M-terphenyl ligand

Scheme 13 Attempted synthesis of phosphaquinoid compounds carrying m-terphenyl ligand [13]...

The stabilisation of organometallic complexes using m-terphenyl ligands... 

The use of bulky monodentate m-terphenyl ligands in the stabilisation of d-block organometallic compounds is surveyed. Importantly, these ligands have facilitated the isolation of hitherto unknown species containing low-coordinate centres and metal-metal multiple bonds. This review reports on these advances with emphasis on the synthesis, structural characterisation and, where possible, reactivity studies of complexes featuring metal-carbon bonds between m-terphenyl ligands and the transition metals. 

Ph2C6H3Li has led to the formation of the complex 2,6-Ph2C6FI3Y(//8-CgH8)ClLi(THF)3 (8) where the yttrium centre is bonded in an / -fashion to the COT, and the remaining coordination sites are occupied by the m-terphenyl ligand and a ClLi(THF)3 moiety.28... 

Although the aryl chemistry of the metals from groups 6-9 is well known, the utilisation of m-terphenyl ligands in the stabilisation of these species has only been explored recently. New developments within this area of chemistry have led to reports of complexes featuring novel coordination modes for the transition metals. 

Recently, Power and co-workers have extended this chemistry to form heteroleptic complexes featuring more sterically demanding m-terphenyl ligands. Reaction of [2,6-Dipp2C6H3Li]2 with two equivalents of CrCl2(THF)2 in diethyl ether led to the formation of the solvent-free chloride-bridged dimer [2,6-Dipp2C6H3Cr(p2-Cl)]2 11 (Scheme 2), which... 

The utilization of sterically demanding m-terphenyl ligands facilitated an interesting, if provocative, period in... 

Even though great advances in the chemistry of the P=P double bond have taken place over the past two decades, new and interesting diphosphenes, some utilizing sterically demanding m-terphenyl ligands continne to be reported. 

Figure 15.2 m-Terphenyl ligand shown on left IMes (Ri = R2 = methyl) and IPr (R, = isopropyl Rj = H) NHCs shown on right. 

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