Large-steric-hindrance alpha-diimine ligand, nickel catalyst and preparation method and application thereof
A diimine ligand, large steric hindrance technology, applied in the preparation of imino compounds, organic chemistry, etc., can solve the problems of low molecular weight, high temperature and high pressure, harsh conditions and other problems of copolymers
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0074] Step 1, the preparation of 4-methyl-2,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane) aniline
[0075]
[0076] Under a nitrogen atmosphere, 2,6-dibromo-4-methylaniline (0.50g, 1.9mmol), bis(pinacol)diborane (1.44g, 5.7mmol), potassium acetate (0.55g, 5.6 mmol) and [1,1′-bis(diphenylphosphino)ferrocene]palladium dichloride (0.028 g) were dissolved in dimethyl sulfoxide (20 mL), then stirred at 80° C. for 24 h. After the reaction was completed, the black-red liquid mixture was poured into ice water (50 mL) and the precipitate was filtered. The precipitate was redissolved in dichloromethane, the organic layer was washed with water, separated and dried over sodium sulfate. After filtration, the organic phase was concentrated by rotary evaporation. By flash column chromatography (silica gel; PE / CH 2 Cl 2 = 3:1) to purify the resulting residue and then use CH 2 Cl 2 / CH 3 Recrystallization from OH afforded 0.40 g (60% yield) of the product as yellow-white crystals. ...
Embodiment 2-21
[0088] Step 1-Step 4 are the same as in Example 1, except for the variables in Tables 1-3, other conditions are unchanged. In the table, the substitute for 4-methyl-2,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane)aniline of Example 1 is designated A , the substitute for 4-trityl iodobenzene is denoted as B, the substitute for 4-methyl-2,6-bis[(4-trityl)phenyl]aniline is denoted as C, 2,3- The substitute of butanedione is recorded as D, the substitute of bis-[2,6-bis(4-trityl)phenyl-4-methylphenyl)butanedione-1,2-diimine Denoted as E, [(MeN^N)NiBr 2 The substitute is designated as F.
[0089] Table 1 Example 2-22 Step 2 Synthesis C reactant (reaction temperature: 90°C, reaction time: 24h)
[0090]
[0091]
[0092]
[0093]
[0094]
[0095]
[0096] Table 3 Example 2-22 Step 4 Synthesis of F reactants (reaction time: 24h, 25°C)
[0097]
[0098]
[0099]
[0100]
Embodiment 23-44
[0102] A 350 mL glass pressure reactor connected to a high pressure gas line was first vacuum dried at 90 °C for at least 1 h. Then adjust the reactor to 30°C, add 98 mL of toluene and 500 μmol of MMAO into the reactor under an inert atmosphere, and then dissolve 1 μmol of Ni catalyst in 2 mL of dichloromethane (or chloroform) and inject it into the polymerization system through a syringe middle. Under rapid stirring (over 750 rpm), ethylene was introduced and kept at 8 atm. After 10 minutes, the pressure reactor was emptied, and a large amount of ethanol (or methanol) solution with a concentration of 5 wt% hydrochloric acid was added to quench the polymerization reaction, filtered, and dried in a vacuum oven to constant weight.
[0103] Wherein, the structural general formula of nickel catalyst is shown in formula (II), R 2 =CH 3 , R 3 = R 4 = R 5 = Ph, R 1 , R 8 , R 9 See Table 4.
[0104] (R 1 , R 8 , R 9 ) The performance of the polyethylene obtained by cataly...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com