Arylphenoxy catalyst system for producing ethylene homopolymer or copolymers of ethylene and a-olefins
A technology of arylphenoxy series and ethylene homopolymer, which is applied in the field of arylphenoxy catalyst system, can solve problems such as the role of aryl substituents that have not been explained, and achieve high yield, excellent thermal stability, and easy Effect of treatment
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Embodiment 1
[0094] Synthesis of 2-phenyl-4-fluorophenol
[0095] After adding 2-bromo-4-fluorophenol (4.16 g, 20.32 mmol, Aldrich) to the flask, a nitrogen stream was introduced into the flask. Then, palladium acetate (0.22 g, 1.02 mmol), potassium phosphate (21.00 g, 91.19 mmol), phenylboronic acid (2.97 g, 24.36 mmol), triphenylphosphine (0.80 g, 3.06 mmol) were added to the flask. Dimethoxyethane (32 mL) and distilled water (8 mL) were added thereto and stirred well. The mixture was heated to 50°C and stirred for 6 hours. When the reaction was completed, the mixture was cooled at room temperature, and then the organic layer was separated from the mixture using diethyl ether (10 mL×3) and water. Magnesium sulfate was added to the separated organic layer, followed by stirring for 30 minutes. The mixture was filtered to remove volatiles from the mixture. The residue was added to a dry flask and dissolved in dichloromethane. After lowering the temperature to -78°C, boron tribromide (3...
Embodiment 2
[0101] Synthesis of 2-(4-trifluoromethylphenyl)phenol
[0102] After adding 4-trifluoromethylbromobenzene (4.57 g, 20.32 mmol, Aldrich) to the flask, a nitrogen stream was introduced into the flask. Then, palladium acetate (0.22 g, 1.02 mmol), potassium phosphate (21.00 g, 91.19 mmol), 2-methoxyboronic acid (3.71 g, 20.32 mmol, Aldrich), triphenylphosphine (0.80 g, 3.06 mmol). Dimethoxyethane (32 mL) and distilled water (8 mL) were added thereto and stirred well. The mixture was heated to 50°C and stirred for 6 hours. When the reaction was completed, the mixture was cooled to room temperature, and then the organic layer was separated from the mixture using diethyl ether (10 mL×3) and water. Magnesium sulfate was added to the separated organic layer, followed by stirring for 30 minutes. The mixture was filtered to remove volatiles from the mixture. The residue was added to a dry flask and dissolved in dichloromethane. After lowering the temperature to -78°C, boron tribrom...
Embodiment 3
[0108] After a stainless steel reactor with a volume of 500 mL was fully dried and purged with nitrogen, 300 mL of n-heptane was added thereto, followed by 0.5 mL of triisobutylaluminum (Aldrich) (200 mM solution in n-heptane). Subsequently, the temperature of the reactor was raised to 140° C., and then, 0.2 mL of (dichloro)(pentamethylcyclopentadienyl)(2-phenyl-4-fluorobenzene) prepared according to Example 1 was sequentially added. oxy)titanium(IV) (5 mM in toluene) and 0.3 mL of triphenylmethyltetrakis(pentafluorophenyl)borate (99%, Boulder Scientific) (5 mM in toluene). Ethylene was fed into the reactor until the pressure in the reactor was 30 atm, and the feeding was continued to carry out the polymerization reaction. 10 minutes after the start of the reaction, 10 mL of ethanol (containing 10% by volume of aqueous hydrochloric acid) was added to terminate the polymerization reaction. Then, another 1500 mL of ethanol was added to the product, stirred for 4 hours, and filt...
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