A Flexible Asymmetric Synthesis of 1,2-anti tert-Butylsulfanyl Amines
作者:Dieter Enders、Annette Schaadt
DOI:10.1055/s-2002-20477
日期:——
A flexible diastereo- and enantioselective synthesis of various 1,2-anti tert-butylsulfanyl amines 5a-e is described. As starting material SAMP-hydrazone (S)-2 was obtained from 2-(bromomethyl)-1,3-dioxolane (1) in a three-step procedure. α-Alkylation with various electrophiles, followed by 1,2-addition to the C-N double bond and removal of the auxiliary by cleavage of the N-N-bond results in the title
描述了各种 1,2-抗叔丁基硫烷基胺 5a-e 的灵活非对映选择性和对映选择性合成。作为原料,SAMP-腙(S)-2是在三步程序中从2-(溴甲基)-1,3-二氧戊环(1)获得的。用各种亲电子试剂进行α-烷基化,然后将 1,2-加成到 CN 双键并通过裂解 NN 键去除助剂,导致标题化合物具有极好的非对映体和对映体过量(de, ee ≥ 96%) .
Catalysts for olefin polymerization
申请人:Brookhart Maurice
公开号:US20050245702A1
公开(公告)日:2005-11-03
Late transition metal complexes of certain ligands which contain phosphinidine and/or imine groups are useful as components of polymerization catalysts for olefins. Useful metals in the complexes include Ni, Pd, Fe and Co. Oligomers and/or polymers of olefins such as ethylene can be made.
Phosphinidine-Palladium Complexes for the Polymerization and Oligomerization of Ethylene
作者:Olafs Daugulis、Maurice Brookhart、Peter S. White
DOI:10.1021/om020631x
日期:2002.12.1
Several cationic palladium complexes containing bulky phosphinidine-imine, phosphinidine-sulfide, and imine-sulfide ligands have been prepared. These complexes catalyze the oligomerization and polymerization of ethylene with moderate to high rates (for palladium catalysts) and display higher stability compared to diimine-palladium systems.
Phosphonocysteine and Phosphonohomocysteine; Synthesis and Isolation