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双羰化
相关语句
  double carbonylation
     Cobalt complexes catalyzed double carbonylation of benzyl chloride for synthesis phenylpyruvic acid
     钴络合物催化双羰化氯苄合成苯丙酮酸
短句来源
     Double Carbonylation of Benzyl Chloride to Substituted Phenylpyruvic Acid Catalyzed by Cobalt Pyridine-2-carboxylate
     吡啶-2-羧酸钴催化氯苄双羰化合成新型α-酮酸研究
短句来源
     STUDIES ON PALLADIUM (Ⅱ) COMPLEXES CATALYZED DOUBLE CARBONYLATION OF ARYL HALIDES AFFORDING α-KETOAMIDE
     钯络合物催化芳基卤化物双羰化合成α-酮酰胺的研究
短句来源
     (4) Potassium carbonate/ CoCl2 is found to have definite catalysis ability in the double carbonylation of benzyl chloride, and reaction product is phenylpyruvic acid (PPA) with yield 8.8%.
     相应产率达82.7%,高于文献值。 (4) 发现碳酸钾/氯化钴对氯苄双羰化有一定的催化活性,其双羰化产物为苯丙酮酸,产率为8.8%。
短句来源
     In view of these problems, a novel catalyst system CoCl2 / potassium pyrazine-2-carboxylate (KPzca) is found to have high stability, high catalytic activity and high selectivity for the double carbonylation of benzyl chloride to β-benzyl-α-phenylpyruvic acid (BPPA).
     本文针对氯苄双羰化传统催化剂八羰基二钴合成困难,极不稳定等问题,合成并筛选出一种新型的、高活性、高选择性的催化体系氯化钴/吡嗪-2-羧酸钾,一步双羰化合成出β-苄基-α-苯丙酮酸。
短句来源
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  double carbonylationof
     Synthesis of β-Benzyl-α-Phenylpyruvic Acid from Double Carbonylationof Benzyl Chloride Catalyzed by CoCl_2/KPzca System
     氯化钴/吡嗪-2-羧酸钾体系催化苄基氯双羰化合成β-苄基-α-苯丙酮酸
短句来源
  “双羰化”译为未确定词的双语例句
     THE MECHANISM OF ELEMENTARY REACTIONS OF ACETYLENE CARBONYLATION AND DICARBONYLATION OVER PALLADIUM COMPLEX CATALYSTS
     钯络合物催化剂上乙炔羰化和双羰化基元反应机理
短句来源
     Under 3.0 MPa CO pressure, at 100℃ and reaction time 6h,the percentage of conversion of iodobenzene was 100%, the selectivity of PhCOCONEt2 was more than 90%.
     在一氧化碳压力为3.0MPa,100℃下反应6h,碘苯转化率达100%,双羰化产物(PhCOCONEt2)选择性高于90%。
短句来源
     If the superadded ligand was potassium pyrazine-2-carboxylate(KPzca), the product was β-benzyl-α-phenylpyruvic acid (BPPA). To CoCl_2 /Kpzca catalytic system, K_2CO_3 could not increase catalytic activity, contrarily superfluous K_2CO_3 decreased BPPA yield.
     当配体改为吡嗪2 羧酸钾(KPzca)时,双羰化产物为β苄基α苯丙酮酸(BPPA),K2CO3的加入并不呈现特有的催化活性,相反,加入量太多时会降低BPPA的产率。
短句来源
     At the same time, double carbonylational catalysis ability of the catalysis systems which are composed of the other ligands and cobaltous chloride is researched.
     同时探讨了其它配体与氯化钴组成的催化体系的双羰化催化性能。
短句来源
     The main research contents are followed:(1) The conditions and catalysis activity of CoCl2/KPzca are studied in this paper.
     研究的主要内容为:(1) 研究了新型的氯化钴/吡嗪-2-羧酸钾双羰化催化体系,对氯苄双羰化反应的条件进行了优化,同时对该体系的双羰化机理进行了初步探讨。
短句来源
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The mechanism of elementary reactions of acetylene carbonylation and di-carbonylation based on suggesting the metal-carbene-ketone [M-C(sp)-M-C (sp2)] as intermediate has been studied. The metal-carbene with partial double bond may consist of a o-donation and a n-feedback interaction, the latter can be described approximately by a "Pauling 3-electron bond". The two unpairedelectrons with parallel spin remained are available for partially sharing and abound atom A-Y substrate to provide an "increased valence...

The mechanism of elementary reactions of acetylene carbonylation and di-carbonylation based on suggesting the metal-carbene-ketone [M-C(sp)-M-C (sp2)] as intermediate has been studied. The metal-carbene with partial double bond may consist of a o-donation and a n-feedback interaction, the latter can be described approximately by a "Pauling 3-electron bond". The two unpairedelectrons with parallel spin remained are available for partially sharing and abound atom A-Y substrate to provide an "increased valence structure",thatleads to the oxidative addition as well as the inserted reaction. The focal point of this study is the mechanism of elementary reactions of acetylene carbonylation and oxidative dicarbonylation over Pd catalytic systems under mild reaction conditions. The catalytic kinetics of these two reactions is examined, and the active complexes are suggested to be L2Pd(Cl)SnCl3 and C(CO)2Pd2X432-respectively. The possible reaction mechanisms are proposed, and partially demonstrated with simulators CPd(CO)SnCl3.Cl2]-1 and CPd(CO)Cls]-1 via quantum chemical (Xa) calculations.

以金属-烯酮中间体(L_2XM=C=O),作为在钯络合物催化剂上,乙炔羰化和双羰化配位催化机理的单元反应模型,其中反馈键组分可近似地用“Pauling”三电子键来描述。在L_2XM~xC~x=O分子中,定域在M—C两个原子上的两个自旋平行电子,相当于形成一个“增价结构”来提供C_2H_2的配位活化或氧化加成。对[Pd(CO)SnCl_3·Cl_2]~(-1)(A)和[Pd-(CO)Cl_3]~(-1)(B)模拟物的MOs能级及电荷分布的量化计算结果表明:(1)Pd—C键的强度被削弱;(2)模拟物(A)羰基碳原子带上较多正电荷,故容易发生RO~-亲核进攻反应。乙炔与钯络合物配位后,通过π-σ重排,其分子对称性由C_2v变化到Cs,导致前沿轨道能级下降,且LUMO由原来弱反键(C_2v)趋向于非键(Cs)。非键轨道可允许增加一对电子仍保持络合物的稳定。因此,Cs构型中心离子的配位可超越Tolman的16—18价电子规律。

The mechanism, catalyst required and reaction condition for catalytic corbonylation of olefines were described. The degree of reaction difficulty and yields distribution of various olefines were discussed on the basis of spatial effect as well as principle of electron donation and acception. While an optimized catalyst with high activity and selectivity is used ,it is possible to synthesizing a series of carboxylic acids(or esters) or alcohols under mild condition, thus a new way for fine chemical synthseis...

The mechanism, catalyst required and reaction condition for catalytic corbonylation of olefines were described. The degree of reaction difficulty and yields distribution of various olefines were discussed on the basis of spatial effect as well as principle of electron donation and acception. While an optimized catalyst with high activity and selectivity is used ,it is possible to synthesizing a series of carboxylic acids(or esters) or alcohols under mild condition, thus a new way for fine chemical synthseis can be developed.

介绍了烯烃催化羰化原理、反应历程以及对催化剂的要求和反应条件,依据空间效应和电子授受原理阐述了不同烯烃羰化和双羰化的难易程度和产物分布,文中指出选用高活性、高选择性的催化剂有可能在温和条件下合成系列的有机羧酸(酯)和醇,从而为精细石油化工合成开拓新途径。

This paper reports a method for preparation of α-ketoamide by using Palladium (Ⅱ) complexes catalyzed double carbonylation reaction of phenyl halide with carbon monoxide in the presence of diethylamine. Influence of temperature, CO pressure, solvents, amounts of diethylamine and triphenylphosphine as well as the halogen atom on the single, double carbonylation reaction have been investigted.

介绍了在二乙胺存在下,用钯络合物催化卤代苯经双羰化反应生成α-酮酰胺的方法。讨论了反应温度、CO压力、溶剂、二乙胺用量、三苯基膦用量和卤素原子对双羰化反应的影响。

 
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