TY  - JOUR
A1  - Hünig, Siegfried
A1  - Wehner, Ingeborg
T1  - Mehrstufige reversible Redoxsysteme, LIII: 4,4'-Bipyridin-1-1'-diylbisborane
N2  - No abstract available
KW  - Bipyridinediylbisboranes / Redox systems / Cyclovoltammetry
Y1  - 1989
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-44866
ER  - 
TY  - JOUR
A1  - Hünig, Siegfried
A1  - Wehner, Ingeborg
T1  - Two Step Redox Systems LII: 2,2'-Bipyridylboronium Salts
N2  - Dications 1 derived from 2,2-bipyridine are found to exist as fully reversible two step redox systems with persistent radical ions (SEM) of high thermodynamic stability, if the bridge X forces the two pyridine rings into co planar positions. The well known derivative 1a (Diquat R) is now complemented by the boronium ions 1c and 1e -1g., as shown by voltammetry and the uv spectra of the corresponding radicals.
Y1  - 1989
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-44853
ER  - 
TY  - JOUR
A1  - Albert, Bernhard
A1  - Berning, Wilfried
A1  - Burschka, Christian
A1  - Hünig, Siegfried
A1  - Prokschy, Frank
T1  - Azobrücken aus Azinen, IV. Intramolekulare [2 + 2]-Photocycloaddition zwischen parallelen C = C- und N = N-Bindungen
T1  - Azo Bridges from Azines, IV.Intramolecular [2 + 2]-Photocycloaddition of Parallel C = C and N = N Bonds
N2  - In den starren Molekülen 1- 10 reagieren die benachbarten parallelen C = C- und N = N-Bindungen nahezu quantitativ unter Photocyclisierung lU den l,2-Diazetidinen 11-10, deren Struktur spektroskopisch und für 13 durch Kristallstrukturanalyse bewiesen wird. Die in Abwesenheit der C = C-Bindung beobachtete Photo-Denitrogenierung unterbleibt selbst bei den empfindlichen Derivaten des 2,3-Diazabicyclo[2.2.11heptens. Photocyclisierung von 6 mit lwei zur N=N· Bindung benachbarten C=C-Bindungen tritt nur mit der Norbornendoppelbindung ein.
N2  - The parallel C = C and N = N bonds in the rigid molecules 1- 10 photocyclile nearly quantitatively, forming l,2-diautidines 11-10. Their structure is confirmed by spectroscopic methods and for 13 by X-ray analysis. Radiation induced denitrogenation, the normal reaction for similar compounds without neighbouring C = C bonds, is suppressed even with the sensitive derivatives of 2,3-diazabicyclo[1.2.1)heptene. Photocyc1ization of 6, carrying two neighbouring C=C bonds, inc1udes only the norbornene bond.
KW  - Chemie
Y1  - 1984
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31314
ER  - 
TY  - JOUR
A1  - Albert, Bernhard
A1  - Berning, Wilfried
A1  - Burschka, Christian
A1  - Hünig, Siegfried
A1  - Martin, Hans-Dieter
A1  - Prokschy, Frank,
T1  - Transanulare Wechselwirkung des Azo-Chromophors inisodrinanalogen Systemen
T1  - Transanular Interactions of the Azo Chromophore in Isodrin-type Systems
N2  - No abstract available
KW  - Chemie
Y1  - 1981
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31328
ER  - 
TY  - JOUR
A1  - Hünig, Siegfried
A1  - Wehner, Ingeborg
T1  - A convenient synthesis of 2,2',6,6'-Tetramethyl-4,4'-bipyridine and its oxidation to 2,2',6,6'-Tetracarboxy-4,4'-bipyridine
N2  - No abstract available
Y1  - 1989
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-32005
ER  -