GASSMAN, P. G.;BURNS, S. J., J. ORG. CHEM., 53,(1988) N 23, C. 5576-5578
作者:GASSMAN, P. G.、BURNS, S. J.
DOI:——
日期:——
SOLID CATALYST FOR OLEFIN POLYMERIZATION AND PROCESS FOR PRODUCING OLEFIN POLYMER
申请人:Sumitomo Chemical Company, Limited
公开号:US20130072648A1
公开(公告)日:2013-03-21
A solid catalyst for olefin polymerization and a process for producing an olefin polymer are provided. The polymer has a small content of a component which is dissolved out into a low temperature organic solvent, such as a low-molecular weight component and an amorphous component. The solid catalyst is obtained by bringing a solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and an aliphatic carboxylate; an organoaluminum compound; and a compound represented by formula (I) into contact with each other:
wherein R
1
is a hydrocarbyl group having 1 to 10 carbon atoms, R
2
is a hydrogen atom, a halogen atom or a hydrocarbyl group having 1 to 16 carbon atoms, and the R
1
the R
2
groups are independently the same or different, and the respective R
1
groups and R
2
groups may be joined with each other to form a ring.
Nuclear magnetic resonance, force field, and MNDO studies on 1-methoxycycloalkenes
作者:Esko Taskinen
DOI:10.1016/s0040-4020(01)85647-7
日期:1994.1
expected planar s-cis conformation, the 4-membered ether exists predominantly in the exceptional s-trans conformation. The geometries of and charge densities in these ethers have been studied by forcefield (COSMIC, MM2) and MNDO calculations.
已经在CDCl 3溶液中记录了4至9元的1-甲氧基环烯烃的1 H,13 C和17 O NMR光谱。在17个ÔNMR化学位移揭示与环大小意外大的和不规则的变化。其他NMR位移数据表明,这些变化是由于有关OC(sp 2)键的平面和非平面构象异构体的相对数量不同所致。相同的NMR数据还表明,虽然5至9元醚的MeO基团主要采用预期的平面顺式构象,但4元醚主要存在于特殊的反式中构象。这些醚的几何形状和电荷密度已通过力场(COSMIC,MM2)和MNDO计算进行了研究。
Ring expansions via photoinduced single electron transfer promoted opening of cyclopropyl ethers