efficient and selective epoxidation of alkenes via the design of specialized ligands, which facilitates to control the activity and selectivity of the reactions catalyzed by iron atom. Herein, we report the development of the olefinepoxidation with inorganic-ligand supported iron-catalysts using 30% H2O2 as an oxidant, and the mechanism is similar to iron-porphyrin type. With the catalyst 1, (NH4)3[FeMo6O18(OH)6]
在过去的二十年中,在过渡铁催化的烯烃选择性氧化为环氧化物方面取得了重大进展。在药物,分离的天然产物和精细化学品中发现的常见结构。这些方法中的许多已通过专门配体的设计实现了烯烃的高效和选择性环氧化,这有助于控制铁原子催化的反应的活性和选择性。本文中,我们报道了使用30%H 2 O 2作为氧化剂的无机配体负载的铁催化剂进行烯烃环氧化的研究进展,其机理与铁卟啉类型相似。对于催化剂1,(NH 4)3 [FeMo 6O 18(OH)6 ],各种芳族和脂肪族烯烃均以优异的收率以及化学和立体选择性成功地转化为相应的环氧化物。该催化体系具有能够避免使用昂贵的,有毒的,对空气/湿气敏感的和商业上不可用的有机配体的优点。该方法的通用性易于操作,具有较高的催化活性和优异的稳定性,这使其有可能在工业规模上使用,并可能为通过无机配体配位的铁催化进行催化氧化反应开辟一条道路。。
Modified ethylene-vinyl alcohol copolymer and method for the production thereof
申请人:——
公开号:US20040096683A1
公开(公告)日:2004-05-20
Provided is a modified ethylene-vinyl alcohol copolymer (C) having an ethylen content of 5 to 55 mol %, which contains a specific structural unit (I) in an amount of 0.3 to 40 mol % and may be obtained by reacting an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) having a molecular weight of not more than 500. This can be produced by a method for producing the modified ethylene-vinyl alcohol copolymer (C) which comprises melting and kneading an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) in an extruder. The modified ethylene-vinyl alcohol copolymer (C) is superior to a unmodified ethylene-vinyl alcohol copolymer (A) in transparency, stretchability, flexibility and flexing resistance due to the specific structural unit (I) incorporated therein, and thus, can be used as a barrier material in various applications requiring the above performance capabilities.
Provided is a resin composition comprising 1-99% by weight of a modified ethylene-vinyl alcohol copolymer (C) having an ethylene content of 5-55 mol %, which contains a specific structural unit (I) in an amount of 0.3-40 mol % and can be obtained by reacting an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) having a molecular weight of not more than 500, and 1-99% by weight of a thermoplastic resin (T
1
) other than (C). Moreover, a multilayer structure in which the resin composition and a thermoplastic resin (T
2
) are laminated is also provided. Thus, a resin composition superior in barrier properties, transparency, stretchability, flexibility, flexing resistance and interlayer adhesiveness and various kinds of molded articles made thereof are provided.
MODIFIED ETHYLENE-VINYL ALCOHOL COPOLYMER AND METHOD FOR THE PRODUCTION THEREOF
申请人:IKEDA Kaoru
公开号:US20100280178A1
公开(公告)日:2010-11-04
Provided is a modified ethylene-vinyl alcohol copolymer (C) having an ethylen content of 5 to 55 mol %, which contains a specific structural unit (I) in an amount of 0.3 to 40 mol % and may be obtained by reacting an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) having a molecular weight of not more than 500. This can be produced by a method for producing the modified ethylene-vinyl alcohol copolymer (C) which comprises melting and kneading an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) in an extruder. The modified ethylene-vinyl alcohol copolymer (C) is superior to a unmodified ethylene-vinyl alcohol copolymer (A) in transparency, stretchability, flexibility and flexing resistance due to the specific structural unit (I) incorporated therein, and thus, can be used as a barrier material in various applications requiring the above performance capabilities.
MODIFIED ETHYLENE−VINYL ALCOHOL COPOLYMER AND METHOD FOR THE PRODUCTION THEREOF
申请人:Kuraray Co., Ltd.
公开号:EP1403289A1
公开(公告)日:2004-03-31
Provided is a modified ethylene-vinyl alcohol copolymer (C) having an ethylen content of 5 to 55 mol%, which contains a specific structural unit (I) in an amount of 0.3 to 40 mol% and may be obtained by reacting an ethylene-vinyl alcohol copolymer (A) with a monofunctional epoxy compound (B) having a molecular weight of not more than 500. This can be produced by a method for producing the modified ethylene-vinyl alcohol copolymer (C) which comprises melting and kneading an ethylene-vinyl alcohol copolymer (A) with amonofunctional epoxy compound (B) in an extruder. The modified ethylene-vinyl alcohol copolymer (C) is superior to a unmodified ethylene-vinyl alcohol copolymer (A) in transparency, stretchability, flexibility and flexing resistance due to the specific structural unit (I) incorporated therein, and thus, can be used as a barrier material in various applications requiring the above performance capabilities.