Reactions of Electrophiles with the Phosphaalkene Mes*PCH2:  Mechanistic Studies of a Catalytic Intramolecular C−H Bond Activation Reaction

2002 ◽  
Vol 21 (6) ◽  
pp. 1008-1010 ◽  
Author(s):  
Chi-Wing Tsang ◽  
Crystal A. Rohrick ◽  
Tejindra S. Saini ◽  
Brian O. Patrick ◽  
Derek P. Gates
Keyword(s):  
Bond Activation ◽  
Mechanistic Studies ◽  
Activation Reaction

Cu-catalyzed C–H Activation Reaction: One Pot Direct Synthesis of Xanthine and Uric Acid Derivatives from 5-Bromo Uracil

Synlett ◽  
2021 ◽  
Author(s):  
Habibur Rahaman ◽  
Brindaban Roy ◽  
Somjit Hazra ◽  
Biplab Mondal
Keyword(s):  
Uric Acid ◽  
Bond Activation ◽  
Direct Synthesis ◽  
One Pot ◽  
Activation Reaction

Abstract: A one pot direct synthesis of xanthine and uric acid derivates is reported. This simple yet efficient methodology illustrates concurrent formation of two C-N bonds using CuBr2 as catalyst and one of those C-N bonds is formed by uracil C6-H bond activation.

Nickel-Catalyzed Hydroalkenylation of Alkynes through C–F Bond Activation: Synthesis of 2-Fluoro-1,3-dienes

Synthesis ◽  
2017 ◽  
Vol 49 (16) ◽  
pp. 3569-3575 ◽  
Author(s):  
Junji Ichikawa ◽  
Yota Watabe ◽  
Kohei Kanazawa ◽  
Takeshi Fujita
Keyword(s):  
Bond Activation ◽  
Oxidative Cyclization ◽  
Coupling Reactions ◽  
Mechanistic Studies ◽  
Co Catalyst

2-Fluoro-1,3-dienes were synthesized through nickel-catalyzed coupling reactions between β,β-difluorostyrenes and alkynes in the presence of ZrF4 as co-catalyst and a hydride source derived from triethylborane and lithium isopropoxide. Mechanistic studies revealed that the carbon–fluorine bond was cleaved by β-fluorine elimination from intermediary nickelacyclopentenes generated through oxidative cyclization of the two substrates.

scholarly journals Rh-catalyzed decarbonylation of conjugated ynones via carbon–alkyne bond activation: reaction scope and mechanistic exploration via DFT calculations

2015 ◽  
Vol 6 (5) ◽  
pp. 3201-3210 ◽  
Author(s):  
Alpay Dermenci ◽  
Rachel E. Whittaker ◽  
Yang Gao ◽  
Faben A. Cruz ◽  
Zhi-Xiang Yu ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Bond Activation ◽  
Activation Reaction

We report a catalytic C–C bond activation of unstrained conjugated monoynonesviadecarbonylation to synthesize disubstituted alkynes.

scholarly journals Femtosecond Infrared Studies of Chemical Bond Activation

1999 ◽  
Vol 19 (1-4) ◽  
pp. 253-262 ◽  
Author(s):  
M. C. Asplund ◽  
H. Yang ◽  
K. T. Kotz ◽  
S. E. Bromberg ◽  
M. J. Wilkens ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Chemical Bond ◽  
Bond Activation ◽  
Product Formation ◽  
Organometallic Complexes ◽  
Activation Time ◽  
Activation Reaction ◽  
Infrared Studies ◽  
Important Intermediate ◽  
Solvent Complex

The identification of the intermediates observed in bond activation reactions involving organometallic complexes on time scales from femtoseconds to milliseconds has been accomplished through the use of ultrafast infrared spectroscopy. C—H bond activation by the molecule Tp*Rh(CO)2 showed a final activation time of 200 ns in cyclic solvents, indicating a reaction barrier of 8.3 kcal/mol. An important intermediate is the partially dechelated η2-Tp*Rh(CO)(S) solvent complex, which was formed 200 ps after the initial photoexcitation. Si—H bond activation by CpM(CO)3 (M=Mn, Re) showed some product formation in less than 5 ps, indicating that the Si—H activation reaction is barrierless. The activated product was formed on several timescales, from picoseconds to nanoseconds, suggesting that there are different pathways for forming final product which are partitioned by the initial photoexcitation.

ChemInform Abstract: Ruthenium-Catalyzed Oxidative Coupling of Primary Amines with Internal Alkynes Through C-H Bond Activation: Scope and Mechanistic Studies.

ChemInform ◽  
2015 ◽  
Vol 46 (39) ◽  
pp. no-no
Author(s):  
Sara Ruiz ◽  
Pedro Villuendas ◽  
Manuel A. Ortuno ◽  
Agusti Lledos ◽  
Esteban P. Urriolabeitia
Keyword(s):  
Oxidative Coupling ◽  
Bond Activation ◽  
Primary Amines ◽  
Mechanistic Studies ◽  
Internal Alkynes
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