Methods For Oligomerizing Olefins With Chromium Pyridine Mono-Oxazoline Catalysts
申请人:Ackerman Lily J.
公开号:US20080182989A1
公开(公告)日:2008-07-31
The present invention provides a method of producing oligomers of olefins, comprising reacting olefins with a chromium based catalyst under oligomerization conditions. The catalyst can be the product of the combination of a chromium compound and a pyridyl mono-oxazoline compound. In particular embodiments, the catalyst compound can be used to trimerize or tetramerize ethylene to
1
-hexene,
1
-octene, or mixtures of
1
-hexene and
1
-octene.
Palladium-Catalyzed Intermolecular Asymmetric Dearomative Annulation of Phenols with Vinyl Cyclopropanes
作者:Wen-Dao Chu、Tian-Tian Liang、Hao Ni、Zhi-Hong Dong、Zhihui Shao、Yong Liu、Cheng-Yu He、Ruopeng Bai、Quan-Zhong Liu
DOI:10.1021/acs.orglett.2c01594
日期:2022.7.15
Herein, we report the Pd(0)-catalyzed intermolecularasymmetric dearomative [3 + 2] annulation of phenols with vinyl cyclopropanes via in situ generated ortho-quinone methide intermediates. A series of highly functionalized spiro-[5,6] bicycles which bear three contiguous stereogenic centers including one all-carbon quaternary were obtained with excellent stereoselectivities. Density functional theory
The factors affecting the palladium-catalyzed synthesis of chiral α-chloromethylene-γ-butyrolactone were investigated. The combined effect of ligand, additive and N-Chlorophthalimide (NCP) is an important factor for the yield and ee value of this reaction. The method has good generalizability.