Peter A. Morken
University of Iowa
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Featured researches published by Peter A. Morken.
Tetrahedron Letters | 1991
Peter A. Morken; Hengyao Lu; Nakamura Akihiro; Donald J. Burton
Abstract The title compounds are prepared by metallation of CF 3 CH=CF 2 with LDA or t-BuLi or by metallation of CF 3 CBr 2 CF 3 with 2 equivalents of zinc. CF 3 (C(ZnX)=CF 2 undergoes halogenation, oxidative dimerization, allylation and acylation reactions.
Journal of The Chemical Society, Chemical Communications | 1991
Peter A. Morken; Norman C. Baenziger; Donald J. Burton; Patrick C. Bachand; Charles R. Davis; Scot D. Pedersen; Steven W. Hansen
Title cumulenes 2a and 2b were prepared by reaction of CF3(Ph)CC(Br)ZnX [X = Br, CF3(Ph)CCBr–]1 with CuBr, or by oxidative coupling of 1 with FeCl3 to form 2a,b and [CF3(Ph)CCBr–]23, which can be dehalogenated with zinc to afford 2a,b; the cumulene isomers are readily separated by silica-gel chromatography, and may be prepared in good yield on a multi-gram scale.
Journal of Fluorine Chemistry | 1994
Peter A. Morken; Robert F. Campbell; Donald J. Burton
Abstract The AlCl 3 -catalyzed isomerization of CF 3 CFBrCFBrCF 3 afforded CF 3 CF 2 CBr 2 CF 3 , which upon treatment with 2 equiv. zinc in DMF underwent dehalogenation/metallation to afford a 1:1 mixture of E - and Z -CF 3 CFC(ZnX)CF 3 in 96% 19 F NMR yield. The zinc reagent exhibited poor thermal stability in DMF and completely decomposed by a β-elimination route in 24 h at 60 °C. However, the zinc reagent prepared from E - and Z -CF 3 CFCICF 3 in triglyme showed enhanced thermal stability and gave E - and Z-p -NO 2 C 6 H 4 C(CF 3 )CFCF 3 in a palladium-catalyzed coupling reaction with p -NO 2 C 6 H 4 I.
Acta Crystallographica Section C-crystal Structure Communications | 1997
Dale C. Swenson; Peter A. Morken; Donald J. Burton
The structures of (E)-1,1,1,6,6,6-hexafluoro-2,5-bis-(pentafluorophenyl)-2,3,4-hexatriene, (1), C 18 F 16 , (E) 1,1,1,2,2,7,7,8,8,8-decafluoro-3,6-diphenyl-3,4,5 octatriene, (2), C 20 H 10 F 10, and (E)-1,1,1,2,2,3,3,8,8,9,,10,10,10-tetradecafluoro-4,7 - diphenyl -4,5,6 - decatriene, (3), C 22 H 10 F 14 , confirm the trans conformation assigned by spectrophotometric methods. These trienes exhibit the central double-bond shortening observed in cumulenes. The phenyl rings are rotated slightly from the triene plane in (2) and (3) and are nearly perpendicular to the triene plane in (1). The large rotation of the perfluorophenyl rings from the triene plane is due to intramolecular steric interactions with the ortho-F atoms.
Acta Crystallographica Section C-crystal Structure Communications | 1996
Dale C. Swenson; Peter A. Morken; Donald J. Burton
The crystal structure of the subject compound shows the compound to be (E,E)-1,1,1,2,7,8,8,8-octafluoro-3,6-diphenylocta-2,6-dien-4-yne.
Tetrahedron | 1994
Donald J. Burton; Zhen-Yu Yang; Peter A. Morken
Journal of Organic Chemistry | 1993
Peter A. Morken; Donald J. Burton
Journal of the American Chemical Society | 1993
Peter A. Morken; Patrick C. Bachand; Dale C. Swenson; Donald J. Burton
Journal of Fluorine Chemistry | 1991
Zhen-Yu Yang; Peter A. Morken; Donald J. Burton
Journal of Fluorine Chemistry | 2008
Donald J. Burton; Steven W. Hansen; Peter A. Morken; Kathryn J. MacNeil; Charles R. Davis; Ling Xue