Heterocyclic ligand

As well as phosphorus ligands, heterocyclic carbenes ligands 10 have proven to be interesting donor ligands for stabilization of transition metal complexes (especially palladium) in ionic liquids. The imidazolium cation is usually presumed to be a simple inert component of the solvent system. However, the proton on the carbon atom at position 2 in the imidazolium is acidic and this carbon atom can be depro-tonated by, for example, basic ligands of the metal complex, to form carbenes (Scheme 5.3-2). 

Relevant to the quest for molybdopterin-related ligands, heterocycle-substituted trithiocarbonates were shown to give modest yields of the CpCo (dithiolene) when treated with CpCo(cod) (cod = 1,5-cyclooctadiene, Eq. 26) (85). 

The chemistry of chemokine receptor ligands (heterocycles as receptor antagonists) 03CRV3733. 

Multidentate Macrocyclic Ligands HETEROCYCLES DONOR ATOMS FUNCTIONAL GROUPS... 

As well as phosphorus ligands, heterocyclic carbene ligands 10 have proven to be interesting donor ligands for stabilization of transition metal complexes (especially palladium) in ionic liquids. The imidazolium cation is usually presumed to... 

C. Transition metal complexes containing 7c-bonded heterocyclic ligands Heterocyclic compounds are known which may act as 5- or 6-electron ligands. They are discussed here because they come conveniently after 5-and 6-electron hydrocarbon ligands. 

The neutral radical 11.12 is an interesting heterocyclic analogue of 2,2 -bipyridyl. This paramagnetic (spin-bearing) ligand forms an N, -chelated complex with bis(hexafluoroacetylacetonato)cobalt(ir). ... 

The Ti -coordinated Mn(CO)3 cationic complexes of thiophenes follow mainly from the direct interaction of a heterocyclic ligand with Mn(CO)5X (81HCA1288). The first successful synthesis of 79 (R = = H = Me, R = R" =... 

---