1,4-Additions of tricyclic 1,4-diphosphinines – a novel system to study σ-bond activation and π–π dispersion interactions

2018 ◽  
Vol 54 (10) ◽  
pp. 1182-1184 ◽  
Author(s):  
Abhishek Koner ◽  
Zsolt Kelemen ◽  
Gregor Schnakenburg ◽  
László Nyulászi ◽  
Rainer Streubel

The reactivity of the aromatic π-system in 1,4-diphosphinineIwas explored towards [4+2]-cycloaddition reactions along with activation of organo dichalcogenides under thermal conditions.

2009 ◽  
Vol 87 (8) ◽  
pp. 1135-1143 ◽  
Author(s):  
Andrea L. F. de Sousa ◽  
José E. P. Cardoso Filho ◽  
Blanka Wladislaw ◽  
Liliana Marzorati ◽  
Claudio Di Vitta

Sulfinyltoluquinones (2a–2c) were submitted to thermal or catalyzed [4+2] cycloaddition reactions with cyclopentadiene. For p-tolylsulfinyltoluquinones (2b) and (2c), almost complete C2–C3-chemo- and unlike-diastereoselectivity was achieved by catalysis with ZnBr2, yielding adducts 6. Under thermal conditions, Diels–Alder reaction took place at the C5–C6 double bonds of quinones 2a–2c, generating mixtures of diastereoisomeric like- and unlike-adducts 4.


2007 ◽  
Vol 62 (3) ◽  
pp. 309-313 ◽  
Author(s):  
Burkhard Butschke ◽  
Maria Schlangen ◽  
Helmut Schwarz ◽  
Detlef Schröder

Electrospray ionization of solutions of dimethyl(1,5-cyclooctadiene)platinum(II) in methanol with traces of nitrogen-containing ligands L provides gaseous complexes of the type [(CH3)Pt(L)]+ with L = pyridine (py), 2,2′-bipyridine (bipy), and 1,10-phenanthroline (phen). These [(CH3)Pt(L)]+ cations are capable of activating the C-H bond in methane as shown by H/D exchange when using CD4 as a neutral reactant. Most reactive is the complex [(CH3)Pt(py)]+ bearing a monodentate nitrogen ligand. The cationic complexes [(CH3)Pt(bipy)]+ and [(CH3)Pt(phen)]+ also bring about activation of methane, though at a lower rate, whereas the bipyridine complex [(CH3)Pt(py)2]+ does not react with methane at thermal conditions. A detailed analysis of the experimental data by means of kinetic modeling provides insight into the underlying mechanistic steps, but a distinction whether the reaction occurs as σ bond metathesis or via an oxidative addition cannot be made on the basis of the experimental data available.


1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN

Sign in / Sign up

Export Citation Format

Share Document