Markus Wollenweber | Researchain

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Tetrahedron Letters | 1993

Rigid face-to-face [3.3]-oo′-cyclophanes arene/alkene and arene/arene photocycloaddition reactions

Regina Thiergardt; Manfred Keller; Markus Wollenweber; Horst Prinzbach

Proximity as origin of unusual photoreactivity is being explored: In the naphtho/ene 5 (X-ray analysis), direct or sensitized photoexcitation induce an efficient meta -addition to the naphthalene nucleus; ortho -(2,3)-addition is not enforced. Naphtho/benzo cyclophane 10 , however, is photochemically “inert”. Structurally related benzo/enes 4 and 17 undergo photoequilibration (2:1) with the respective [6+2]-cycloadducts.

Chemical Communications | 1999

Long-lived [1.1.1.1]- and [2.2.1.1]-‘Isopagodane’ dications: novel 4C/2e σ-bishomoaromatic dications†

Samidala Surya Prakash; Klaus Weber; George A. Olah; Horst Prinzbach; Markus Wollenweber; Markus Etzkorn; Torsten Voss; Rainer Herges

The dications generated from [1.1.1.1] and [2.2.1.1]isopagodane in SbF5–SO2ClF solution at –78 °C are of σ-bishomoaromatic nature (4C/2e), very similar in geometry, yet chemically different in their properties.

Angewandte Chemie | 1995

4c/3e Radical Cations with Cage‐Directed Configurations

Georg Gescheidt; Rainer Herges; Helfried Neumann; Jürgen Heinze; Markus Wollenweber; Markus Etzkorn; Horst Prinzbach

Journal of the American Chemical Society | 1995

4C/3E RADICAL CATIONS SUSTAINED IN HYDROCARBON CAGES. THE 1.1.1.1(ISO)PAGODANE CASES

Horst Prinzbach; Markus Wollenweber; Rainer Herges; Helfried Neumann; Georg Gescheidt; Reto Schmidlin

Angewandte Chemie | 1995

4c/3e‐Radikalkationen mit Käfig‐gesteuerten Konfigurationen

Georg Gescheidt; Rainer Herges; Helfried Neumann; Jürgen Heinze; Markus Wollenweber; Markus Etzkorn; Horst Prinzbach

Angewandte Chemie | 1994

Isopagodane — Vorläufer ungewöhnlicher Käfig-Ionen†

Markus Wollenweber; Rolf Pinkos; Jürgen Leonhardt; Horst Prinzbach

Angewandte Chemie | 1994

Isopagodanes—Precursors of Unusual Cage Ions

Markus Wollenweber; Rolf Pinkos; Jürgen Leonhardt; Horst Prinzbach

European Journal of Organic Chemistry | 2000

[2.2.2.2]/[2.1.1.1]Pagodanes and [1.1.1.1]/[2.2.1.1]/[2.2.2.2]Isopagodanes: Syntheses, Structures, Reactivities − Benzo/Ene- and Benzo/Benzo-Photocycloadditions

Markus Wollenweber; Markus Etzkorn; Jens Reinbold; Fabian Wahl; Torsten Voss; Johann-Peter Melder; Clemens Grund; Rolf Pinkos; Dieter Hunkler; Manfred Keller; Jürgen Wörth; Lothar Knothe; Horst Prinzbach

Chemische Berichte | 1991