Side-Chain Fragmentation of Arylalkanol Radical Cations. Carbon−Carbon and Carbon−Hydrogen Bond Cleavage and the Role of α- and β-OH Groups

1996 ◽  
Vol 118 (25) ◽  
pp. 5952-5960 ◽  
Author(s):  
Enrico Baciocchi ◽  
Massimo Bietti ◽  
Lorenza Putignani ◽  
Steen Steenken
Keyword(s):  
Hydrogen Bond ◽  
Bond Cleavage ◽  
Radical Cations ◽  
Side Chain ◽  
Oh Groups

A Novel Role of Methanol in In-Cage Reaction of Radical Cations During Photosensitized C–C Bond Cleavage of 1,1,2,2-Tetraphenylethane

1992 ◽  
Vol 21 (5) ◽  
pp. 743-746 ◽  
Author(s):  
Katsuya Ishiguro ◽  
Toshihiko Osaki ◽  
Yasuhiko Sawaki
Keyword(s):  
Bond Cleavage ◽  
Radical Cations

The role of oxygen acidity on the side-chain fragmentation of ring methoxylated benzocycloalkenol radical cations

2003 ◽  
Vol 44 (34) ◽  
pp. 6401-6404 ◽  
Author(s):  
Monica Bellanova ◽  
Massimo Bietti ◽  
Michela Salamone
Keyword(s):  
Radical Cations ◽  
Side Chain

The role of peroxidases, radical cations and oxygen in the degradation of lignin

1987 ◽  
Vol 321 (1561) ◽  
pp. 495-505 ◽  
Keyword(s):  
Radical Cation ◽  
Active Oxygen Species ◽  
Bond Cleavage ◽  
White Rot Fungi ◽  
Radical Cations ◽  
Veratryl Alcohol ◽  
White Rot ◽  
Oxygen Species ◽  
Lignin Model

Ligninase is an extracellular peroxidase produced by several species of white-rot fungi. It is able to oxidize methoxylated substrates to radical cation intermediates that can undergo C—H or C—C bond cleavage, thereby providing the basis for the oxidation of veratryl alcohol or degradation of lignin model compounds respectively. In some cases, the radical cation intermediate can act as an oxidant, accepting an electron from a suitable donor. It can thus function as a mediator, causing oxidation in a polymer not immediately accessible to the enzyme. This could be important in the degradation of natural lignocellulose substrates. However, the removal of a single electron by a mediator would leave a radical in the polymer. We propose that oxygen will bind to this radical to generate active oxygen species. This provides a potential mechanism for the auto-oxidation of lignin at a distance from the enzyme. A scheme is presented to account for the observation that ligninase can open the ring of veratryl alcohol.

scholarly journals The role of secondary interactions on the preferred conformers of the fenchone–ethanol complex

2019 ◽  
Vol 21 (6) ◽  
pp. 2938-2945 ◽  
Author(s):  
Donatella Loru ◽  
Isabel Peña ◽  
M. Eugenia Sanz
Keyword(s):  
Hydrogen Bond ◽  
High Resolution ◽  
Weak Interactions ◽  
Side Chain ◽  
Rotational Spectroscopy ◽  
Secondary Interactions ◽  
Relative Arrangement

Three conformers of the complex formed between fenchone, a natural common odorant, and ethanol, a mimic of serine's side chain, have been identified using high resolution rotational spectroscopy. All conformers show a main O⋯H–O hydrogen bond and C–H⋯O secondary weak interactions, which drive the relative arrangement of the two moieties.

The role of the quinone in oxidative phosphorylation. Evidence against carbon-hydrogen bond cleavage

Biochemistry ◽  
1968 ◽  
Vol 7 (6) ◽  
pp. 2301-2317 ◽  
Author(s):  
Samuel J. Di Mari ◽  
Clinton D. Snyder ◽  
Henry. Rapoport
Keyword(s):  
Hydrogen Bond ◽  
Oxidative Phosphorylation ◽  
Bond Cleavage

Phase Transitions in the Crystals ofl- anddl-Cysteine on Cooling: The Role of the Hydrogen-Bond Distortions and the Side-Chain Motions. 2.dl-Cysteine

2009 ◽  
Vol 113 (15) ◽  
pp. 5262-5272 ◽  
Author(s):  
Vasil S. Minkov ◽  
Nikolay A. Tumanov ◽  
Boris A. Kolesov ◽  
Elena V. Boldyreva ◽  
Sergei N. Bizyaev
Keyword(s):  
Hydrogen Bond ◽  
Phase Transitions ◽  
Side Chain
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