mutually trans positions. Upon activation with methylaluminoxane (MAO), all nickel complexes were able to oligomerize ethylene with turnover frequencies (TOFs) varying from 5.0 to 16.6 × 103 (mol ethylene) (mol Ni)−1 h−1 producing selectively 1‐butene (91.0–95.5 wt%). The substitution on the pyrazolyl group and the length of the backbone chain play a significant role in the catalytic activity. The use of
A nitrile compound shown by the formula (1) has an excellent pesticidal activity and it is useful as an active ingredient of pesticide.
化学式(1)所示的腈类化合物具有出色的杀虫活性,并且作为杀虫剂的活性成分非常有用。
US7541374B2
申请人:——
公开号:US7541374B2
公开(公告)日:2009-06-02
Chromium and nickel catalysts for oligomerization recations and process for obtaining alpha-olefins using said catalysts
申请人:de Lazaro Casagrande Junior Osvaldo
公开号:US20120178939A1
公开(公告)日:2012-07-12
The present invention refers to the synthesis of precatalysts and the use of such precatalysts in ethylene oligomerization reactions for the selective production of alpha-olefins. More specifically, it refers to the preparation and use of coordination compounds containing polydentate ligands comprising Group 6 and 10 transition metal compounds, in particular chromium (III) and nickel (II). Such catalytic precursors present high catalytic activity and selectivity for the production of alpha-olefins.