ether or acetal radicals were generated directly from ethers or acetals by the action of dimethylzinc-air, and their subsequent conjugate addition reaction with alkylidenemalonates afforded the corresponding conjugate adducts in reasonably high yields. The reaction with benzylidenemalonates bearing formyl and imino groups gave chemoselectively the conjugate addition products. The asymmetric reaction of
Probing Persistent Intramolecular C−H···X (X = O, S, Br, Cl, and F) Bonding in Solution Using Benzyl Meldrum’s Acid Derivatives
作者:Eric Fillion、Ashraf Wilsily、Dan Fishlock
DOI:10.1021/jo802311w
日期:2009.2.6
Persistent intramolecular interactions between acidic C−H hydrogens and a variety of acceptors (X) (X = O, S, Br, Cl, and F) in solution were probed by 1H NMR experiments, using 5-benzyl Meldrum’s acid derivatives. To bring about formation of intramolecular C−H···X bonding, ortho-substituted benzyl Meldrum’s acids were designed, for which hydrogenbonding occurred through a six-membered ring. Introduction
酸性CHH氢与溶液中各种受体(X)(X = O,S,Br,Cl和F)之间的持久分子内相互作用通过1 H NMR实验使用5-苄基Meldrum的酸衍生物进行探测。为了形成分子内CH键·X键,设计了邻位取代的苄基麦德鲁姆酸,通过六元环进行氢键键合。在芳族部分上和在系链中引入取代基允许电子和空间因素的变化。麦德鲁姆酸的优越酸度影响了CH氢参与非经典CH-··X键的能力,并结合了空间位阻因子A 1,3,推动了苄基麦德鲁姆酸的构象性质。-烯丙基菌株。通过表征固态的苄基麦德鲁姆酸,通过X射线分析以及与溶液中观察到的相关构象,可以进一步了解分子内C-H···X键。
Iridium-Catalyzed Branch-Selective Hydroalkylation of Simple Alkenes with Malonic Amides and Malonic Esters
malonic amides and malonic esters under neutral reaction conditions. A variety of aliphatic alkenes and aromatic alkenes bearing bromine, chlorine, ester, 2-thienylcarboxylate, silyl, and phthalimide groups were all found to be suitable for this hydroalkylation. The combination of this method with Krapcho dealkoxycarbonylation realized a one-potsynthesis of β-substituted amide and ester from β-amide
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.