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Showing 1 to 19 of 19 for “"Hydrazines"”.
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The N-H stretching frequency of substituted hydrazines
… and bending frequencies of substituted hydrazines. In this project an investigation was undertaken to correlate the N-H stretching and bending frequencies of 1, 1-disubstituted hydrazines. The difference between Vs and Vas was also investigated. The presence of hydrogen bonding made it …
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The detection of hydrazine and related materials by ion mobility spectrometry.
… years, has been shown to be capable of detecting hydrazines at low concentrations but with interference from ammonia. Ammonia is usually present in hydrazine environments, as a breakdown product or a by-product of the human metabolism. This project was undertaken to investigate mechanical and …
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Utilisation des diazirines comme source d'azote électrophile pour la synthèse d'hydrazines et d'hétérocycles
Les hydrazines sont des molécules très importantes en chimie organique, ainsi qu’en industrie pharmaceutique, celles-ci pouvant être utilisées pour la synthèse d’une multitude d’hétérocycles. Il existe de nombreuses stratégies de synthèse de ces composés. Cependant, ces méthodes peuvent être …
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A study of selected water-soluble hydrazyl free radicals
… their progenitor molecules, the corresponding hydrazines. The analogs were produced by replacement of either an ortho or para nitro group (NO₂•) with a sulfo group (SO₃¯), in the trinitrophenyl ring. The compounds have been characterized by ultraviolet-visible light spectroscopy, elemental …
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Totalsynthese von (+)-2-epi-Deoxoprosopinin und neue Hydrazin-Harze für die organische Festphasensynthese
… the C-N double bond to afford the corresponding hydrazines. Release from solid support was achieved by reductive N-N bond cleavage to furnish a -branched primary amines, which were isolated as their corresponding amides in good overall yields and in high purity (12 examples). This methodology …
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ΚΙΝΗΤΙΚΗ ΜΕΛΕΤΗ ΚΑΙ ΑΝΑΛΥΤΙΚΕΣ ΕΦΑΡΜΟΓΕΣ ΑΝΤΙΔΡΑΣΕΩΝ 2,4-ΔΙΝΙΤΡΟΦΘΟΡΟΒΕΝΖΟΛΙΟΥ ΜΕ ΧΡΗΣΗ ΕΚΛΕΚΤΙΚΟΥ ΗΛΕΚΤΡΟΔΙΟΥ ΦΘΟΡΙΟΥΧΩΝ
… OF THE REACTION OF DNFB WITH AMINES, HYDRAZIDES, HYDRAZINES AND AZIDE AND SOME DERIVATIVESOF PHARMACEUTICAL INTEREST. KINETIC-POTENTIOMETRIC METHODS ARE PROPOSED. STUDYOF MICELLAR CATALYSIS OF SLOW REACTIONS OF DNFB WITH VARIOUS AMINOCOMPOUNDS BYSURFACTANTS. KINETIC-POTENTIOMETRIC METHODS FOR THE …
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Studies in the synthesis of pyrimidines, pyrazoles, and pyrazolo pyrimidines. New syntheses of 1, 3 and 5 substituted pyrazolo [3, 4-d] pyrimidines, including glycosides related to naturally occurring pyrimidines, imidazoles, purines and their nucleoside derivatives.
… which, by reaction with primary amines and hydrazines, would give acyclic intermediates capable of easy cyclisation into the uracil, pyrazole and pyrazolo [3,4-d] pyrimidine ring systems. Variation in the nature of specific substituents being determined by the choice of amine or hydrazine, …
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Organophosphorus-Catalyzed Reductive Functionalization of Nitrocompounds via P(III)/P(V) Redox Couple
… forming reactivity in the formation of various hydrazines with excellent chemoselectivities and functional group tolerance. These works herein not only expand the reactivity of low-cost and environment-benign organophosphorus compounds as platforms for catalytic reductive O-atom transfer, but …
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Novel small molecules for modulation of bacterial signaling pathways
… The reactions of brominated furanones with hydrazines have been developed granting access to 5-membered aminopyrrolones and hydrazinyl furanones, as well as 6-membered pyridazinones with novel bromination patterns. The ratio of formation of these different heterocycles varied with the types …
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BIOISOSTERES OF AMPA: CONFORMATIONAL ANALYSIS AND STRUCTURE ACTIVITY RELATIONSHIP
… of hydrazone bioisosteres, most electron rich hydrazines undergo ring closer to form fused bicyclic systems, the isoxazolo[3,4-d]pyridazinones. Several hydrazone acids synthesized, bind to the SXc- with affinities comparable to those of the endogenous substrates. In contrast, the isoxazolo …
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Asymmetrische Synthese von Beta-Aminosulfonaten, Beta-Sultamen und Gamma-Sultonen
… aza-Michael addition of the enantiopure hydrazines (S)-1-amino-2-methoxymethyl-pyrrolidine (SAMP) or (R,R,R)-2-amino-3-methoxymethyl-2-azabicyclo[3.3.0]-octane (RAMBO) to alkenyl-cyclohexyl sulfonates. This leads to beta-hydrazino sulfonates in moderate to good yields (41-85%) and …
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BIOISOSTERES OF AMPA: CONFORMATIONAL ANALYSIS AND STRUCTURE ACTIVITY RELATIONSHIP
… of hydrazone bioisosteres, most electron rich hydrazines undergo ring closer to form fused bicyclic systems, the isoxazolo[3,4-d]pyridazinones. Several hydrazone acids synthesized, bind to the SXc- with affinities comparable to those of the endogenous substrates. In contrast, the isoxazolo …
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Synthesis and properties of some 4H-1, 3, 4 benzothiadiazines /|nby Darko J. Vukov. -- 260 St. Catharines, Ont. : [s. n.],
… section, a new method of converting N-aroyl- hydrazines to hydrazidic halides is described. The second section deals with the products of reaction of hydrazidic halides with thioacetate ion in acetonitrile at room temperature. A number of new acetylthiohydrazides has been isolated together …
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Asymmetrische Pinakolkupplungen
… complexes of TiCl3 and enantiopure amines or hydrazines in tetrahydrofuran were investigated as chiral coupling reagents. The pinacol coupling of benzaldehyde leads to the hydrobenzoin in yields of 0 - 100%, diastereomeric excesses of dl:meso = 46:54 - 96:4 and enantiomeric excesses of 6 - …
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Asymmetrische Synthese von Stigmolon und Untersuchungen zur asymmetrischen Synthese von (-)-Cytoxazon und Galbonolid A und B
… of p-anisyl lithium to SAMP-hydrazones, the hydrazines were achieved as diastereo- and enantiomerically pure compounds with good yields. Syntheses of 3-SMP substituted cis-oxazolidin-2-ones were successfully achieved with very good yields using a TBAF-mediated cyclisation. The cleavage of the …
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Application of silicon photonic microring resonators to the study of surface bioconjugation and protein capture agent binding kinetics
… hydrazone ligation between surface immobilized hydrazines and aldehyde-modified antibodies is shown to be an efficient method to functionalize model oxide-coated sensor substrates with protein capture agents, allowing derivatization of substrates with reduced incubation time and sample …
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Applications of a hand-held optoelectronic nose: security screening, medical diagnosis and food inspection
… dyes (tolidine, odianisidine, etc.), and hydrazines for ketone detection. Hierarchical cluster analysis, principal component analysis, and support vector machine analysis show excellent discrimination among explosive analytes from a variety of sources. Detection limits are calculated to be …