Oxidative addition reactions of compounds of the type (.eta.5-C5Me5)Os(CO)LR (L = CO, PMe2Ph; R = alkyl). The role of oxidized intermediates in electrophilic cleavage reactions of osmium-carbon .sigma.-bonds

1988 ◽  
Vol 7 (12) ◽  
pp. 2469-2475 ◽  
Author(s):  
Laura J. Johnston ◽  
Michael C. Baird
Keyword(s):  
Oxidative Addition ◽  
Addition Reactions ◽  
Cleavage Reactions ◽  
Sigma Bonds

Mechanistic investigations on C–H activated dealkylating cyclo-amination reactions of substituted triazenes, formamidines and amidines

2020 ◽  
Vol 75 (6-7) ◽  
pp. 651-664
Author(s):  
Silvio Preusser ◽  
Diana Kalden ◽  
Felix Wendler ◽  
Paul R. W. Schönherr ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Mechanism ◽  
Transition Metals ◽  
Oxidative Addition ◽  
Addition Reactions ◽  
Cyclization Reactions ◽  
Substitution Pattern ◽  
Catalytic Cyclization ◽  
High Yields

AbstractCatalytic dealkylating cycloamination reactions of N1-methylated-N1,N3-diarylated triazenes proceed via two subsequent oxidative addition reactions, regioselectivity producing benzotriazoles by C–H and C–Br activation steps. Whereas palladium-based catalysis in the presence of dealkylating reagents and directing phosphane ligands leads to high yields, the homologous metals nickel and platinum as well as other 3d transition metals show only poor catalytic activity in similar procedures. Starting compounds have been widely varied to introduce potentially competing reaction sites and to investigate the reaction mechanism of the catalytic cyclization reactions. Yields of the benzotriazole synthesis strongly depend on the electronic and steric properties of the directing phosphane ligands, the nature of the dealkylating bases and the substitution pattern in 2- and 4-position of the aryl groups of the starting triazenes. In order to clarify the role of the catalyst, palladium-based intermediates were identified. Finally, formamidines and bulky amidines were tested in related C–H activated dealkylating cycloamination reactions.

Oxidative addition reactions of an iridium(I) complex containing phosphine-NHC

Polyhedron ◽  
2021 ◽  
Vol 198 ◽  
pp. 115083
Author(s):  
Aziza Ahmida ◽  
Fatin M. Elmagbari ◽  
Hans Egold ◽  
Gerald Henkel
Keyword(s):  
Oxidative Addition ◽  
Addition Reactions

scholarly journals The role of hypervalent iodine(iii) reagents in promoting alkoxylation of unactivated C(sp3)–H bonds catalyzed by palladium(ii) complexes

2021 ◽  
Author(s):  
Payam Abdolalian ◽  
Samaneh K. Tizhoush ◽  
Kaveh Farshadfar ◽  
Alireza Ariafard
Keyword(s):  
Dft Calculations ◽  
Oxidative Addition ◽  
Hypervalent Iodine

This work uses DFT calculations to explore Pd(ii)-catalysed iodine(iii)-mediated alkoxylation of unactivated C(sp3)–H bonds and reveals how important the isomerization is in triggering the oxidative addition of ArIX2 to Pd(ii).

Reactions of the Ni(0) Compound Ni(PPh3)4 with Unactivated Alkyl Halides: Oxidative Addition Reactions Involving Radical Processes and Nickel(I) Intermediates

2018 ◽  
Vol 37 (15) ◽  
pp. 2450-2467 ◽  
Author(s):  
Ryley Kehoe ◽  
Markshun Mahadevan ◽  
Adeela Manzoor ◽  
Gillian McMurray ◽  
Patrick Wienefeld ◽  
...  
Keyword(s):  
Oxidative Addition ◽  
Alkyl Halides ◽  
Addition Reactions ◽  
Radical Processes
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