Patent ID: 8629280

Claim:
A composition comprising: (1) a ligand characterized by the following general formula: wherein R 1 is selected from the group consisting of optionally substituted alkyl; T is a bridging group of the general formula -(T′R 2 R 3 )—, where T′ is selected from the group consisting of carbon and silicon, R 2 and R 3 are independently selected from the group consisting of hydrogen, optionally substituted hydrocarbyl; R 4 , R 5 , and R 6 are independently selected from the group consisting of hydrogen, optionally substituted hydrocarbyl; R 7 is phenyl or substituted phenyl; (2) a metal precursor compound selected from the group consisting of (THF) 3 CrMeCl 2 , (Mes) 3 Cr(THF), [{TFA} 2 Cr(OEt 2 ] 2 , (THF) 3 CrPh 3 CrCl 3 (THF) 3 , CrCl 4 (NH 3 ) 2 , Cr(NMe 3 ) 2 Cl 3 , CrCl 3 , Cr(acac) 3 , 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, where Me=methyl, Et=ethyl, Bu=butyl, Ph=phenyl, THF=tetrahydrofuran, Mes=2,4,6-trimethylphenyl, TFA=trifluoroacetate, and acac=acetylacetonato; and (3) optionally, one or more activators, where the term substituted means a hydrogen is replaced with a group selected from the group consisting of hydroxy, alkoxy, alkylthio, phosphino, amino, halo, and silyl.