5f304da913bf0ee9390f8bc520 (MD5) Previous issue date: 1961
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