439146-32-4

Upstream product

• 402-45-9 4-hydroxybenzotrifluoride 
• 174265-24-8 4-(trifluoromethyl)phenyl methoxymethyl ether 
• 439146-31-3 10-hydroxy-10-(2-methoxymethoxy-5-trifluoromethylphenyl)anthrone 

Downstream Products

• 439146-33-5 3-(9-anthracenyl)-2-hydroxy-5-(trifluoromethyl)benzaldehyde 

Relevant academic research and scientific papers

Discovery and optimization of new chromium catalysts for ethylene oligomerization and polymerization aided by high-throughput screening

High throughput screening (HTS) of a 205 member Schiff base salicylaldimine ligand library derived from salicylaldehydes bearing bulky ortho-substituents, i.e., 9-anthracenyl, 1,4,5,8-tetramethylanthracenyl or triptycenyl, reacted in-situ with (p-tolyl)CrCl2(thf)3, identified two new classes of highly active chromium based systems for the Oligomerization and polymerization of ethylene, respectively. The polymerization system comprises bidentate ortho-substituted anthracenyl Schiff bases bearing small primary or secondary alkyl imine substituents. The Oligomerization catalysts are based upon tridentate orthotriptycenyl-substituted Schiff bases with pyridylmethyl or quinolyl substituents. Validation tests confirmed polymerization productivities of up to 3000 g·mmol-1h-1bar-1 for the polymerization catalyst systems while the oligomerization catalysts gave productivities up to 10 000 g·mmol-1h-1bar -1. Key catalyst precursors have been characterized by X-ray crystallography.

Novel polymerisation catalysts

Novel complexes having the formula (I) are disclosed, wherein M is a Group 6 metal and T is its oxidation state; X represents an atom or group covalenty or ionically bonded to M; b is the valency of the atom or group X; L is a group datively bound to M, and n is from 0 to 4; Z is oxygen or sulphur; A1 to A3 are each independently N or P or CR, with the provisio that at least one is CR; R1 is a polycyclic hydrocarbyl group; Q is CR5, PR5R5 or N; each R and R5 to R7 are all independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or SiR′3 where each R′ is independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl, substituted heterohydrocarbyl, and any two or more of each R and R5 to R7 may be linked to form cyclic substituents. These complexes have utility as catalysts for the polymerisation of 1-olefins.