of radical species with alkenes/alkynes, the ortho-/ipso-selectivity of the cyclic reaction between radical species (especially alkyl and alkenyl radical) and aryl groups is still ambiguous. Herein, we develop an electrochemically enabled regioselective ortho-(4 + 2)/ipso-(3 + 2) cyclization of alkyl/alkenyl radicals with aryl groups, which provides a series of tetrahydronaphthalene and spirocarbocycle
METHOD FOR PRODUCING SOLID CATALYST COMPONENT FOR USE IN POLYMERIZATION OF OLEFIN, CATALYST FOR USE IN POLYMERIZATION OF OLEFIN, AND METHOD FOR PRODUCING OLEFIN POLYMER
申请人:Toho Titanium CO., LTD.
公开号:EP2876118A1
公开(公告)日:2015-05-27
A method for producing a solid catalyst component for olefin polymerization produces a novel solid catalyst component for olefin polymerization that achieves excellent olefin polymerization activity and activity with respect to hydrogen during polymerization, and can produce an olefin polymer that exhibits a high MFR, high stereoregularity, and excellent rigidity. The method includes a first step that brings a magnesium compound, a tetravalent titanium halide compound, and one or more first internal electron donor compounds selected from specific aromatic dicarboxylic diesters into contact with each other to effect a reaction, followed by washing, a second step that brings a tetravalent titanium halide compound and one or more second internal electron donor compounds into contact with a product obtained by the first step to effect a reaction, followed by washing, and a third step that brings one or more third internal electron donor compounds into contact with a product obtained by the second step to effect a reaction.
PRODUCTION METHOD FOR SOLID CATALYST COMPONENT FOR POLYMERIZING OLEFINS, CATALYST FOR POLYMERIZING OLEFINS, AND PRODUCTION METHOD FOR POLYMERIZED OLEFINS
申请人:TOHO TITANIUM CO., LTD.
公开号:EP2963063A1
公开(公告)日:2016-01-06
A method for producing a solid catalyst component for olefin polymerization produces a novel solid catalyst component for olefin polymerization that achieves excellent olefin polymerization activity and activity with respect to hydrogen during polymerization, and can produce an olefin polymer that exhibits a high MFR, high stereoregularity, and excellent rigidity. The method includes a first step that brings a magnesium compound, a tetravalent titanium halide compound, and one or more first internal electron donor compounds excluding an aromatic dicarboxylic acid diester into contact with each other to effect a reaction, followed by washing; a second step that brings a tetravalent titanium halide compound and one or more second internal electron donor compounds into contact with a product obtained by the first step to effect a reaction, followed by washing; and a third step that brings one or more third internal electron donor compounds into contact with a product obtained by the second step to effect a reaction.
The present invention relates to novel Norrish Type II photoinitiators which may be liquid or easily solubilized at room temperature. The invention also relates to compositions comprising these photoinitiators as well as their use for photopolymerizing ethylenically unsaturated compounds or solubilizing other photoinitiators.
本发明涉及新型 Norrish II 型光引发剂,其可在室温下呈液态或易于溶解。本发明还涉及包含这些光引发剂的组合物,以及它们在乙烯不饱和化合物光聚合或溶解其他光引发剂中的用途。