Title of article :
Bimacrocyclic NHC transition metal complexes
Author/Authors :
Ole Winkelmann، نويسنده , , Christian N?ther، نويسنده , , Ulrich Lüning، نويسنده ,
Issue Information :
دوفصلنامه با شماره پیاپی سال 2008
Abstract :
The preparation of seven concave NHC metal complexes derived from bimacrocyclic imidazolinium salt 1 is reported. The silver complex 2, obtained in 86% yield by reacting 1 with silver(I) oxide, was used to give copper complex 3, rhodium complex 5 and iridium complex 6 by transmetalation in good yields. Palladium complex 4 was obtained by reaction of the azolium salt 1 with palladium dichloride in 3-chloropyridine. The rhodium and iridium dicarbonyl complexes 7 and 8 were prepared via ligand exchange from the COD complexes 5 and 6. Silver complex 2, copper complex 3 and palladium complex 4 were characterized by single-crystal X-ray analysis. Silver complex 2 and copper complex 3 were tested in the cyclopropanation of styrene and indene with EDA (ethyl diazoacetate), where good results were obtained with 3, while low conversion and catalyst decomposition was observed with 2.
Keywords :
Bimacrocycles , transmetalation , Homogeneous catalysis , Cyclopropanation , N-heterocyclic carbenes , carbenes
Journal title :
Journal of Organometallic Chemistry
Journal title :
Journal of Organometallic Chemistry