Influences of Ligand Backbone Substituents on Phosphinecarbonylpalladium and -nickel Catalysts for Ethylene Polymerization and Copolymerization with Polar Monomers
作者:Ningning Zhu、Tao Liang、Yongshuang Huang、Wenmin Pang、Min Chen、Chen Tan
DOI:10.1021/acs.inorgchem.1c01490
日期:2021.9.6
used in ethylenepolymerization and copolymerization with polar monomers. The Pd and Ni catalysts can achieve high activities as well as highpolymermolecularweights in both ethylenepolymerization and copolymerization with polar monomers. The electron-donating group from the carbonyl side can effectively increase the polymermolecularweights. Utilization of a cyclic backbone structure can increase
The present invention describes immobilized haloenamine reagents, immobilized tertiary amides, methods for their preparation, and methods of use.
本发明描述了固定化的卤胺试剂、固定化的三级酰胺、其制备方法以及使用方法。
Aromatic and heteroaromatic acid halides for synthesizing polyamides
申请人:Pharmacia Corporation
公开号:US20030105279A1
公开(公告)日:2003-06-05
The present invention is directed to protected amino acid halide monomers and oligomers, and to their use in the efficient sythesis of polyamides. The present invention is further directed to the use of &agr;-haloenamine reagents, which may optionally be immobilized, for the preparation of the amino acid halides.
Synthesis of Substituted 2-Pyridones via the Pummerer Cyclization−Deprotonation−Cycloaddition Cascade of Imidosulfoxides
作者:Albert Padwa、Todd M. Heidelbaugh、Jeffrey T. Kuethe
DOI:10.1021/jo982315r
日期:1999.3.1
p-toluenesulfonic acid results in ring opening to give 5-acetoxy-substituted 2-pyridones. The lone pair of electrons on the amide nitrogen assists in opening the oxy bridge to generate a transient N-acyliminium ion, which subsequently loses a proton. In certain cases, the amide electron pair with the oxy bridge is partially twisted from an antiperiplanar arrangement and a competive ring cleavage also occurs to
technique that generates a wide variety of amides without the requirement of acid–amine coupling or other intermediate steps. However, transamidation of unactivated aliphaticamides, on the other hand, has been a long-standing issue in comparison to transamidation of activated amides. Herein, we report a transamidation approach of an unactivated aliphatic amide using a copper catalyst and chlorotrimethylsilane