Fulvene, metallocene catalysts and preparation method thereof, and preparation of polyolefines copolymer using the same
申请人:Park Young-Whan
公开号:US20050004385A1
公开(公告)日:2005-01-06
The present invention relates to a novel fulvene compound and a preparation method thereof, and more particularly to a fulvene compound having substituted groups in the 2- and 5-positions, prepared from an unsaturated ketone having a substituted group in the β-position and a halogen atom in the α-position, and a preparation method thereof. The present invention also relates to a metallocene catalyst having a substituted group in the α-position carbon of the bridge of the cyclopentadienyl group only by reaction of a fulvene compound and an anion group including the cyclopentadienyl group, and a preparation method of a polyolefin copolymer using the same.
Halogenation of Carbonyl Compounds by an Ionic Liquid, [AcMIm]X, and Ceric Ammonium Nitrate (CAN)
作者:Brindaban C. Ranu、Laksmikanta Adak、Subhash Banerjee
DOI:10.1071/ch07061
日期:——
An ionic liquid, acetylmethylimidazolium halide ([AcMIm]X), in combination with ceric ammoniumnitrate promotes halogenations of a wide variety of ketones and 1,3-keto esters at the α-position. The ionic liquid acts here as reagent as well as reaction medium, and thus the reaction does not require any organic solvent or conventional halogenating agent. The reaction is completely arrested when the radical
离子液体乙酰甲基咪唑鎓卤化物 ([AcMIm]X) 与硝酸铈铵结合可促进多种酮和 1,3-酮酯在 α 位的卤化。离子液体在此既充当试剂又充当反应介质,因此该反应不需要任何有机溶剂或常规卤化剂。当使用自由基猝灭剂 TEMPO 时,反应完全停止。还提出了一种似是而非的激进机制。
A Convenient and Useful Method of Preparation of<i>α</i>-Bromo Enones from the Corresponding Enones Using Organic Ammonium Tribromide (OATB)
作者:Gopal Bose、Pankaj M. Bujar Barua、Mihir K. Chaudhuri、Dipak Kalita、Abu T. Khan
DOI:10.1246/cl.2001.290
日期:2001.4
Various acyclic α-bromo enones 2 as well as cyclic α-bromo enones 4 can be prepared from the corresponding acyclic enones 1 and cyclic enones 3 respectively, in a one-pot procedure by employing organic ammonium tribromide, such as cetyltrimethylammonium tribromide (CetTMATB) or tetrabutylammonium tribromide (TBATB) in presence of K2CO3 in dichloromethane at 0 °C to room temperature under very mild
[EN] 4-SUBSTITUTED IMIDAZOLE-2-THIONES AND IMIDAZOL-2-ONES AS AGONISTS OF THE ALPHA-2B AND ALPHA-2C ADRENERGIC RECEPTORS<br/>[FR] IMIDAZOLE-2-ONES ET IMIDAZOLE-2-THIONES 4 SUBSTITUES COMME AGONISTES DES ADRENO-RECEPTEURS ALPHA-2B ET ALPHA-2C
申请人:ALLERGAN INC
公开号:WO2003099795A1
公开(公告)日:2003-12-04
Compounds of Formula (I): where X is S and the variables have the meaning defined in the specification are specific or selective to alpha2B and/or alpha2C adrenergic receptors in preference over alpha2A adrenergic receptors, and as such have no or only minimal cardivascular and/or sedatory activity. These compounds of Formula (I) are useful as medicaments in mammals, including humans, for treatment of diseases and or alleviations of conditions which are responsive to treatment by agonists of alpha2B adrenergic receptors. Compounds of Formula (I) where X is O also have the advantageous property that they have no or only minimal cardivascular and/or sedatory activity and are useful for treating pain and other conditions with no or only minimal cardivascular and/or sedatory activity.