Zirconium complexes with pendant aryloxy groups attached to the metallocene moiety by ethyl or hexyl spacers
摘要:
Four zirconium complexes with pendant aryloxy groups attached to the metallocene moiety by ethyl or hexyl spacers have been synthesized and characterized by spectroscopic methods and HR-MS or elemental analysis. The solid state structure of bis[{6-(2,6-dimethylphenoxy)hexyl}cyclopentadienyl]zirconium dichloride was determined by single crystal X-ray diffraction. The prepared complexes were tested as catalyst precursors in the polymerization of ethylene upon activation with MAO. The results showed a marked effect of the spacer length on the catalytic activity, while only a minor effect of the substitution on the aryl group, which affected its steric properties. (C) 2013 Elsevier Ltd. All rights reserved.
Zirconium complexes with pendant aryloxy groups attached to the metallocene moiety by ethyl or hexyl spacers
摘要:
Four zirconium complexes with pendant aryloxy groups attached to the metallocene moiety by ethyl or hexyl spacers have been synthesized and characterized by spectroscopic methods and HR-MS or elemental analysis. The solid state structure of bis[{6-(2,6-dimethylphenoxy)hexyl}cyclopentadienyl]zirconium dichloride was determined by single crystal X-ray diffraction. The prepared complexes were tested as catalyst precursors in the polymerization of ethylene upon activation with MAO. The results showed a marked effect of the spacer length on the catalytic activity, while only a minor effect of the substitution on the aryl group, which affected its steric properties. (C) 2013 Elsevier Ltd. All rights reserved.
Nickel-Catalyzed Cyanation of Unactivated Alkyl Sulfonates with Zn(CN)<sub>2</sub>
作者:Aiyou Xia、Peizhuo Lv、Xin Xie、Yuanhong Liu
DOI:10.1021/acs.orglett.0c02722
日期:2020.10.16
Cyanation of unactivated primary and secondaryalkyl mesylates with Zn(CN)2 catalyzed by nickel has been developed. The reaction provides an efficient route for the synthesis of alkyl nitriles with wide substrate scope, good functional group tolerance, and compatibility with heterocyclic compounds. Mechanistic studies indicate that alkyliodide generated in situ serves as the reactive intermediate