is treated with zirconocene equivalent ‘Cp2Zr’ to generate thermostable 1-fluorovinylzirconocene via a CFbondcleavage. This 1-fluorovinylzirconocene can be used for CCbond formation through the cross-coupling with aryl iodides in the presence of palladium catalyst and zinc iodide, leading to (Z)-1-aryl-2-(p-dimethylaminophenoxy)-1-fluoroolefins in good yields.
Novel silacyclohexane compounds, preparation thereof, liquid crystal compositions comprising the same, and liquid crystal devices comprising the composition
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:EP0742222A2
公开(公告)日:1996-11-13
A compound of formula (I)
wherein R is an organic residue.
is an unsubstituted or substituted silicon-containing cyclohexylene group or a 1,4-cyclohexylene group,
is an unsubstituted or substituted phenylene, an unsubstituted or substituted silicon-containing cyclohexylene group or trans-4-sila-1,4-cyclohexylene group, or a 1,4-cyclohexylene group provided that at least one of the ring structures A and B represents a silicon-containing cyclohexylene group, m, n, j, k and l are each H or F, m and n are each 0 or 1, X1 and Y are each H, F or Cl, and X2 is F or Cl, a liquid crystal composition comprising the compound and a liquid crystal device comprising the composition are described.
式 (I) 的化合物
其中 R 是有机残基
是未取代或取代的含硅环己烷基团或 1,4-环己烷基团、
是未取代或取代的苯基、未取代或取代的含硅环己烷基团或反式-4-硅杂-1,4-环己烯基团或 1,4-环己烯基团,条件是环结构 A 和 B 中至少有一个代表含硅环己烷基团、m、n、j、k 和 l 各为 H 或 F,m 和 n 各为 0 或 1,X1 和 Y 各为 H、F 或 Cl,X2 为 F 或 Cl,描述了包含该化合物的液晶组合物和包含该组合物的液晶装置。
DE, COCK, CH.;PIETTRE, S.;LAHOUSSE, F.;JANOUSEK, Z.;MERENYI, R.;VIEHE, H.+, TETRAHEDRON, 1985, 41, N 19, 4183-4193
A production method of producing a fluorine-containing olefin by allowing a first olefin represented by the following Formula (1) and a second olefin to react with each other in the presence of a ruthenium compound represented by the following Formula (X) is provided.
Highly Active Cross-Metathesis of Tetrafluoroethylene with a Seven-Membered N-Heterocyclic-Carbene–Ruthenium Catalyst
A drastic increase in catalyst turnover number (TON) was accomplished in the cross-metathesis of tetrafluoroethylene (TFE) and vinyl ethers. Under a continuous flow of TFE, catalyst Ru7, which contains a seven-membered N-heterocyclic carbene (NHC) ligand, reached a TON of 4100; this is 2 orders of magnitude higher than the highest hitherto reported value. Mechanistic studies revealed that the expanded