Ion Ghiviriga

Summary

Affiliation: University of Florida
Country: USA

Publications

  1. doi request reprint 19F chemical shifts, coupling constants and conformational preferences in monosubstituted perfluoroparacyclophanes
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, 32611 7200, USA
    Magn Reson Chem 49:93-105. 2011
  2. ncbi request reprint Steric hindrance to the solvation of melamines and consequences for non-covalent synthesis
    Ion Ghiviriga
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Chem Commun (Camb) . 2002
  3. doi request reprint Conformational equilibria and barriers to rotation in some novel nitroso derivatives of indolizines and 3- and 5-azaindolizines - an NMR and molecular modeling study
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, FL 32611 7200, USA
    Org Biomol Chem 8:3518-27. 2010
  4. doi request reprint Selective excitation 1D-NMR experiments for the assignment of the absolute configuration of secondary alcohols
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, Florida 32611 7200, USA
    J Org Chem 77:3978-85. 2012
  5. doi request reprint Tautomerism of guanidines studied by (15)N NMR: 2-hydrazono-3-phenylquinazolin-4(3H)-ones and related compounds
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, FL 32611 7200, USA
    Org Biomol Chem 7:4110-9. 2009
  6. doi request reprint Mono- and difluorinated 1,1,2,2,9,9,10,10-octafluoro[2.2]paracyclophanes (AF4s)-A (1)H and (19)F NMR study
    Ion Ghiviriga
    University of Florida, Chemistry Department, Gainesville, FL 32611 7200, USA
    Magn Reson Chem 47:313-21. 2009
  7. ncbi request reprint An unexpected reaction of trimethylsilyl fluorosulfonyldifluoroacetate (TFDA) with imidazoles. Formation of N-difluoromethylthioureas
    Wei Xu
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Org Lett 8:5549-51. 2006
  8. ncbi request reprint A highly pyramidalized cage alkene formed via the double Diels-Alder cycloaddition of syn-4,5,13,14-bis(dehydro)octafluoroparacyclophane to anthracene
    William R Dolbier
    Department of Chemistry, University of Florida, P O Box 117200, Gainesville, Florida 32611 7200, USA
    J Org Chem 70:10336-41. 2005
  9. ncbi request reprint Carbon dioxide cleavage across a tungsten-alkylidyne bearing a trianionic pincer-type ligand
    Stella A Gonsales
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 45:15783-15785. 2016
  10. doi request reprint Organogold oligomers: exploiting iClick and aurophilic cluster formation to prepare solution stable Au₄ repeating units
    Xi Yang
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 44:11437-43. 2015

Collaborators

  • William R Dolbier
  • Peter J Steel
  • Wei Xu
  • Alan Roy Katritzky
  • Tomas Hudlicky
  • Claudio F Tormena
  • S F Wnuk
  • Khalil A Abboud
  • Adam S Veige
  • Stella A Gonsales
  • Andrew R Powers
  • Matthew E O'Reilly
  • Sudarsan VenkatRamani
  • Xi Yang
  • Soufiane S Nadif
  • Mary E Garner
  • Weihong Tan
  • Gianna N Di Francesco
  • Amrita B Mullick
  • Soumya Sarkar
  • David R Snead
  • Lianhao Zhang
  • Kai K Li
  • Iwona A Kaluzna
  • Tomohiro Kubo
  • Brent S Sumerlin
  • Xigao Chen
  • Weijia Niu
  • Matias E Pascualini
  • Shanshan Wang
  • Bernhard J Paul
  • Leslie J Murray
  • Aleth Gaillard
  • Trevor J Del Castillo
  • Yun Min Chang
  • Subramaniam Kuppuswamy
  • Kevin P McGowan
  • Katsu Ogawa
  • Sukwon Hong
  • Nigel G J Richards
  • William T Beeson
  • Brent D Feske
  • Jon D Stewart
  • Weerawut Wittayanan
  • Jerremey Willis
  • Theodore A Martinot

Detail Information

Publications32

  1. doi request reprint 19F chemical shifts, coupling constants and conformational preferences in monosubstituted perfluoroparacyclophanes
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, 32611 7200, USA
    Magn Reson Chem 49:93-105. 2011
    ..Understanding the conformational preferences of PFPCs and how they are reflected by the coupling constants facilitates the assignment of (19)F chemical shifts in monosubstituted PFPCs and the identification of the disubstituted products...
  2. ncbi request reprint Steric hindrance to the solvation of melamines and consequences for non-covalent synthesis
    Ion Ghiviriga
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Chem Commun (Camb) . 2002
    ....
  3. doi request reprint Conformational equilibria and barriers to rotation in some novel nitroso derivatives of indolizines and 3- and 5-azaindolizines - an NMR and molecular modeling study
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, FL 32611 7200, USA
    Org Biomol Chem 8:3518-27. 2010
    ..Molecular modelling demonstrated that in 1-nitrosoindolizines, the position of the conformational equilibrium is due to steric effects, while for 3-nitrosoindolizines electronic effects prevail...
  4. doi request reprint Selective excitation 1D-NMR experiments for the assignment of the absolute configuration of secondary alcohols
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, Florida 32611 7200, USA
    J Org Chem 77:3978-85. 2012
    ..Typically, the analysis takes less than 30 min. A longer mixing time, selective excitation of other signals, or NOESY1D experiments can be used for measuring ΔδRS of other protons...
  5. doi request reprint Tautomerism of guanidines studied by (15)N NMR: 2-hydrazono-3-phenylquinazolin-4(3H)-ones and related compounds
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, FL 32611 7200, USA
    Org Biomol Chem 7:4110-9. 2009
    ..2-Hydrazino-benzimidazole derivative 12 and 2-hydrazino-4,6-dimethylpyrimidine derivative 13 were found to exist predominantly as the amino tautomers...
  6. doi request reprint Mono- and difluorinated 1,1,2,2,9,9,10,10-octafluoro[2.2]paracyclophanes (AF4s)-A (1)H and (19)F NMR study
    Ion Ghiviriga
    University of Florida, Chemistry Department, Gainesville, FL 32611 7200, USA
    Magn Reson Chem 47:313-21. 2009
    ..These features have been used to assign the regiochemistry of the pseudo-ortho, pseudo-meta and pseudo-para-difluoro AF4s 2-4. It has also been demonstrated that SCS for the bridge fluorines can be used as well for this assignment...
  7. ncbi request reprint An unexpected reaction of trimethylsilyl fluorosulfonyldifluoroacetate (TFDA) with imidazoles. Formation of N-difluoromethylthioureas
    Wei Xu
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Org Lett 8:5549-51. 2006
    ..reaction: see text]...
  8. ncbi request reprint A highly pyramidalized cage alkene formed via the double Diels-Alder cycloaddition of syn-4,5,13,14-bis(dehydro)octafluoroparacyclophane to anthracene
    William R Dolbier
    Department of Chemistry, University of Florida, P O Box 117200, Gainesville, Florida 32611 7200, USA
    J Org Chem 70:10336-41. 2005
    ..This cage compound, although stable indefinitely as a crystalline compound in air, exhibits the high reactivity with both triplet and singlet O2 in solution that is characteristic of such highly pyramidal pi systems...
  9. ncbi request reprint Carbon dioxide cleavage across a tungsten-alkylidyne bearing a trianionic pincer-type ligand
    Stella A Gonsales
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 45:15783-15785. 2016
    ..Complex 6 was characterized by multinuclear NMR, IR, and single crystal X-ray diffraction...
  10. doi request reprint Organogold oligomers: exploiting iClick and aurophilic cluster formation to prepare solution stable Au₄ repeating units
    Xi Yang
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 44:11437-43. 2015
    ..The degree of polymerization within complex 8 is temperature and concentration dependent, as determined by (1)H DOSY NMR. Complex 8 is a rare example of a solution stable higher ordered structure linked by aurophilic interactions...
  11. doi request reprint Au-iClick mirrors the mechanism of copper catalyzed azide-alkyne cycloaddition (CuAAC)
    Andrew R Powers
    Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, FL 32611, USA
    Dalton Trans 44:14747-52. 2015
    ..Rate inhibition by the addition of free triphenylphosphine to the reaction indicates that ligand dissociation is a prerequisite for the reaction. The mechanistic conclusions mirror those proposed for the CuAAC reaction. ..
  12. doi request reprint Introducing "Ynene" Metathesis: Ring-Expansion Metathesis Polymerization Leads to Highly Cis and Syndiotactic Cyclic Polymers of Norbornene
    Soufiane S Nadif
    Center for Catalysis, Department of Chemistry, University of Florida, P O Box 117200, Gainesville, Florida 32611, United States
    J Am Chem Soc 138:6408-11. 2016
    ..Comparison of the intrinsic viscosity, radius of gyration, and elution time of the synthesized cyclic polynorbornene with those of linear analogues provides conclusive evidence for a cyclic topology. ..
  13. pmc N-heterocyclic carbene gold(I) and silver(I) complexes bearing functional groups for bio-conjugation
    Mary E Garner
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 44:1914-23. 2015
    ..Complete spectroscopic characterization of the ligands and complexes was achieved using (1)H and (13)C NMR, gHMBC, ESI-MS, and combustion analysis...
  14. doi request reprint Human cancerous and healthy cell cytotoxicity studies of a chiral μ-dicarbene-digold(I) metallamacrocycle
    Amrita B Mullick
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 42:7440-6. 2013
    ..The complex 8-(+/-) is characterized by a combination of NMR techniques (gDQCOSY, gHSQC, gHMBC and ROESY), single crystal X-ray diffraction, and combustion analysis...
  15. doi request reprint Unusually stable tungstenacyclobutadienes featuring an ONO trianionic pincer-type ligand
    Matthew E O'Reilly
    University of Florida, Department of Chemistry, Center for Catalysis, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 42:3326-36. 2013
    ..Single crystal X-ray analysis of 5, 6, 7, and 8 provides insight into possible steric inadequacies within the CF(3)-ONO(3-) ligand to promote catalytic metathesis...
  16. ncbi request reprint Atropisomerism of a monosubstituted perfluoro[2.2]paracyclophane. A combined synthetic, kinetic, spectroscopic and computational study
    Ion Ghiviriga
    Department of Chemistry, University of Florida, Gainesville, FL 32611 7200, USA
    Org Biomol Chem 10:882-9. 2012
    ..Enol product 5 was cyclized, under basic conditions, to form a benzofuran product 6. Its structure was confirmed by NMR, with further structural and mechanistic insights being provided by calculations...
  17. ncbi request reprint Synthesis of novel pentafluorosulfanylfurans. Two retro-Diels-Alder approaches
    William R Dolbier
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Org Lett 8:5573-5. 2006
    ..Also, a tandem cycloaddition/retrocycloaddition reaction between 4-phenyloxazole and 1-pentafluorosulfanylhex-1-yne was used to prepare 3-pentafluorosulfanyl-4-butylfuran. [reaction: see text]...
  18. ncbi request reprint C-aminoimidoylation and C-thiocarbamoylation of esters, sulfones, and ketones
    Alan R Katritzky
    University of Florida, Department of Chemistry, Gainesville, Florida 32611 7200, USA
    J Org Chem 72:6742-8. 2007
    ..The present work represents the first systematic approach to these compound classes, the few previously known examples of which were obtained by diverse approaches...
  19. doi request reprint A new ONO(3-) trianionic pincer ligand with intermediate flexibility and its tungsten alkylidene and alkylidyne complexes
    Sudarsan VenkatRamani
    Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611, USA
    Dalton Trans 44:18475-86. 2015
    ..DFT computations permit comparison of the inorganic enamine effect within alkylidynes supported by all three trianionic-pincer type ONO ligands. ..
  20. doi request reprint Fast "wittig-like" reactions as a consequence of the inorganic enamine effect
    Stella A Gonsales
    Department of Chemistry, Center for Catalysis, University of Florida, P O Box 117200, Gainesville, Florida 32611, United States
    J Am Chem Soc 137:4840-5. 2015
    ..In the case of acetone the oxo-vinyl complex results in two rotational isomers 10syn and 10anti. The rate of isomerization was determined for the forward and reverse directions and was complimented with DFT calculations. ..
  21. doi request reprint Inorganic click (iClick) synthesis of heterotrinuclear Pt(II)/Au(I)2 complexes
    Andrew R Powers
    University of Florida, Center for Catalysis, Department of Chemistry, P O Box 117200, Gainesville, Florida 32611, USA
    Dalton Trans 42:14963-6. 2013
    ..In addition, a discussion regarding the connection between traditional azide-alkyne cycloaddition reactions and iClick is presented focusing on applications towards linking multiple metal ions...
  22. ncbi request reprint A New ONO(3-) Trianionic Pincer-Type Ligand for Generating Highly Nucleophilic Metal-Carbon Multiple Bonds
    Matthew E O'Reilly
    Department of Chemistry, Center for Catalysis, University of Florida, P O Box 117200, Gainesville, Florida 32611, United States
    J Am Chem Soc 134:11185-95. 2012
    ..For complex 2, the Lewis acids MeOTf, Me(3)SiOTf, and B(C(6)F(5))(3) catalyze isobutylene expulsion to yield the tungsten-oxo complex [CF(3)-ONO]W(O)((n)Pr) (6)...
  23. ncbi request reprint Expedient synthesis of N-Z-pyroglutamyl-amino acid derivatives
    Alan R Katritzky
    Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611 7200, USA
    Bioorg Med Chem Lett 17:6000-2. 2007
    ..Structures are supported by 2D NMR studies and by comparison with the same products prepared by direct coupling of the C-terminus activated N-pGlu 1b and free amino acids 2a-c...
  24. doi request reprint A new route to acyclic diaminocarbenes via lithium-halogen exchange
    David R Snead
    Department of Chemistry, University of Florida, P O Box 117200, Gainesville, Florida 32611 7200, USA
    Org Lett 11:3274-7. 2009
    ..Rh-ADC complex 4 is an effective catalyst for the 1,2-addition of aryl boronic acids to aryl aldehydes...
  25. ncbi request reprint Reactions of nucleophiles with perfluoro[2.2]paracyclophane
    Lianhao Zhang
    Department of Chemistry, P O Box 117200, University of Florida, Gainesville, Florida 32611 7200, USA
    J Org Chem 74:6831-6. 2009
    ..All reactions appear to proceed via S(N)Ar mechanisms; reactivity issues are discussed including the effect of substituents on reactivity and regiochemistry of substitution...
  26. ncbi request reprint Remarkable efficiency of the aryne chemistry of (dehydro)octafluoro[2.2]paracyclophane when using the Cadogan method
    William R Dolbier
    Department of Chemistry, University of Florida, P O Box 117200, Gainesville, Florida 32611 7200, USA
    J Org Chem 72:550-8. 2007
    ..Surprisingly, no ene reactivity was observed with the Cram methodology. This mechanistic conundrum was examined extensively with no unambiguous explanation for the difference in reactivity being found...
  27. doi request reprint Through-space (19) F-(15) N couplings for the assignment of stereochemistry in flubenzimine
    Ion Ghiviriga
    Chemistry Department, University of Florida, Gainesville, FL, USA
    Magn Reson Chem 54:592-6. 2016
    ..Copyright © 2016 John Wiley & Sons, Ltd. ..
  28. doi request reprint Modeling biological copper clusters: synthesis of a tricopper complex, and its chloride- and sulfide-bridged congeners
    Gianna N Di Francesco
    Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611 7200, United States
    Inorg Chem 53:4647-54. 2014
    ..095, A ∼ 33 G) observed at room temperature in EPR spectra of the one-electron chemically reduced complex, [Cu3(μ3-S)L](-). ..
  29. ncbi request reprint An OCO(3-) Trianionic Pincer Tungsten(VI) Alkylidyne: Rational Design of a Highly Active Alkyne Polymerization Catalyst
    Soumya Sarkar
    Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
    J Am Chem Soc 134:4509-12. 2012
    ..05 × 10(6) g(PPA) mol(cat)(-1) h(-1)),and yield (87%) for the polymerization of 1-ethynyl-4-fluorobenzene...
  30. ncbi request reprint Stereoselective, biocatalytic reductions of alpha-chloro-beta-keto esters
    Iwona A Kaluzna
    Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
    J Org Chem 70:342-5. 2005
    ....
  31. ncbi request reprint A convenient gHMQC-based NMR assay for investigating ammonia channeling in glutamine-dependent amidotransferases: studies of Escherichia coli asparagine synthetase B
    Kai K Li
    Department of Chemistry, University of Florida, Gainesville, Florida 32611 7200, USA
    Biochemistry 46:4840-9. 2007
    ....
  32. ncbi request reprint Synthesis, structure, and biological evaluation of novel N- and O-linked diinositols
    Bernhard J Paul
    University of Florida, Department of Chemistry, PO Box 117200, Gainesville, Florida 32611, USA
    J Am Chem Soc 124:10416-26. 2002
    ..One of the attendant benefits of the preparation of these compounds has been expressed in the design and synthesis of new salen catalysts whose effectiveness has been compared with Jacobsen's catalyst in the epoxidation of styrene...