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Showing 1 to 20 of 127 for “"Hydroxyl group"”.

  1. The effect of structure on the activity of the hydroxyl group in alcohols

    Mulliken, Robert SandersonMassachusetts Institute of Technology1917

    Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1917.

    mit Repository record

  2. Influence of Molecular Orientation and Surface Coverage of w-Functionalized Mercaptans on Surface Acidity

    Taylor, Charles DouglasVirginia Tech2000

    … effect that the orientation of the functional group has on surface acidity. 3-dodeycloxymercaptophenol and 4-dodecyloxymercaptophenol differ in that the hydroxyl group is substituted on different carbons of the benzene ring. The difference in substitution patterns should present the hydroxyl …

    vt Repository record

  3. Relationship Between Flavonoid Structure And Phase-II Metabolism

    Singh, RashimUniversity of Houston2010

    … of the compound. In general, the addition of hydroxyl group at C-4' reduced, whereas the addition of hydroxyl group at C-5 and/or C-7 improved the rates of glucuronidation of flavonoids by UGT1A8 and 1A9. On the other hand, the rates of glucuronidation by UGT1A1 reduced as number of hydroxyl …

    houston Repository record

  4. MODIFICATION OF XANTHENE AND SILICON ANALOGUES OF XANTHENE FLUOROPHORES FOR CHEMICAL PROBES DEVELOPMENT

    Liu, Chuangjun

    … the xanthene oxygen with a dimethylsilyl group which shows 90 nm red-shift relative to fluorescein (λabs/λem =582 nm/598 nm). These fluorophores have advantages over their oxygen counterparts because longer-wavelength allows deeper penetration of the light, causing less damage to the cells …

    siu-theses Repository record

  5. NMR STRUCTURAL INVESTIGATIONS OF AQUATIC HUMIC SUBSTANCES (PYRAZOLINE, 1,3-DIPOLAR ADDITION, NITROGEN-15).

    THORN, KEVIN ARTHUR.The University of Arizona.1984

    The hydroxyl group functionality of a series of aquatic humic and fulvic acids was examined by methylating the samples with ¹³C-enriched reagents and looking at the ¹³C NMR of the resulting methyl esters and ethers. The methylation procedure entailed methylation with ¹³C-diazomethane followed by …

    arizona-thes Repository record

  6. Stereoselective reactions of 16-Methylene 19-Norsteroids

    Kaiser, Delene AnneDepartment of Chemistry1991

    … due to the pseudo-equatorial position of the 17β-hydroxyl group. However, excellent stereoselectivity was obtained using Sharpless conditions (vanadium catalyst), which gave only the epoxide syn to the hydroxyl group, in good yields. Surprisingly, peracid epoxidation of …

    cape-town Repository record

  7. Die metatesepolimerisasie van alkyne

    Pieters, EsnaPotchefstroom University for Christian Higher Education1998

    … were obtained. The influence of the number of hydroxyl groups, the distance of the hydroxyl group from the aromatic centre, the variation of functional groups other than the hydroxyl group on the phenyl ring as well as the influence of the number of conjugated aromatic centres and the influence …

    nwu-za Repository record

  8. Synthesis and Evaluation of Trans-bilayer Cross Linking Phospholipids Based on Click (Azide-Alkyne) Chemistry

    Hosseini, YasamanBrock University2021

    … used as glycerol back bone with two available hydroxyl groups for esterification. The first esterification was done using dibutyltin oxide as catalyst and palmitoyl chloride as acylating agent on the primary hydroxyl group, sn1 position. Secondary hydroxyl group in the sn2 position of GPC was …

    brock Repository record

  9. Studies towards the synthesis of trehalamine and the effect of adjacent chiral tertiary and quaternary centers on the metal-catalyzed allylic substitution reaction

    Sebahar, Holly Lynn, author, Hegedus, Louis, advisorColorado State University. Libraries2002

    … and the steric environment shielding both the hydroxyl group and the epoxide.

    colostate Repository record

  10. Progress Toward the Synthesis of 3-Methoxyflavones as Potential Antioxidants, Neuroprotective Agents, and Trifluoromethylated 19F NMR Probes

    Alkhodier, Reem2020

    The total synthesis of polyhydroxylated flavones have proven to be challenging, due to the presence of more than one hydroxyl group. Direct cyclization was not successful in any of the attempts. However, by using a silyl protecting group, the cyclization was feasible. Other reactions like the …

    mississippi Repository record

  11. Enabling Synthesis Toward the Production of Biocompatible Magnetic Nanoparticles With Tailored Surface Properties

    Thompson, Michael ShaneVirginia Tech2007

    … central block with pendant carboxylic acid groups flanked by hydroxyl functional polyether tails were synthesized. Our intention was to investigate the activities of these copolymers as dispersants for magnetite nanoparticles in biological media. A benzyl alkoxide initiator was utilized to …

    vt Repository record

  12. Electronic tuning of site selectivity and semisynthesis of C2'-deoxyamphotericin B

    Wilcock, BrandonUniversity of Illinois at Urbana-Champaign2017

    … formation or ergosterol sequestration. The C35 hydroxyl group on AmB has been predicted to be important in the stabilization of the ion channel complex via hydrogen-bonding. A C35-deoxyAmB derivative was synthesized and evaluated for its antifungal activity, channel forming ability, and sterol …

    uiuc Repository record

  13. Πορείες συνθέσεως ενώσεων με βιολογικό ενδιαφέρον από 2Η-πυραν-3(6Η)-όνες

    Apostolopoulos, Constantinos, Αποστολόπουλος, ΚωνσταντίνοςAgricultural University of Athens1991

    … and subsequent reduction of the carbonyl group, as well as the stereochemical aspects of the addition. In conclusion when 6-methoxy-group has an axial orientation the aminoacid prefers an axial attact and the formed (by reduction) hydroxyl-group is also axially oriented. On the other hand …

    greece Repository record

  14. Synthesis and structure-activity relationships of ring D alkyl 19-norsteroids

    Loedolff, Michiel ChristiaanDepartment of Chemistry1996

    … for the stereoselective introduction of alkyl groups at C(14) and C(15), for eventual conversion of the intermediates into 14- and 15-alkyl analogues of estradiol hormones. In the first phase of this investigation, 17β-tert-butyldimethylsilyloxyestra-1,3,5(10),14-tetraen-l6-one was synthesised …

    cape-town Repository record

  15. The Synthesis of Oligodeoxyribonucleotides With Rna Ligase

    Hinton, Deborah MeetzeUniversity of Illinois at Urbana-Champaign2014

    … bond between one oligonucleotide with a 3'-hydroxyl group (the acceptor molecule) and another with a 5'-phosphate (the donor molecule). The enzyme does not require the alignment of the donor and acceptor molecules onto a complementary template strand, and the reaction can yield an unique …

    uiuc Repository record

  16. Studies on water-soluble taxol derivatives

    Zhao, ZhiyangVirginia Tech1991

    … water-soluble taxol derivatives. The C-2’ hydroxyl group of taxol was substituted with various groups to increase water solubility. The synthesized taxol derivatives, 2’-((3-sulfo-1-oxopropyl)oxy)taxol sodium salt, 2’-((4-((2-sulfoethyl)amino)-1,4-dioxobutyl)oxy)taxol sodium salt, and …

    vt Repository record

  17. Conformational Studies on Alicyclic Alcohols

    Williams , DavidPolytechnic of Wales1978

    … It is also known that the H chemical shift of an hydroxyl proton is dependent upon concentration. H NMR spectroscopy has therefore been used to study hydrogen-bonding in solution.<br/><br/>It was found previously by Becker, Liddel and Shoolery that at very high dilution in CC1 4 , the chemical …

    southwales Repository record

  18. Antioxidant Nanoparticles as Delivery Systems

    Astete R., Carlos ErnestoEngineering Science (Interdepartmental Program)2017

    … and finishing with the deprotection of the hydroxyl group of the alpha-tocopherol moiety. The antioxidant behavior of VECAR (0.0236 mM) was tested by DPPH assay which showed values similar to pure alpha-tocopherol (0.0229 mM). The values suggested full recovery of the active hydroxyl group …

    lsu-thes Repository record

  19. Investigating the modulation of oral drug absorption using in vitro models

    Biggs, Jonathan R.Aston University2003

    … chain-length, and the presence of a thiol or hydroxyl group in the side-chain increased IC50 while the presence of a hydroxyl group did not. The benzyl esters had lower or equal IC50 values compared to the parent dipeptides while the methyl esters had higher values. These results indicated …

    aston Repository record

  20. Phase transfer catalysis: catalyst screening, reaction development, and mechanism analysis

    Weintraub, RobertUniversity of Illinois at Urbana-Champaign2012

    … to be the most selective and those in which the hydroxyl group was protected generally afforded faster catalysts. The removal or augmentation of the dipole of the hydroxyl group position significantly impacted catalyst activity. For the development of an APTC [2,3]-Wittig rearrangement, …

    uiuc Repository record

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