Exterplex formation of poly(3,6-di-tert-butyl-9-vinylcarbazole) and its dimeric model compounds with dimethyl terephthalate studied by fluorescence spectroscopy

1993 ◽  
Vol 26 (6) ◽  
pp. 1411-1416 ◽  
Author(s):  
Yoshinobu Tsujii ◽  
Kazukiyo Takami ◽  
Akira Tsuchida ◽  
Shinzaburo Ito ◽  
Masahide Yamamoto
Keyword(s):  
Fluorescence Spectroscopy ◽  
Model Compounds ◽  
Tert Butyl ◽  
Dimethyl Terephthalate ◽  
Dimeric Model

scholarly journals Steric Effect on Dimer Radical Cation Formation of Poly(3,6-di-tert-butyl-9-vinylcarbazole) and Its Dimeric Model Compounds Studied by Laser Photolysis

1990 ◽  
Vol 22 (4) ◽  
pp. 319-325 ◽  
Author(s):  
Yoshinobu Tsujii ◽  
Kazukiyo Takami ◽  
Akira Tsuchida ◽  
Shinzaburo Ito ◽  
Yoshihiko Onogi ◽  
...  
Keyword(s):  
Radical Cation ◽  
Steric Effect ◽  
Laser Photolysis ◽  
Model Compounds ◽  
Tert Butyl ◽  
Dimeric Model ◽  
Dimer Radical Cation

Lignin-degrading enzymes

1987 ◽  
Vol 321 (1561) ◽  
pp. 461-474 ◽  
Keyword(s):  
Lignin Biodegradation ◽  
Major Research ◽  
Model Compounds ◽  
Peroxidase Isoenzymes ◽  
Cation Radicals ◽  
Radical Intermediates ◽  
Degrading Enzymes ◽  
Potential Applications ◽  
Full Complement ◽  
Dimeric Model

The substantial potential applications of lignin-degrading microbes and enzymes have spurred research on lignin biodegradation in recent years. As described here, that research has led to the discovery in the basidiomycete Phanerochaete chrysosporium of the first lignin-degrading enzymes and elucidation of their mode of action. A family of powerful extracellular peroxidase isoenzymes has been the focus of most investigations. The key catalytic reaction of these glycoproteins, in the presence of hydrogen peroxide, is one-electron oxidation of aromatic nuclei, generating unstable aryl cation radicals. These decompose via a number of reactions, which have been elucidated with dimeric model compounds for lignin. The involvement of carboncentred and peroxyl free-radical intermediates has been established. The peroxyl intermediates result from the addition of molecular oxygen to the C-centred radicals. Strong evidence for a classical peroxidase-type catalytic cycle of the ligninases has been obtained. The major research need is to identify the full complement of enzymes needed to degrade lignin to small fragments; this degradation is not accomplished by the isolated ligninases or by the crude extracellular mixture of enzymes secreted by cultures as they degrade lignin.

Carbon-13 NMR Chemical Shifts of Dimeric Model Compounds of Poly(propylene Oxide):  A Proof of Existence of the (C−H)···O Attraction

2001 ◽  
Vol 105 (13) ◽  
pp. 3277-3283 ◽  
Author(s):  
Yuji Sasanuma ◽  
Taisuke Iwata ◽  
Yasukazu Kato ◽  
Haruhisa Kato ◽  
Takashi Yarita ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Chemical Shifts ◽  
Model Compounds ◽  
Nmr Chemical Shifts ◽  
Poly Propylene ◽  
Dimeric Model

Polarographically Active Structural Fragments of Lignin. II. Dimeric Model Compounds and Lignins

2005 ◽  
Vol 24 (3) ◽  
pp. 263-278 ◽  
Author(s):  
Edward Evstigneyev ◽  
Sergey Shevchenko ◽  
Helene Mayorova ◽  
Andrew Platonov
Keyword(s):  
Model Compounds ◽  
Dimeric Model

Preparation of dimeric model compounds of lignin

1996 ◽  
Vol 32 (1) ◽  
pp. 98-99
Author(s):  
L. S. Smirnova ◽  
Kh. A. Abduazimov
Keyword(s):  
Model Compounds ◽  
Dimeric Model

Actinomin und 4.6-Didesmethyl-4.6-di-tert.-butyl-actinomin-Modellverbindungen zum Studium der Actinomycin/DNA-Wechselwirkung / Actinomine and 4,6-Didemethyl-di-tert-butyl-actinomine-Model Compounds for Studies of the Actinomycin-DNA Interaction

1971 ◽  
Vol 26 (9) ◽  
pp. 875-878 ◽  
Author(s):  
Frank Seela
Keyword(s):  
Model Compound ◽  
Dna Interaction ◽  
Methyl Groups ◽  
Model Compounds ◽  
Base Pairs ◽  
Tert Butyl ◽  
Dna Base ◽  
Dna Base Pairs

The synthesis of actinomine, a model compound for the investigation of the actinomycin-DNA interaction is discribed. In place of the pentapeptide lactone rings, actinomin has N,N-diethyl-ethylenediamine groups; it binds to DNA as strongly as actinomycin C1 (D) does. Additional replacement of the 4,6 methyl groups of the chromophore by tert-butyl residues strongly reduces the binding of actinomine to DNA. This result is consistent with intercalation of the actinomine chromophore between the DNA base-pairs, a reaction that is sterically blocked by the tert-butyl groups.

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