Chromium complex and catalyst therefrom

A catalyst system comprising a) a source of chromium selected from the group consisting of CrCl3(THF)3(trichlorotris(tetrahydrofuran)chromium), CrBr3(THF)3, CrI3(THF)3, CrCl3, CrBr3, CrI3, CrCl2, CrCl2(THF)2, Cr(acac)3(chromium (III) acetylacetonate), Cr(acetate)3(chromium (III) acetate), Cr(2-ethylhexanoate)3(chromium (III) 2-ethylhexanoate), (THF)3CrMeCl2, (Mes)3Cr(THF), ((TFA)2Cr(OEt)2)2, (THF)3CrPh3, Cr(NMe3)2Cl3, Cr(neopentyl)3(THF)3, Cr(CH2—C6H4-o-NMe2)3, Cr(TFA)3, Cr(CH(SiMe3)2)3, Cr(Mes)2(THF)3, Cr(Mes)2(THF)Cr(Mes)2(THF)2, Cr(Mes)Cl(THF)2, Cr(Mes)Cl(THF)0.5, Cr(p-tolyl)Cl2(THF)3, Cr(diisopropylamide)3, Cr(picolinate)3, Cr(NO3)3, Cr(hexafluoroacetylacetonato)3, (THF)3Cr(η2-2,2″biphenyl)Br, Cr(CO)6, Cr(CO)3(THF)3, Cr(CO)3(NCCH3)3, (benzene)Cr(CO)3, (toluene)Cr(CO)3chromium (III) acetylacetonate, chromium (III) acetate and mixtures thereof;

• b) one or more activators selected from the group consisting of neutral Lewis acids, Group 13 metal and metalloid compounds;
• polymeric alumozanes;
• oligomeric alumoxanes;
• aluminates;
• and, c) at least one phosphacycle-containing ligating compound of the formula:
• wherein:
• R5 attached to N is independently C1-40 substituted or unsubstitued alkyl, C1-40 substituted or unsubstituted aryl;
• each R5 attached to the phenyl group is independently halogen, C1-40 substituted or unsubstituted alkyl, C1-40 substituted or unsubstituted aryl;
• n is an integer from 0 to 5;
• and each X″ is independently hydrogen, halogen, C1-4 aldyl or substituted alkyl, C6-10 aryl or substituted aryl, cyano or nitro.