Fluxional catalysts and related ligands containing bulky substituents
申请人:BP Corporation North America Inc.
公开号:US06479424B1
公开(公告)日:2002-11-12
A ligand useful to form a metallocene olefin polymerization catalyst comprises:
wherein at least R3 and R4 are substituents having at least a bulk of a t-butyl group and, optionally, wherein R1 or R2 may be a bulky substituent group.
Asymmetric addition of an <i>N</i>-methyl C(sp<sup>3</sup>)–H bond to cyclic alkenes enabled by an iridium/phosphine–olefin catalyst
作者:Kana Sakamoto、Takahiro Nishimura
DOI:10.1039/d2cc04642c
日期:——
asymmetric C–H addition of an N-methyl group on 3-trifluoromethyl-2-(N-methylamino)pyridine to cyclic alkenes was realized by using a phosphine–olefin ligand. Indene and its 7-substitutedderivatives, acenaphthylene, and some bicyclic alkenes underwent the addition to give the corresponding products in good yields with high enantioselectivity.