Dehydrogenative polymerization of silanes to polysilanes by zirconocene and hafnocene catalysts. A new polymerization mechanism

1989 ◽  
Vol 111 (20) ◽  
pp. 8043-8044 ◽  
Author(s):  
Hee Gweon Woo ◽  
T. Don Tilley
Keyword(s):  
Polymerization Mechanism ◽  
Dehydrogenative Polymerization

scholarly journals Unexpected polymerization mechanism of dilignol in the lignin growing

2019 ◽  
Vol 6 (7) ◽  
pp. 190445 ◽  
Author(s):  
Yasuyuki Matsushita ◽  
Yuto Oyabu ◽  
Dan Aoki ◽  
Kazuhiko Fukushima
Keyword(s):  
Reaction Mechanism ◽  
Higher Plants ◽  
Phenoxy Radical ◽  
Covalent Linkage ◽  
Polymerization Mechanism ◽  
Essential Component ◽  
Radical Coupling ◽  
Unexpected Reaction ◽  
Lignin Polymerization ◽  
Dehydrogenative Polymerization

Lignin is an essential component of higher plants, which is built by the enzymatic dehydrogenative polymerization of monolignols. First, monolignol is enzymatically oxidized to produce the phenoxy radical, which can form resonance hybrids. Two radical resonant hybrids are coupled with each other to yield dilignol with various linkage types, of which the main structures are β- O -4′ ( I ), β-5′ ( II ) and β-β′ ( III ). However, the reaction mechanism behind the addition lignol radicals to dilignol is not yet fully understood. Here, we show an unexpected reaction with structure II during enzymatic dehydrogenative polymerization, which involves cleavage of a covalent linkage and creation of a new radical coupling site. This implied that the β-5 dilignol diversifies the growing pattern of lignin. This discovery elucidates a novel mechanism in lignin polymerization.

scholarly journals Understanding the Polymerization Mechanism of Glycoside-Hydrolase Family 70 Glucansucrases

2006 ◽  
Vol 281 (42) ◽  
pp. 31254-31267
Author(s):  
Claire Moulis ◽  
Gilles Joucla ◽  
David Harrison ◽  
Emeline Fabre ◽  
Gabrielle Potocki-Veronese ◽  
...  
Keyword(s):  
Glycoside Hydrolase ◽  
Glycoside Hydrolase Family ◽  
Polymerization Mechanism ◽  
Hydrolase Family

Polymerization mechanism and conformation of poly(1-butene)

Polymer ◽  
1987 ◽  
Vol 28 (6) ◽  
pp. 1037-1040 ◽  
Author(s):  
Tetsuo Asakura ◽  
Makoto Demura ◽  
Kaoru Yamamoto ◽  
Riichirô Chûjô
Keyword(s):  
Polymerization Mechanism

Advances in polymers for PLEDs: from a polymerization mechanism to industrial manufacturing

2001 ◽  
Vol 122 (1) ◽  
pp. 105-110 ◽  
Author(s):  
H. Becker ◽  
H. Spreitzer ◽  
W. Kreuder ◽  
E. Kluge ◽  
H. Vestweber ◽  
...  
Keyword(s):  
Polymerization Mechanism ◽  
Industrial Manufacturing
Sign in / Sign up

Export Citation Format

Share Document