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Process for producing metallocenes

A kind of technology of metallocene, alkali metal alkoxide, be used in the intermediate field of synthesizing described metallocene

Pending Publication Date: 2021-09-07
LANXESS ORGANOMETALLICS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite progress to date, there is still room to improve the methods used to produce metallocene catalysts

Method used

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  • Process for producing metallocenes
  • Process for producing metallocenes
  • Process for producing metallocenes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091] Reaction Step (a) Synthesis of 2,2-bis-indenylpropane

[0092]All manipulations were performed under an inert gas atmosphere (argon). A 2 L volume double wall reactor was charged with DMSO (100 mL), NaOMe (0.9 g, 0.02 mol) and indene (40 g, 0.33 mol) and stirred at 20° C. for 30 minutes. The reactor was cooled to 10 °C. Then, acetone (9.7 g, 0.17 mol) was added over 15 minutes keeping the reactor temperature below 20°C (exothermic reaction). The reaction mixture was then stirred at 40 °C for 2 h and at room temperature overnight until the reaction was complete (6,6-dimethylfulvene <1% as judged by GC). 100 g of water was added at 10° C. and stirred for 30 minutes, then methyl tert-butyl ether (MTBE; 236 g) was added to the reaction mixture. The mixture was stirred for another 30 minutes at room temperature.

[0093] The two phases were separated, the aqueous phase was extracted again with MTBE, and the combined organic phases were washed with saturated aqueous NaCl...

example 2

[0102] Example 2 was performed the same as Example 1, except that the bridging benzophenone (O=CPh 2 ; 15.2g, 0.08mol) instead, and the amount of NaOMe was doubled. The product was dried in vacuo yielding 35.5 g (0.064 mol, 80.1% i.y) of fine orange to red crystals.

example 3

[0104] Example 3 was performed the same as Example 1, except that DMF (dimethylformamide) was used as the solvent as shown in Table 1. The product was dried in vacuo yielding 20.0 g (0.073 mol, 44.2%) of fine white crystals.

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Abstract

The present invention relates to an improved process for the preparation of metallocenes of the general formula (A) CR2L2MX2 as well as to intermediates useful in the synthesis of said metallocenes and the use of the metallocenes as catalysts in a polymerization of an olefin.

Description

technical field [0001] The present invention relates to a method for preparing general formula (A) CR 2 L 2 MX 2 Improved methods of metallocenes and relates to intermediates useful in the synthesis of said metallocenes and to the use of said metallocenes as catalysts in the polymerization of olefins. Background technique [0002] The polymerization of olefins such as ethylene and propylene for the manufacture of thermoplastics or norbornene-containing polymers generally uses transition metal compounds, especially metallocene compounds, as polymerization catalysts. Such polymerization catalysts have been variously modified and investigated over the past decades. [0003] For example, metallocene compounds comprising unsubstituted or alkyl-substituted indenyl or fluorenyl ligand systems are known (GB-A-934,281). [0004] Bridged and substituted bis-(1-indenyl) ligands are suitable as starting compounds in processes for the production of metallocene catalysts for olefin po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F17/00C07C2/86C08F4/6592C08F10/00
CPCC07C2/867C07C2602/08C07F17/00C08F4/65927C07C13/465C07F7/00
Inventor 西尔维娅·毛斯比昂卡·霍夫曼索斯藤·霍尔特里希特-罗斯曼
Owner LANXESS ORGANOMETALLICS GMBH
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