Patent ID: 8138348

Claim:
A composition comprising: (1) a ligand selected from the group consisting of the ligands represented by the (2) a metal precursor compound selected from the group consisting of (THF) 3 CrMeCl 2 , (Mes) 3 Cr(THF) (Mes=mesityl=2,4,6-trimethylphenyl), [{TFA} 2 Cr(OEt 2 )] 2 (TFA=trifluoroacetate), (THF) 3 CrPh 3 , CrCl 3 (THF) 3 , CrCl 4 (NH 3 ) 2 , Cr(NMe 3 ) 2 Cl 3 , CrCl 3 , Cr(acac) 3 (acac =acetylacetonato), Cr(2-ethylhexanoate) 3 , Cr(neopentyl) 4 , Cr(CH 2 —C 6 H 4 -o-NMe 2 ) 3 , Cr(TFA) 3 , Cr(CH(SiMe 3 ) 2 ) 3 , Cr(Mes) 2 (THF) 3 , Cr(Mes) 2 (THF), Cr(Mes)Cl(THF) 2 , Cr(Mes)Cl(THF) 0.5 , Cr(p-tolyl) Cl 2 (THF) 3 , Cr(diisopropylamide) 3 , Cr(picolinate) 3 , [Cr 2 Me 8 ][Li(THF)] 4 , CrCl 2 (THF), Cr(NO 3 ) 3 , [CrMe 6 ][Li(Et 2 O)] 3 , [CrPh 6 ][Li(THF)] 3 , [CrPh 6 ][Li(n-Bu 2 O)] 3 , [Cr(C 4 H 8 ) 3 ][Li(THF)] 3 , CrCl 2 , Cr(hexafluoroacetylacetonato) 3 , (THF) 3 Cr(η 2 -2,2′-Biphenyl)Br and mixtures thereof; and (3) optionally, one or more activators.