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Dive into the research topics where Edward W. Hagaman is active.

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Featured researches published by Edward W. Hagaman.


Tetrahedron Letters | 1980

Dimeric indoline alkaloids of a new biphenyl type

Nicole Kunesch; André Cavé; Edward W. Hagaman; Ernest Wenkert

Abstract A 13 C NMR analysis of lochnericine and the new alkaloids peceyline, peceylanine and pelankine is presented and the structures of the indoline dimers described.


Tetrahedron | 1983

The structure of callichiline

Andrew T. McPhail; Edward W. Hagaman; Nicole Kunesch; Ernest Wenkert; Jacques Poisson

Abstract The bis-indoline alkaloid callichiline and five of its derivatives were investigated by the 13C NMR spectral method and their C shifts assigned. This analysis and biogenetic considerations limited the alkaloid to two structures of which one was shown by a single-crystal X-ray crystallographic analysis of the natural base to be the actual structure of the alkaloid. Callichiline crystallizes in the monoclinic system, space group P21, with a = 8.776(3) A, b = 15.443(5) A, c = 14.145(5) A, β = 90.87(3)°, and Z = 2. Atomic positional and thermal parameters were refined by least-squares calculations to R = 0.052 over 2625 reflections measured by diffractometer.


Journal of The Chemical Society, Chemical Communications | 1973

Carbon-13 nuclear magnetic resonance spectral analysis of semibullvalene and related substances

Ernest Wenkert; Edward W. Hagaman; Leo A. Paquette; Robert E. Wingard; Ronald K. Russell

The 13C n.m.r. spectra of semibullvalene and a number of its annulated derivatives provide valuable information on the direction of the valence tautomeric equilibria in nondegenerate examples.


Magnetic Resonance in Chemistry | 1976

Pattern recognition of geminal proton nonequivalence and second-order coupling in 13C single-frequency off-resonance decoupled spectra. Assignment criteria and structure elucidation

Edward W. Hagaman


Helvetica Chimica Acta | 1976

13C‐NMR. Spectroscopy of Naturally Occuring Substances. XLII. Conformational analysis of quebrachamine‐like indole alkaloids and related substances

Ernest Wenkert; Edward W. Hagaman; Nicole Kunesch; Nai-yi Wang; Béla Zsadon


Helvetica Chimica Acta | 1975

13C-NMR. Spectroscopy of naturally occurring substances. XXXII. Vincaleucoblastine and related alkaloids.

Ernest Wenkert; Edward W. Hagaman; Bansi Lal; Gerald E. Gutowski; Allen S. Katner; Jean C. Miller; Norbert Neuss


Journal of the American Chemical Society | 1972

Carbon-13 nuclear magnetic resonance study on the biosynthesis of pyrrolnitrin from tryptophan by Pseudomonas

L. L. Martin; Heinz G. Floss; J. A. Mabe; Edward W. Hagaman; Ernest Wenkert


Tetrahedron Letters | 1976

The carbon-20 stereochemistry of pandoline and epipandoline

Jean Bruneton; André Cavé; Edward W. Hagaman; Nicole Kunesch; Ernest Wenkert


ChemInform | 1977

Voacanga alkaloids. 16. Carbon-13 nuclear magnetic resonance spectroscopy of naturally occurring substances. 43. Carbon-13 nuclear magnetic resonance analysis of bis-indoline alkaloids of two voacanga species

I. Rolland; Nicole Kunesch; Jacques Poisson; Edward W. Hagaman; F. M. Schell; Ernest Wenkert


ChemInform | 1977

CARBON-13 NMR SPECTROSCOPY OF NATURALLY OCCURING SUBSTANCES. XLII. CONFORMATIONAL ANALYSIS OF QUEBRACHAMINE-LIKE INDOLE ALKALOIDS AND RELATED SUBSTANCES

Ernest Wenkert; Edward W. Hagaman; Nicole Kunesch; N. Wang; B. Zsadon

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Ernest Wenkert

Indiana University Bloomington

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Heinz G. Floss

University of Washington

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André Cavé

Centre national de la recherche scientifique

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F. M. Schell

Indiana University Bloomington

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