Fields of Research: PHIP

• In situ PHIP NMR - a new tool to investigate hydrogenation mediated by colloidal catalysts,
  A. Eichhorn, A. Koch, J. Bargon, Journal of Molecular Catalysis A 174 (1-2), 293-295, (2001).
  
  
  
• Observation of a stable cis-diphosphine solvate rhodium dihydride derived from PHANEPHOS

H. Heinrich, R. Giernoth, J. Bargon, J.M. Brown, Chem. Comm., 1296-1297 (2001)

• PHIP Detection of a Transient Rhodium Dihydride Intermediate in the Homogeneous Hydrogenation of Dehydroamino Acids

R. Giernoth, H. Heinrich, N.J. Adams, R.J. Deeth, J. Bargon, J.M. Brown, J. Am. Chem. Soc. 122 (49), 12381-12382 (2000).

• Synthesis of New 3-(Dialkoxyphosphoryl)butenoates and Their Enantioselective Hydrogenation,

R. Kadyrov, R. Selke, R. Giernoth, J. Bargon, Synthesis 1999, 1056-1062 (1999).
 
• Investigating the Kinetics of Homogeneous Hydrogenation Reactions Using PHIP NMR Spectroscopy,

P. Hübler, R. Giernoth, G. Kümmerle, J. Bargon, J. Am. Chem. Soc. 121, 5311-5318 (1999).

• Indirect Characterisation of Hydrogenation Intermediates Using PASADENA NMR Spectroscopy - Evolution of Zero-Quantum Coherence in AB Spin Systems,

P. Hübler, J. Natterer, J. Bargon, Ber. Bunsenges. Phys. Chem.102, 364-369 (1998).
 
• Intermediäre Produktanbindung bei der homogenen Hydrierung von Styrenderivaten mit Parawasserstoff und kationischen Rh(I)-Katalysatoren,

R. Giernoth, P. Hübler, J. Bargon, Angew. Chem. 110, 2649-2651 (1998).
 
• Intermediate Product - Catalyst Complexes in the Homogeneous Hydrogenation of Styrene Derivatives with Parahydrogen and Cationic Rh(I) Catalysts,

R. Giernoth, P. Hübler, J. Bargon, Angew. Chem. Int. Ed. Engl. 37, 2473 (1998).
 
• Investigating Catalytic Processes with Parahydrogen: Evolution of Zero-Quantum Coherence in AA-X Spin Systems,

J. Natterer, O. Schedletzky, J. Barkemeyer, J. Bargon, S.J. Glaser, J. Magn. Reson. 133, 92-97 (1998).
 
• Orthodeuterium induced polarization,

J. Natterer, T. Greve, J. Bargon, Chem. Phys. Lett. 293, 455 (1998).
 
• Study of the Mechanism of Platinum(II)Tin(II) Dichloride Mediated Hydrogenation of Alkynes and Alkenes Empolying Parahydrogen-Induced Polarization,

C. Deibele, A. B. Permin, V. S. Petrosyan, J. Bargon, Eur. J. Inorg. Chem. 1915-1923 (1998).

• Nachweis chiraler Dihydrido-Katalysator-Substrat-Komplexe während der Hydrierung von Itaconsäuredimethylester mit Bisphosphinit-Rhodium(I)-Katalysatoren,

A. Harthun, R. Kadyrov, R. Selke, J. Bargon, Angew. Chem. 109, 1155-1156 (1997).
 
• Proof of Chiral Dihydride Complexes Including Catalyst and Substrate during the Bis(phospinite)rhodium(I)-Catalyzed Hydrogenation of Dimethyl Itaconate,

A. Harthun, R. Kadyrov, R. Selke, J. Bargon, Angew. Chem. Int. Ed. Engl. 36, 1103-1105 (1997).
 
• Parahydrogen and in situ NMR-Spectroscopy as Mechanistic Tools in Catalysis,

J. Bargon, R. Giernoth, A. Harthun, C. Ulrich, in "Organic Synthesis via Organometallics" (G. Helmchen, Ed.), OSM 5, Proc. of the 5th Symp. 69 (1997).
 
• Parahydrogen Induced Polarization in the Pt(0)-Mediated Hydrogenation of Alkynes and Alkenes,

S. Klages, A.B. Permin, V. S. Petrosyan, J. Bargon, J. Organomet. Chem. 545/546, 201-205 (1997).

• Heteronuclear Polarization Transfer Using Selective Pulses During Hydrogenation with Parahydrogen,

J. Barkemeyer, J. Bargon, H. Sengstschmid, R. Freeman, J. Magn. Res. A 120, 129-132 (1996).
 
• Dynamic Model of Reaction Pathway Effects on Parahydrogen Nuclear Spin Polarization,

G. Buntkowsky, J. Bargon, H.-H. Limbach, J. Am. Chem. Soc. 118, 8677-8683 (1996).
 
• Parahydrogen Labeling as a New Analytical Method in Homogeneous Catalysis,

J. Bargon in "Applied Homogeneous Catalysis by Organometallic Complexes" (B. Cornils, W.A. Herrmann, Eds.), Vol. 2 "Developments", pp. 672-683, VCH, Weinheim, (1996).
 
• New Exication Sequence to Oberserve the PASADENA Effect,

H. Sengstschmid, R. Freeman, J. Barkemeyer, J. Bargon, J. Magn. Res. A 120, 249-257 (1996).
 
• Nachweis einer paarweisen, reversiblen Hydrierung auf a,b-ungesättigte Carbonsäurederivate mit Rhodium(I)-Katalysatoren durch in situ NMR-Spektroskopie und Parawasserstoff,

A. Harthun, R. Selke, J. Bargon, Angew. Chem. 108, 2666-2669 (1996).
 
• Proof of a reversible, pairwise hydrogen transfer during the homogeneously rhodium(I)-catalyzed hydrogenation

of a,b-unsaturated carbonic acid-derivatives using in situ NMR spectroscopy and parahydrogen,
A. Harthun, R. Selke, J. Bargon, Angew. Chem. Int. Ed. Engl.35, 2505-2507 (1996).
 
• Rhodium and palladium-catalyzed proton exchange in styrene detected in situ by para-hydrogen induced polarization,

A. Harthun, R. Giernoth, C. J. Elesvier, J. Bargon, Chem. Commun.1996, 2483 (1996).
 
• Determination of ³Jcc-Coupling Constants Using Parahydrogen Induced Polarization,

J. Natterer, J. Barkemeyer, and J. Bargon, J. Magn. Res. A 123, 253-256 (1996).

• Hetero-NMR Enhancement via Parahydrogen Labeling,

J. Barkemeyer,  M. Haake, J. Bargon, J. Am. Chem. Soc.117, 2929-2928 (1995).
 
• Symmetry Breakdown During Parahydrogen-Labeling of Symmetric Substrates: Proton Spin Polarization and Singlet/Triplet Mixing due to ¹³C-Isotopes in Natural Abundance,

M. Haake, J. Barkemeyer and J. Bargon, J. Phys. Chem. 99, 17539-17543 (1995).
 
• Homogeneous Hydrogenation of Norbornadiene with Parahydrogen and Phosphonic Ester Phosphine Rhodium Complexes studies by in situ NMR Spectroscopy,

A. Harthun, K. Woelk, J. Bargon, A. Weigt, Tetrahedron 51, 11199-11206 (1995).
 
• The Use of in situ NMR Spectroscopy and Parahydrogen as Tools for Chiral Synthesis,

A. Harthun, J. Barkemeyer, R. Selke, J. Bargon, Tetrahedron Letters 36, 7423-7426 (1995).

• In situ NMR Untersuchungen photokatalysierter Hydrierungen an Metallcarbonylverbindungen der 6. Gruppe mit Parawasserstoff,

A. Thomas, M. Haake, F.-W. Grevels, J. Bargon, Angew. Chem. 106, 820-822 (1994).
 
• In Situ NMR Investigations of Photocatalyzed Hydrogenations with Parahydrogen in the Presence of Metal Carbonyl Compounds of Group 6,

A. Thomas, M. Haake, F.-W. Grevels, J. Bargon, Angew. Chem. Int. Ed. Engl. 33, 755-757 (1994).
 
• In situ NMR Study of the Rhodium(I)-Catalyzed Hydrogenation of the Allene 1-Methoxy-propa-1,2-diene Using Parahydrogen,

A. Harthun, J. Bargon, R. Selke, Tetrahedron Letters 42, 7755-7758 (1994).

• Nuclear Magnetic Resonance Studies of Homogeneous Catalysis Using Parahydrogen: Analysis of Nuclear Singlet-Triplet Mixing as a Diagnostic Tool to Characterize Intermediates,

J. Bargon, J. Kandels, P. Kating, J. Chem. Phys. 98, 6150-6153 (1993).
 
• Ortho- and Parahydrogen Induced Nuclear Spin Polarization

J. Bargon, J. Kandels, K. Woelk, Z. Phys. Chem. 180, 65-93 (1993).
 
• Kinetic NMR Studies of Homogeneously Catalyzed Hydrogenations Using Parahydrogen Induced Polarization at Variable Pressure,

K. Woelk, J. Bargon, Z. Phys. Chem. 182, 155-165 (1993).
 
• Nuclear Singlet/Triplet Mixing During Hydrogenations with Parahydrogen: An in Situ NMR Method to Investigate Catalytic Reaction Mechanisms and Their Kinetics. 2. Homogeneous Hydrogenation of 1,4-Dihydro-1,4-epoxynaphthalene Using Different Rhodium Catalysis,

P. Kating, A. Wandelt, R. Selke, J. Bargon, J. Phys. Chem. 97, 13313-13317 (1993).

• High-pressure NMR probes for the in situ investigation of gas/liquid reactions,

K. Woelk, J. Bargon, Rev. Sci. Instrum. 63, 3307-3310 (1992).

• Kernspinpolarisation während chemischer Reaktionen mit Ortho-Wasserstoff,

J. Bargon, J. Kandels, K. Woelk, Angew. Chem. 102, 70-71 (1990).
 
• NMR Study of Nuclear Spin Polarization during Chemical Reactions with Ortho Hydrogen,

J. Bargon, J. Kandels, K. Woelk, Angew. Chem. Int. Ed. Engl.29, 58-59 (1990).
 
• NMR-Detection of Intermediates During Homogeneous Hydrogenation of Dienes Using Parahydrogen

J. Bargon, J. Kandels, P. Kating, A. Thomas, K. Woelk, Tetrahedron Letters 31, 5721-5724 (1990).

• Para Hydrogen Induced Polarization in Hydrogenation Reactions,

T. C. Eisenschmidt, R. U. Kirss, P. P. Deutsch, S. I. Hommeltoft, R. Eisenberg, J. Bargon, R. G. Lawler, A. L. Balch, J. Am. Chem. Soc.109, 8089-8091 (1987).

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