摘要:
Disclosed herein are novel fluoroolefins of formula Rf-O- (CF 2 CF 2 )n(CH 2 CF 2 )m-CH=CH 2 , wherein n is 1 or 2, m is 0 or 1 and Rf is a C 1 - C 8 fluoroalkyl or fluoroalkoxy group. The fluoroolefins may be oxidized to manufacture fluorinated carboxylic acids. Also disclosed are fluoropolymers comprising copolymerized units of the fluoroolefins of the invention and at least one other fluoromonomer.
摘要:
Embodiments in accordance with the present invention provide for forming essentially pure diastereomers of 5/6-substιtuted norbornene -type monomers Further, encompass polymerizing such diastereomers to form addition or ROMP polymers where a desired exo-/endo - ratio of the diastereomers is provided to the polymerization, such ratio designed to provide a desired ratio of endo-/exo- structured repeating units for a resulting polymer to have desired physical or chemical properties
摘要:
The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivaties of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I).
摘要:
Un procedimiento para la conversión de aldehidos que comprende poner en contacto un aldehido con agua oxigenada y con un catalizador, en condiciones de oxidación, caracterizado porque el catalizador es un tamiz molecular con poros de un diámetro de al menos 0,52 nm y tiene una fórmula empírica en forma calcinada y deshidratada de (Sn x Ti y Si 1-x-y-z Ge z )O 2 donde x es una fracción molar del estaño y tiene un valor entre 0,001 y 0,1; y es una fracción molar de titanio y tiene un valor de cero a 0,1; y z es la fracción molar del germanio y tiene un valor de cero a 0,08.
摘要翻译:本发明涉及一种醛转化方法,其包括在氧化条件下使醛与氧化水和催化剂接触。 本发明的方法的特征在于催化剂是包含直径至少为0.52nm的孔的分子筛和煅烧和脱水形式的(Sn x Ti y Si 1-xy-z Ge z)O 2的经验式,其中x是 锡的值在0.001和0.1之间,y是0.1的零值的钛的摩尔分数,z是在0.08的零值的锗的摩尔分数。
摘要:
Disclosed are manganese(IV) complex salts of formula [LMn(µ-O) 3 MnL)] n [XM 12 O 40 ] m , (I), wherein L is 1,4,7-trimethyl-1,4-7-triazacyclononane, X is P or Si, M is Mo or W, n is 2 or 3, and m is 1 or 2, with the provisos that (i) if X is Si, then n = 2 and m = 1 and (ii) if X is P, then n = 3 and m = 2. These compounds are active catalysts in the partial oxidation of various organic compounds with peroxy compounds, e. g. the preparation of ketones from secondary alcohols or the epoxidation of olefins.
摘要:
Halofluorinated alkylene monomers are made by a method comprising the steps of: (a) subjecting a first polymer which is the reaction product of a fluorinated vinyl monomer and a vinyl comonomer to dehydrohalogenation to form a second polymer; (b) treating the second polymer with an oxidizing agent to form an oxidation product consisting of a alpha , omega -dicarboxylic acid or an ester derivative thereof; and (c) treating said oxidation product with a reducing agent to form a reduction product consisting of a alpha , omega -diol. Preferably, the first polymer has a structure of -[CH2CYZ(CF2CFX)n]m- wherein X and Y = F, C1 or Br; X and Y may be the same or different; Z = H, F, C1, Br, alkyl or perfluoroalkyl containing from about 1 to about 10 carbon atoms; n = an integer larger than about 1; and m is an integer between about 2 and about 10 . The alpha , omega -dicarboxylic acids and alpha , omega -diols produced herein can be directly used as polycondensation monomers. Alternatively, the alpha , omega -dicarboxylic acids and alpha , omega -diols can be further derivitized to tri-, tetra- or other multifunctional alcohols which may be directly used as condensation monomers or they may be converted to acrylates which may be photocured in the presence of a radical photoinitiator into transparent polymers which are useful as optical waveguiding materials.
摘要翻译:通过包括以下步骤的方法制备卤代亚烷基单体:(a)使作为氟化乙烯基单体和乙烯基共聚单体的反应产物的第一聚合物进行脱卤化氢以形成第二聚合物; (b)用氧化剂处理第二聚合物以形成由α,ω-二羧酸或其酯衍生物组成的氧化产物; 和(c)用还原剂处理所述氧化产物以形成由α,ω-二醇组成的还原产物。 优选地,第一聚合物具有 - [CH 2 CYZ(CF 2 CFX)n] m - 其中X和Y = F,Cl或Br的结构; X和Y可以相同或不同; Z = H,F,C1,Br,含有约1至约10个碳原子的烷基或全氟烷基; n =大于1的整数; m为约2至约10 5之间的整数。 本文生产的α,ω-二羧酸和α,ω-二醇可以直接用作缩聚单体。 或者,可以将α,ω-二羧酸和α,ω-二醇进一步衍生为可以直接用作缩合单体的三元,四元或其它多官能醇,或者它们可以转化成丙烯酸酯,其可以在 将自由基光引发剂存在于用作光波导材料的透明聚合物中。
摘要:
In the manufacture of a substituted Beta zeolite, a high ethene pressure, is used advantageously accompanied by synthesis gel ageing and low aluminium content.