查询词典 acid reaction

We synthesized a new monomer 1, 4-bis (4-fluorobenzoyl) naphthalene(1, 4-BFN) using the acyl chloride reaction and Friedel-Crafts acylation reaction of 1, 4-Naphthalenedicarboxylic acid with fluorobenzene.

第二部分，我们从1，4-萘二甲酸出发，经过酰氯化反应及付氏酰基化反应，合成了新型单体1，4-二（4-氟苯羰基）萘(1， 4-BFN)。

By considering efficiency and cost, the optimal operating conditions were chosen as: reaction temperature 60℃, reaction time 3 h, and concentration of formic acid 88%.

综合考虑分离效果和成本，选择最佳反应温度为60℃，处理时间为3h，甲酸浓度为88%。

The complex was characterized by FT-IR, XRD, BET, SEM and EDS. The resin-supported catalyst exhibited high catalytic activity in the Heck reaction and could be reused up to 17 times in NMP or 16 times in DMF at 90 ℃ in the Heck reaction of iodobenzene with acrylic acid.

该负载型催化剂对Heck反应表现出高的催化活性和很好的重复使用性能，于90℃的碘苯与丙烯酸的Heck反应中，在NMP溶剂中能重复使用17次，在DMF溶剂中能重复使用16次。

The effects of various reaction parameters including the dosage of the catalyst, the molar ratio of acetic acid to isoamyl alcohol and the reaction temperature are investigated.

在相同反应条件下，它催化异戊醇的酯化率明显高于以α-MnO_2纳米棒、γ-MnO纳米棒和Mn_3O_4纳米粒子作为催化剂时的酯化率。

The reaction path of isocyanic acid with carbon-hydrogen radicals CH, CH_2 and CH_3 have been investigated by using UMP2 method at 6-311 g level. The geometries of the stationary points and the changes of molecular structure along the reaction path are discussed.

在UMP2/6-311计算水平上，计算并讨论了碳氢自由基和异氰酸发生氢转移反应位能面上驻点的结构和分子结构变化，并依据 UMP2的优化构型，进一步采用UQCISD方法对反应途径上的驻点进行了单点能量计算。

Using ab initio methods, three molecular reactions about Isocyanic acid were investigated in this thesis, that is :(1) HNCO+HCO→TS→NCO+CH2O (2) A:HNCO+CN→TS→NCO+HCN B:HNCO+CN→TS1→INT→TS2→HNCN+CO (3) HNCO+NO2→TS1→INT1→TS2→INT2→TS3→HNNO+CO2 The theoretical studies show that the reaction (2) may occur by two different reaction channels, A and B.

本论文采用量子化学从头算方法，研究了异氰酸下列三个反应的反应机理和速率常数。

Using ab initio methods, three molecular reactions about Isocyanic acid were investigated inthis thesis, that is :(1) HNCO+HCO→TS→NCO+CH2O (2) A:HNCO+CN→TS→NCO+HCN B:HNCO+CN→TS1→INT→TS2→HNCN+CO (3) HNCO+NO2→TS1→INT1→TS2→INT2→TS3→HNNO+CO2 The theoretical studies show that the reaction (2) may occur by two different reaction channels,A and B.

本论文采用量子化学从头算方法，研究了异氰酸下列三个反应的反应机理和速率常数。

The optimal conditions were as follows: molar ratio of lauric acid to phytosterols 1.4:1, reaction temperature 120℃, SDS 1.5% and reaction time 4 hours. Under this condition, the yield of esterification reached 87.9%. After three steps of purification the content of phytosterol ester is about 93.1%. The product was determined as phytosterol laurate with FT-IR.

在酸醇摩尔比1.4：1，反应温度120℃，SDS用量1.5%反应时间4h的最优条件下植物甾醇酯化率可达到87.9%；反应所得的植物甾醇酯粗产品经3步提纯后纯度可达93.1%；对提纯过的产品进行红外光谱分析确定反应产物为植物甾醇酯。

The HPW/M-SiO2 catalyst is characterized by means of infrared-ray spectrum, X-ray diffraction and n-C4H9NH2 Potentiometric titration. The effects of amount of the catalyst, molar ratio of acid and alcohol, reaction temperature and reaction time on synthesis of methyl mandelate have been investigated.

运用IR， XRD和n-C4H9NH2电位滴定法测试技术表征HPW/M-SiO2催化剂，考察了催化剂用量、物料配比、反应温度和反应时间等对扁桃酸甲酯合成的影响。

In the CMKGM preparation section,with the indicators of DS andη, the optimum laboratory conditions preparation of a certain molecular weight of the high DS of CMKGM: reaction time (5～6) h, the theory of the degree of substitution (2～3), the molar ratio of monochloroacetic acid to Sodium hydroxide (2:1～3:1),the reaction temperature (55～65)℃, liquid ratio (10:1～12:1)mL/g, containing enthanol (50～70)%.

CM(来源：5e60ABC论文网www.abclunwen.com)KGM制备工艺研究中，以取代度、表观粘度为指标，建立了制备一定摩尔质量的高DS的CMKGM的实验室制备条件：反应时间(5～6)h、理论取代度(2～3)、氢氧化钠与氯乙酸摩尔比(2：1～3：1)、反应温度(55～65)℃、液料比(10：1～12：1)mL/g、乙醇体积分数(50～70)%。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。