Patent ID: 6750345
Filing Date: 2004-06-15
Classification: B01J,C07B,C07D,C07F,C08F,C40B

Abstract:
A composition comprising:(1) a ligand characterized by the following general formula: â€ƒwherein R1 is characterized by the general formula: â€ƒwherein E is either carbon or nitrogen, Q1 and Q5 are substituents on the R1 ring at a position ortho to E, with Q1 and Q5 are independently selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl and silyl, but provided that Q1 and Q5 are not both methyl; Qâ€³q represents additional possible substituents on the ring, with q being 1, 2, 3, 4 or 5 and Qâ€³ being selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted hetercycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxyl, aryloxyl, silyl, boryl, phosphino, amino, thio, seleno, halide, nitro, and combinations thereof, T is a bridging group selected group consisting of â€”CR2R3â€” and â€”SiR2R3â€” with R2 selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted hetercycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxyl, aryloxyl, silyl, boryl, phosphino, amino, thio, seleno, halide, nitro, and combinations thereof; R3 selected from the group consisting of aryl, substituted aryl, heteroaryl, and substituted heteroaryl; and provided that R2 is different from R3; Jâ€³ is selected from the group consisting of heteroaryl and substituted heteroaryl; (2) a metal precursor compound characterized by the general formula M(L)n wherein M is either hafnium or zirconium and each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulphates, ethers, thioethers and combinations thereof or optionally two or more L groups are joined into a ring structure; n is 1, 2, 3, 4, 5, or 6; and (3) optionally, at least one activator.