BIS-PHENYL-PHENOXY POLYOLEFIN CATALYSTS HAVING A METHYLENETRIALKYLSILICON LIGAND ON THE METAL FOR IMPROVED SOLUBILITY
申请人:Dow Global Technologies LLC
公开号:US20200270282A1
公开(公告)日:2020-08-27
Embodiments are directed to a catalyst system comprising metal-ligand complexes and processes for polyolefin polymerization using the metal-ligand complex having the following structure, Formula (I), where X is selected from the group consisting of —(CH2)SiRX3.
Synthesis and thermal stability of silicon-containing esters of phosphorus acids
作者:L. S. Zakharov、G. N. Molchanova、T. M. Shcherbina、P. V. Petrovskii、M. I. Kabachnik
DOI:10.1007/bf02495692
日期:1998.9
(b), CF3CH2CH2 (c, e), Me3SiCH2 (d); R′=Me (a-d), Et (e)) were synthesized and their thermalrearrangement, of the 1,2-shift type, was studied. The rearrangement consists of the migration of an alkyl group from Si atom to the methylene carbon atom and gives the corresponding silyl esters. The rate of the rearrangement was found to increase in the order1d<1b<1a<1 (R=R′=Me)<1c corresponding to the enhancement
Heteroatom-Facilitated Lithiations of N-Methyl-N-(trimethylsilyl)methyl- benzylamine and Benzyl (Trimethylsilyl)methyl Ether with Butyllithium.
作者:Seiko MITSUI、Kiyotaka MARUMO、Sumie ANDO-INOUE、Hideo KATO、Yosiro SATO
DOI:10.1248/cpb.41.2195
日期:——
Lithiation of the Si-methyl groups of N-methyl-N-[(trimethylsilyl)methyl]benzylamine (1) occurred in preference to ortho-lithiation of the benzyl group with butyllithium in ether. In a similar reaction with benzyl (trimethylsilyl)methyl ether (7), lithiation of the benzylic position competed with that of the Si-methyl groups.
Polar Order and Symmetry Breaking at the Boundary between Bent-Core and Rodlike Molecular Forms: When 4-Cyanoresorcinol Meets the Carbosilane End Group
Two isomeric achiral bent‐coreliquid crystals involving a 4‐cyanoresorcinol core and containing a carbosilane unit as nanosegregating segment were synthesized and were shown to form ferroelectric liquid‐crystalline phases. Inversion of the direction of one of the COO groups in these molecules leads to a distinct distribution of the electrostatic potential along the surface of the molecule and to a
合成了两个包含4-氰基间苯二酚核并包含碳硅烷单元作为纳米分离链段的非手性非手性弯曲核液晶,并显示形成铁电液晶相。这些分子中一个COO基团的方向反转会导致静电势沿分子表面的明显分布,并导致分子偶极矩的强烈变化。因此,产生了碳硅烷单元的明显的偏析程度,并因此改变了相结构和极性顺序的相干长度。对于具有更大偶极矩的化合物(CN1)碳硅烷单元的偏析得到抑制,该化合物形成顺电SmA和SmC相;极性顺序只有在过渡到新的LC相(即具有倾斜方向和极性方向一致的独特特征的铁电倾斜相(SmCL s P S))后才能实现。偶极矩较小的异构体化合物CN2形成碳硅烷基团的独立层,并显示出随机的极性SmA相(SmAP AR)和铁电多畴SmC s P S具有倾斜和极性方向的正交组合的相位以及更高得多的极化。因此,令人惊讶的是,具有较小分子偶极矩的化合物在LC相中显示出增加的极性顺序。除了铁电,在CN1的一个SmC相中还观