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Rainer Kupfer

University of Erlangen-Nuremberg

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Featured researches published by Rainer Kupfer.

Tetrahedron Letters | 1985

Polyalkoxy-2-aza-propenylium salts

Rainer Kupfer; Ernst-Ulrich Würthwein

Abstract The title compounds 3 , 8 , and 10 have been synthesised by oxygen-alkylation of the alkoxy-substituted N-methylene amides 1 , 6 , 7 , and 9 using triethyloxonium salt 2 . The stereochemistry of the new salts is discussed in terms of an competition between the 2-aza-allenium- and the 2-aza-allyl-cation structures (I) and (II).

Chemische Berichte | 1985

Synthese und Struktur von N-Acylimidsäureestern

Rainer Kupfer; Michael Nagel; Ernst-Ulrich Würthwein; Rudolf Allmann

Chemische Berichte | 1985

1-Alkoxy-2-azaallenium-Salze: Röntgenographische und quantenmechanische Strukturuntersuchungen

Rainer Kupfer; Ernst-Ulrich Würthwein; Michael Nagel; Rudolf Allmann

Chemische Berichte | 1984

Zur Struktur von N-Methylencarbonsäureamiden: Röntgenstrukturergebnisse, spektroskopische Untersuchung und quantenmechanische Berechnungen

Rudolf Allmann; Rainer Kupfer; Michael Nagel; Ernst-Ulrich Würthwein

Synthesis | 1984

A Facile Method for the Synthesis of SubstitutedN-Methylenecarboxamides and AlkylN-Methylenecarbamates

Rainer Kupfer; Stefan Meier; Ernst-Ulrich Würthwein

Chemische Berichte | 1985

Strukturuntersuchungen zum System 1,3-dialkoxy-2-aza-allenium-Ionen/1,3-Dialkoxy-2-aza-allyl-Kationen

Ernst-Ulrich Würthwein; Rainer Kupfer; Rudolf Allmann; Michael Nagel

Chemische Berichte | 1987

Synthesen, Struktur und Eigenschaften von 1,1,3‐Trialkoxy‐2‐azapropenylium‐Salzen

Magda Krestel; Rainer Kupfer; Rudolf Allmann; Ernst-Ulrich Würthwein

Synthesis | 1984

A facile method for the synthesis of substituted N-methylenecarboxamides and alkyl N-methylenecarbamates

Rainer Kupfer; Stefan Meier; Ernst-Ulrich Würthwein

Angewandte Chemie | 1983

Reactions of N‐Methylenecarboxamides with Electrophiles: 1‐Alkoxy‐2‐azaallenium Salts and N‐Acyl(methylene)ammonium Salts

Ernst-Ulrich Würthwein; Rainer Kupfer; Claus Kaliba

Chemische Berichte | 1992

1,1,3,3-Tetraalkoxy-2-azaallylium-Salze : Darstellung und stereochemische Eigenschaften

Rainer Kupfer; Stefan Meier; Ernst-Ulrich Würthwein

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Ernst-Ulrich Würthwein

University of Erlangen-Nuremberg

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Claus Kaliba

University of Erlangen-Nuremberg

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Cornelia Strobel

University of Erlangen-Nuremberg

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Horst P. Beck

University of Erlangen-Nuremberg

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Magda Krestel

Philips

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Peter H. M. Budzelaar

University of Manitoba

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