JP-7854828-B2 - new compound

Inventors

• 柴田 要
• 山田 航
• 寺尾 浩志

Assignees

• 三井化学株式会社

Dates

Publication Date

20260507

Application Date

20220325

Priority Date

20210331

Claims (3)

1. A compound represented by the following general formula (A-1). [In formula (A-1), R1 is a group 16 atom in the periodic table. R 2 is a substituent in the -(Q(R l ) 2 ) x - structure, where Q is a carbon atom or a silicon atom. R3 and R4 are substituents in the -C( Rm ) 2- structure, and in the formula, the multiple Rm atoms may bond with each other to form a ring structure, or they may directly bond to form a covalent bond to form a ring structure. R5 to R7 , R1 , and Rm are, respectively, a hydrogen atom, a halogen atom, a hydrocarbon group, a halogen-containing group, a silicon-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a phosphorus-containing group, a boron-containing group, an aluminum-containing group, or a diene-based divalent derivative group. n is an integer between 2 and 10. x is an integer between 0 and 5 (excluding 0) .
2. The compound according to claim 1, wherein n is 4 or 5.
3. The compound according to claim 1, wherein the ring structure formed by R3 and R4 is an aromatic ring.

Description

This invention relates to novel compounds, and more specifically, to novel compounds that can be used as ligands for novel transition metal compounds that can be used as catalysts for olefin polymerization. Catalysts consisting of metallocene compounds and co-catalysts such as organoaluminum oxy compounds are known for producing olefin polymers such as ethylene-α-olefin copolymers and propylene polymers. Various types of transition metal compounds, such as metallocene compounds, have been actively developed as catalysts. For example, Patent Document 1 describes a transition metal compound (A) represented by the following general formula: A method for producing a cyclic olefin copolymer is described, in the presence of a polymerization catalyst comprising one or more activators (B) selected from organoaluminum oxy compounds and organoboron compounds, wherein the copolymerization is carried out by copolymerizing ethylene and/or α- olefins having 3 to 20 carbon atoms with at least one cyclic olefin compound. Specific examples of the transition metal compound (A) include CpTi(t- Bu₂C =N) Cl₂ , and a comparative example is Cp * Ti(2,6 - iPr₂PhO ) Cl₂ (wherein Cp represents a cyclopentadienyl group, and Cp * represents η₅). (This represents the pentamethylcyclopentadienyl group.) On the other hand, Patent Document 2 discloses an example of producing ultra-high molecular weight polyethylene using a complex having a Cp * [t-BuPN] Cl2 skeleton. Furthermore, there are disclosures of using metallocene compounds having cyclopentadienyl and fluorenyl structures of specific structures as components of catalysts for olefin polymerization (Patent Documents 3 and 4). Japanese Patent Publication No. 2007-63409Special table 2016-534165 publicationInternational Publication No. 01/027124International Publication No. 2004/029062 The compounds of the present invention are represented by the following general formula (A-1) and are identified by satisfying the following requirements. In formula (A-1), R1 is a group 16 atom of the periodic table. Specifically, examples include oxygen (O-), sulfur (S-), selenium (Se-), tellurium (Te-), etc. More preferably, it is selected from oxygen and sulfur atoms, and even more preferably oxygen. R2 is a substituent in the -(Q( Rl ) 2 ) x- structure, where Q is a carbon atom or a silicon atom. Q is preferably a carbon atom. Here, x is an integer from 0 to 5. The preferred upper limit of x is 4, more preferably 3, and even more preferably 2. When x is 0, specifically, the fluorenyl structure of formula (A-1) and the ring structure formed by R3 and R4 are directly bonded by covalent bonds. When R2 is a substituent in the -(C( Rl ) 2 ) x- structure, multiple Rl groups may bond to each other to form a ring structure, or Rl groups bonded to adjacent carbon atoms may directly bond to each other to form a carbon-carbon double bond (-C=C-). Specific examples of Rl groups will be described later. The structure of R2 allows for control of the conformation, such as the distance and angle between the aromatic ring structure and the fluorenyl structure of formula (A-1). By controlling this conformation, as described later, olefin polymerization catalysts containing a transition metal complex with the compound of the present invention as a ligand may be able to control the stereoregularity of the resulting olefin polymer in polymerization reactions of propylene and other materials. R3 and R4 are substituents in the -C( Rm ) 2- structure. In the formula, the multiple Rm atoms may bond with each other to form a ring structure, or they may directly bond to form a covalent bond to form a ring structure. A preferred example of the direct bonding configuration is a structure in which Rm atoms bonded to adjacent carbon atoms directly bond to each other to form a carbon-carbon double bond (-C=C-). n is an integer between 2 and 10. When n is 2 or greater, the multiple bases represented by R4 may be the same or different from one another. A preferred lower limit for n is 2, more preferably 4. On the other hand, a preferred upper limit is 8, more preferably 6, and even more preferably 5. The ring structure formed by R3 and R4 is bonded to the aromatic ring structure and to R2 or the fluorenyl structure of formula (A-1). It is preferable that these two groups are bonded to different R3s or to groups selected from among multiple R4s . For example, R3 and R2 are bonded, and R4 is bonded to the aromatic ring structure. An example of a structure in which a different R4 than the one bonded to the aromatic ring structure is bonded to R2 can be given. R3 and R4 form a ring structure as shown in formula (A-1). This ring structure links the aromatic ring structure and the fluorenyl structure of (A-1), and by creating a rigid ring structure, as will be described later, when the compound of the present invention is used as a catalyst for olefin polymerization, it may exhibit favorable effects in stereocontrolling the reaction and co