TRANSITION METAL COMPLEX,CATALYST FOR OLEFIN POLYMERIZATION, AND PROCESS FOR PRODUCING OLEFIN POLYMER WITH THE SAME
申请人:Sumitomo Chemical Company, Limited
公开号:EP1426379B1
公开(公告)日:2009-11-11
Enantiospecific synthesis of a planar chiral bidentate indenyl–alkoxide complex of zirconium using an axially chiral indene ligand
作者:Robert W. Baker、Brian J. Wallace
DOI:10.1039/a903740c
日期:——
The reaction of axially chiral (M)-1-(2â²-methyl-3â²-indenyl)- naphthalene-2-methanol 3 with Zr(NEt2)4 enantiospecifically provides the planar chiral complex (P)-bis(diethylamido)-[1-(2â²-methyl-1â²-indenyl)naphthalene-2-methoxo]- zirconium 7.
Asymmetric synthesis of axially chiral 1-(2′-methyl-3′-indenyl)naphthalenes via prototropic rearrangements of stable rotamers of 1-(2′-methyl-1′-indenyl)naphthalenes
作者:Robert W. Baker、Joost N.H. Reek、Brian J. Wallace
DOI:10.1016/s0040-4039(98)01369-0
日期:1998.9
ylate 2 with 2-methylindenyllithium affords the -ac rotamer of methyl (S)-1-(2′-methyl-1′-indenyl)naphthalene-2-carboxylate 6 in 63% ee. Heating -ac-6 at 80 °C leads to the formation of an 18:1 mixture of -ac:+sc-6 rotamers, with a barrier to atropisomerisation of ΔG‡353 = 28.4 kcal mol−1 (+sc to -ac). Prototropic rearrangements of the rotamers of 1-(2′-methyl-1′-indenyl)naphthalenes to 1-(2′-meth