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Showing 1 to 20 of 65 for “"bromination"”.
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Some Bromination Products of Bastrop Cedar Leaf Oil
No abstract prepared.
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The Nature of The Chain-Carrying Species in The Nbs Bromination of Toluene
Made available in DSpace on 2014-12-05T19:38:17Z (GMT). No. of bitstreams: 1 6305133.pdf: 2845168 bytes, checksum: 5143c55b04749d7e53fbb18718f2a972 (MD5) Previous issue date: 1963
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The study of [beta]-cyclodextrin interactions with sugars using "inhibition kinetics" and the bromination of pyrimidine derivatives
… values in literature. Part II . The aqueous bromination of 2-aminopyrimidine (2-AP) involves two major steps, and the first step forms an addition product, an intermediate that was previously observed by NMR. The second step, which is quite slow, involves elimination of water from the …
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Synthesis and characterization of molecules for electron transfer research.
… was 1,4-naphthoquinone. After methylation and bromination, the Grignard reagent of the resulting bromide was reacted with cyclohexanedione, mono ethylene ketal. The resulting alcohol was changed to the donor precursor through the following functional group transformation steps: dehydration, …
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Studies of some reactions between electrophilic halogens and various conjugated systems in which intermediates or products having rearranged double-bond systems are concerned
PART I A STUDY OF MECHANISTIC VARIATIONS IN THE BROMINATION AND CHLORINATION OF SOME ALKYL PHENOLS, PHENYL ETHERS AND PNENYL ESTERS. The brominations of some 2,6-dialkylphenyl acetates in nitro-methane and in acetic acid have been shown to give (a) products of substitution at both the C-3 and C-4 …
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Kinetics and Speciation of Brominated Disinfection by -Products During Ozonation
… is the reaction between phenoxides and HOBr. Bromination of phenols by HOBr was found to be approximately 1000 times faster than chlorination by HOCl. Thus bromination of NOM can be a major sink of bromine species even under a low bromide condition. The new method was also applied to evaluate …
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Development of Non-covalent Chemical Probes for μ, δ and κ Opioid Receptors
… an essential building block 1-bromocodeine. The bromination of codeine affords an attractive platform for further functionalization and the synthesis of other opioid derivatives. Here we describe the development of a new methodology for the large-scale bromination of codeine under mild …
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Regioselective chlorination of cellulose esters
… substitution reaction. Though tosylation and bromination of cellulose are frequently used, they have drawbacks such as chemo- and regioselectivity issues, high cost, and difficulty in purification. We have successfully developed a method to chemo- and regioselectively chlorinate cellulose …
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Towards the Synthesis of Magnesidin
… in to the synthesis of benzyl mono and di bromination, 1,3- benzodioxoles have been established. The benzyl mono bromination is applied to synthesize the TAG molecule, which is then applied in developing a method of synthesis for β-keto esters. The azide approach was used to synthesize the …
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SYNTHESES AND ESTROGENICITY STUDY OF DIETHYLSTILBESTROL AND BISPHENOL-A ANALOGS AS POTENTIAL REPLACEMENT FOR BISPHENOL-A AND INVESTIGATION ON NOVEL REACTIONS INDUCED BY IODANE/QUATERNARY AMMONIUM HALIDES
… in nitromethane was utilized to explore aromatic bromination, N-nitrosation-dealkylation, and benzoate ester formation from benzylamines. Koser's reagent was found to be a suitable iodane for aromatic bromination reaction, whereas for N-nitrosation-dealkylation, IBX gave the best yields. Further, …
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A study in radiopaque polymeric materials
… the aromatically brominated monomer (aliphatic bromination caused UV destabilisation). For effective x-ray absorption a higher level of bromination would be necessary, but the expense of suitable compounds made further study unjustifiable. Incorporation of zinc atoms into the polymer was …
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Stereoelectronic effects in brominations of cyclopropylarenes and 9-alkylanthracenes
The free radical bromination of several cyclopropylarenes has been studied. The abstraction of a cyclopropyl hydrogen by bromine atom, which to date has been an unrecognized process, is demonstrated in this study. Specifically, when a cyclopropyl group is attached to the 9-position of an …
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Impurity profiling and synthesis of precursors to the hallucinogenic amphetamine DOB
… at some stage during synthesis of DOB. The bromination of many intermediates/starting materials was therefore also examined in detail. Bromination of the acid starting material 2,5‐dimethoxyphenylacetic acid (2,5‐PAA) was found to be clean and high yielding. This was in stark contrast to the …
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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
… This method was also extended to aromatic bromination in the synthesis of meta-bromohexestrol.
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Chemical and Physical Modifications of Semicrystalline Gels to Achieve Controlled Heterogeneity
… random SPEEK. Furthermore, the random and blocky bromination of PEEK was investigated to prepare PEEK derivatives (BrPEEK) with reactive aryl-bromides. Spectroscopic evidence revealed long domains of unfunctionalized homopolymer for blocky BrPEEK, and this translated to an increased degree of …
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Synthetic studies towards trichodermamide B: expedient synthesis enabled by arene oxide equivalents
… α–bromo oximoester electrophile and allylic bromination of an advanced, spirocyclic intermediate. This strategy has enabled access to advanced intermediates and should afford the natural product in far fewer steps than previously reported syntheses of this compound. Once complete, this …
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The asymmetric synthesis of amino acids via electrophilic glycinates
… 108 as amino acid templates is described. Bromination of 108 with NBS generates the key electrophilic glycinate 132 which couples with a variety of carbon nucleophiles with high diastereoselectivity to afford the amino acid precursors 134. Catalytic hydrogenation of homologated heterocycles …
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MODIFIED BODIPY PROBES TO EXPLORE PEROXISOME FUNCTION
… dyes. However, although many borylation and bromination reactions on meta and para methoxy substituted trifluoromethyl diazirines, were attempted these were not successful. In an alternative approach, 4-benzoylphenylboronic acid was used as the pro-photoaffinity labelling residue. This could …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… facile control of halogen identity. For both bromination and iodination, blocky halogenation of PEEK provides faster crystallization kinetics, higher glass transition (Tg) and melting temperatures as well as superior crystallizability than random halogenation. When comparing halogen identity, …
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