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Geoffrey E. Hawkes

Stanford University

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Featured researches published by Geoffrey E. Hawkes.

Tetrahedron | 1974

Nuclear magnetic resonance spectroscopy Lanthanide shift reagents. Useful tools for study of conformational equilibria in solution

John D. Roberts; Geoffrey E. Hawkes; Janja Husar; Allen W. Roberts; Donald W. Roberts

Difficulties encountered in the use of lanthanide shift reagents for study of conformational equilibria of simple organic molecules in solution are reviewed. It seems clear that, despite these difficulties, significant conformational information is to be gained from the effect of these reagents on NMR chemical shifts.

Journal of Organic Chemistry | 1974

Nuclear magnetic resonance spectroscopy. Use of carbon-13 spectra to establish configurations of oximes

Geoffrey E. Hawkes; Klaus Herwig; John D. Roberts

Journal of the American Chemical Society | 1973

Nuclear magnetic resonance shift reagents. Question of the orientation of the magnetic axis in lanthanide-substrate complexes

Geoffrey E. Hawkes; Dieter Leibfritz; Donald W. Roberts; John D. Roberts

Journal of Organic Chemistry | 1974

Nuclear magnetic resonance spectroscopy. Carbon-13 chemical shifts of chlorinated organic compounds

Geoffrey E. Hawkes; Robert A. Smith; John D. Roberts

Journal of the American Chemical Society | 1973

Nuclear Magnetic Resonance Shift Reagents. Quantitative Estimates of Contact Contributions to Lanthanide-Induced Chemical-Shift Changes for exo-Norbornylamine

Geoffrey E. Hawkes; Claude Marzin; S. R. Johns; John D. Roberts

Journal of the American Chemical Society | 1975

Natural abundance nitrogen-15 nuclear magnetic resonance. Liquid nitrogen

C. H. Bradley; Geoffrey E. Hawkes; E. W. Randall; John D. Roberts

Journal of the American Chemical Society | 1994

SOLID-STATE 13C NMR EVIDENCE FOR A LARGE DEVIATION FROM LINEARITY OF THE FE-C-O UNIT IN THE CO COMPLEX WITH MYOGLOBIN

Ioannis P. Gerothanassis; Patrick J. Barrie; Michel Momenteau; Geoffrey E. Hawkes

Proceedings of the National Academy of Sciences of the United States of America | 1973

Nuclear Magnetic Resonance Shift Reagents: Abnormal 13C Shifts Produced by Complexation of Lanthanide Chelates with Saturated Amines and n-Butyl Isocyanide

Claude Marzin; Dieter Leibfritz; Geoffrey E. Hawkes; John D. Roberts

Proceedings of the National Academy of Sciences of the United States of America | 1973

Nuclear magnetic resonance shift reagents: Evidence for different mechanisms of contact contributions to 13C shifts induced by nickel and cobalt acetylacetonates with saturated amines and alcohols

S. R. Johns; Robert A. Smith; Geoffrey E. Hawkes; John D. Roberts

ChemInform | 1975

Natural Abundance Nitrogen-15 Nuclear Magnetic Resonance-Liquid Nitrogen

C. H. Bradley; Geoffrey E. Hawkes; E. W. Randall; John D. Roberts

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John D. Roberts

California Institute of Technology

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Claude Marzin

École Normale Supérieure

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Donald W. Roberts

Stanford University

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Dieter Leibfritz

University of Bremen

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Robert A. Smith

California Institute of Technology

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E. W. Randall

University of Turin

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Allen W. Roberts

Stanford University

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Janja Husar

Stanford University

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Ioannis P. Gerothanassis

University of Ioannina

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Edward W. Randall

Queen Mary University of London

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