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Showing 1 to 20 of 65 for “"azides"”.
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The Photochemistry of 3- and 4-Nitro Phenyl Azides
The photochemistry of 4-nitro and 3-nitrophenyl azides in inert and reactive solvents was examined. Photolysis of nitrophenyl azides in solution at room temperature or in a frozen glass at 77 K gives triplet nitrenes. The products of the reaction of triplet nitrenes depend on the power of the light …
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The photolysis and co-irradiated decomposition of barium and strontium azides
The effect of ultraviolet radiation on sieved powders and pellets of barium azide in the temperature range 27,0° - 135,0°C and of strontium azide in the temperature range 30,0° - l35,0°C has been studied. Decompositions in the temperature range 27,0°- 100,0°C for barium azide and 30,0° - 90,0°C for …
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Aryl Azides as Photoaffinity Labels for Estrogen Binding Proteins in the Rat Uterus
Made available in DSpace on 2014-12-10T23:02:06Z (GMT). No. of bitstreams: 1 7511579.pdf: 5060650 bytes, checksum: a860aa18e8d08ca9410b303e913a27d0 (MD5) Previous issue date: 1974
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The photolysis of calcium, barium, strontium and lithium azides and the co-irradiated decomposition of calcium azide
… powdered calcium, barium, strontium and lithium azides in the temperature range -80,0° - 35,0°C has been studied. Powdered and pelleted calcium azide was also irradiated with ultraviolet radiation in the temperature range 35,0° - 90,0°C and powdered lithium azide in the temperature range 24,0° - …
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Synthetic and mechanistic investigation of new radical processes: reaction of organic azides with group-XIII Lewis acids
… of organic (alkyl, aryl, acyl, solfonyl) azides. The new approach entails mild reaction conditions and provides high yields of the corresponding amines and amides, also showing high degrees of selectivity. The system dichloroindium hydride / azides can be utilised in fivemembered ring …
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The Chemistry of Aroyl Azides in Piperidine- and Steroid-Separated Bichromophoric System: Photoinduced Long-Distance Intramolecular Electron Transfer Reactions
The photochemistry and photophysics of piperidine- and steroid- separated bichromophoric systems containing an aroyl azide as the electron acceptor and secondary aromatic amines as the electron donors was examined. We report the first example of unique photochemical reactivity associated with …
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Synthetic methodologies toward the functionalization of benzhydrols and carbohydrates
Organoazides are highly versatile substrates that are often used as precursors to triazoles, amides, amines and imines. As dipolar functional groups, azides are routinely exploited in chemical biology as a means to append biomarkers onto macromolecules via cycloaddition reactions. Furthermore, the …
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Part One: Photochemistry of Aryl Azides. Chemical Properties of the Transient Intermediates. Part Two: Thermolysis of an Endoperoxide. Generation of an O-Xylylene Peroxide (Nitrene)
… The products of direct photolysis of the aryl azides can depend dramatically on the concentration of the azide and on the power of the light source. Direct irradiation gives the triplet aryl nitrenes, with relatively long-lived singlet-state precursors. The structures of these intermediates and …
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Design, synthesis, and biochemical evaluation of novel photoaffinity labeling reagents for the estrogen and progesterone receptors
… attachment to ER from rat uterus. Both azides 1 and 2 demonstrate high binding affinity for ER as determined by both a competitive binding assay (relative binding affinities: estradiol = 100; TFAA = 9.3; PAA = 66) and a direct binding assay (K$\sb{\rm d}$: estradiol = 0.24 nM; TFAA = …
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Characterizing triplet azo biradical and corannulene- halogen complexes by laser flash photolysis
… systems: 1) the photolysis of aryl azides in solution and in solid-state 2) the photo-reaction of corannulene in halogenated solvents.</p><p>Singlet aryl nitrene was formed upon irradiation of aryl azides, and the singlet nitrene could decay by intersystem-crossing to form triplet …
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Reaction of allene with phenyl azide
… gain greater insight into the reaction of aryl azides with allenes.
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Lewis acid catalysis in organic synthesis
… been developed for 1,3-dipolar cycloaddition of azides to terminal alkynes using CuCl-RTIL. This catalytical system gives only 1,4-disubstituted 1,2,3-triazoles. Reactions of Alkyl and aryl azides with a variety of terminal alkynes were successfully catalyzed using CuCl-RTIL catalytic system. …
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Regioselective Synthesis of Glycosaminoglycan Analogs
… followed by azide displacement to introduce azides as the GAG amine precursors. The resulting 6-N3 cellulose acetate was then saponified to liberate 6-OH groups, followed by subsequent (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidation of the liberated primary hydroxyl groups to …
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Stereoselective alkylations and rearrangements of chiral phosphonic and phosphinic acid derivatives
… ($\geq$99.9% e.e.) phosphonic and phosphinic azides were prepared and photolyzed in methanol to effect the phosphorus analogues of the carbonyl-Curtius rearrangement. These studies showed that carbon migration in the phosphinoyl-Curtius rearrangement proceeds with 99% net retention of …
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Dielectric Breakdown of Silver Azide
The breakdown of single crystals of heavy metal azides has been investigated. In silver azide, the low-field conduction is by mobile interstitial cations and their enthalpies ,of formation and hopping have been determined from the Arrhenius plot of the conductivity. Based on AC conductivity · …
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Controlled metabolic cell labeling and bioorthogonal click chemistry for cancer targeting
… label cell surface with chemical groups (e.g., azides) only in the presence of either exogenous triggers (ultraviolet (UV)) or endogenous triggers (H2O2, tumor hypoxia, NAD(P)H dehydrogenase quinone 1 (NQO1), and histone deacetylase (HDAC)/cathepsin L (CTSL)). Among them, HDAC/CTSL-responsive …
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Synthesis of N-Heterocycles and Thiocines via Electrophilic Divalent Reactive Intermediates
… My research has focused on using aryl amines and azides as the N-atom source to synthesize these complex organic scaffolds that possess biological activity such as dibenzazepines, benzimidazoles, and 3H-indoles by accessing electrophilic divalent intermediates. I found that exposure of …
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STUDY OF CLICK CHEMISTRY: WORKING TOWARDS ‘CLICKING’ A NON-STEROIDAL ANTI-INFLAMMATORY TO AN APOPTOSIS INHIBITOR Q-VD-OPH
… 1,2,3-triazole forming reaction between azides and terminal alkynes has contributed to drug discovery due to the high degree of dependability, efficiency, specificity and biocompatibility of the reactions and products. Using this well-known click chemistry reaction, a non-steroidal …
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Part I. Aromatic Fluorinations for Fluorine-18 Labeling of Estrogens. Part Ii. Bromodesilylation-Potential Method for Regiospecific Radiobromination of Aromatic Systems. Part Iii. Synthesis of Isohexestrol and Isohexestrol Derivatives
… fluorination methods, the decomposition of aryl azides and the decomposition of aryl triazenes, were investigated as methods potentially suitable for fluorine-18 labeling of estrogens. The aryl triazene method gives moderate yields in many systems, but fails with ortho methoxy or …
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