912675-89-9

Upstream product

• 912675-87-7 2-(dihydroxyboryl)-3-methyl-2-cyclopenten-1-one 
• 41825-73-4 2-bromo-4,6-dimethylaniline 
• 70156-97-7 6-bromo-7-methyl-1,4-dioxaspiro<4.4>non-6-ene 

Downstream Products

• 912675-95-7 2-(2,5-dimethylcyclopenta-1,4-dienyl)-4,6-dimethylphenylamine 
• 912676-01-8 N-[2-(2,5-dimethyl-cyclopenta-1,4-dienyl)-4,6-dimethyl-phenyl]-4-methyl-benzenesulfonamide 

Relevant academic research and scientific papers

O-Phenylene-bridged Cp/sulfonamido titanium complexes for ethylene/1-octene copolymerization

The Suzuki-coupling reaction of 2-(dihydroxyboryl)-3,4-dimethyl-2- cyclopenten-1-one (1) and 2-(dihydroxyboryl)-3-methyl-2-cyclopenten-1-one (2) with 2-bromoaniline derivatives affords cyclopentenone compounds (3-8) from which cyclopentadiene compounds, 4,6-R′2-2-(2,5-Me 2C5H3)C6H2NH2 (9-11) and 4,6-R′2-2-(2,3,5-Me3C5H 2)C6H2NH2 (12-14) are prepared. After sulfonation of the -NH2 group with p-TsCl, metallation is carried out by successive addition of Ti(NMe2)4 and Me2SiCl2 affording o-phenylene-bridged Cp/sulfonamido titanium dichloride complexes, [4,6-R′2-2-(2,5-Me 2C5H2)C6H2NSO 2C6H4CH3)]TiCl2 (R′ = H, 21; R′ = Me, 22; R′ = F, 23) and [4,6-R′2-2- (2,3,5-Me3C5H)C6H2NSO 2C6H4CH3)]TiCl2 (R′ = H, 24; R′ = Me, 25; R′ = F, 26). The molecular structures of 24 and [2-(2,5-Me2C5H2)C6H 4NSO2C6H4CH3)]Ti(NMe 2)2 (27) are determined by X-ray crystallography. The Cp(centroid)-Ti-N angle in 24 is smaller (100.90°) than that observed for the CGC (constrained-geometry catalyst), [Me2Si(η5- Me4Cp)(NtBu)]TiCl2 (107.6°) indicating a more "constrained feature" in 24 than in the CGC. Complex 24 shows the highest activity among the newly prepared complexes in ethylene/1-octene copolymerization but it is slightly inferior to the CGC in terms of activity, comonomer-incorporation ability, and molecular weight of the obtained polymers. The Royal Society of Chemistry 2006.