异丁基

Mainly engaged in: Hydrogen-imide hydrochloride, o-chlorophenyl cyclopentanone, 3.4 dimethoxy ethyl benzene, butyn single potassium acid, potassium ethyl malonyl, Ding amide, amide isobutyraldehyde , allyl chloroacetate, isopropyl chloroacetate Benzyl aluminum, cyclopentene, cyanide-o-chlorophenyl, o-methyl chloride, sulfuric acid chloride, p-chlorophenol, imidazole, Pinacolone, one chlorine Pinacolone.

主要经营：盐酸氢亚胺、邻氯苯基环戊酮、3.4二甲氧基苯乙酯、丁炔二酸单钾盐、丙二酸单乙酯钾盐、丁酰胺、异丁酰胺、氯乙酸烯丙酯、氯乙酸苄酯异丙醇铝、环戊烯、邻氯苯氰、邻氯苯甲酯氯、硫酸氯、对氯苯酚、咪唑、频呐酮、一氯频呐酮。

Catalysts in three synthesis routes,the hydroxylation of 4-tert-butyl-phenol,the alkylation of pyrocatechol by tert-butyl alcohol and the alkylation of pyrocatechol by isobutene,were discussed in detail in terms of reaction conditions,catalysts,temperature,reaction time etc.

论述了对叔丁基苯酚羟基化法、邻苯二酚与叔丁醇烷基化法和邻苯二酚与异丁烯烷基化法生产对叔丁基邻苯二酚的合成路线的催化剂。

Uncured natural rubber is sticky, easily deforms when warm, and is brittle when cold. In this state it cannot be used to make articles with a good level of elasticity .

一般需经过硫化的橡胶品种有丁二烯、氯丁二烯、异戊二烯的1，4-聚合物--顺丁、异戊、氯丁橡胶，以及共聚物丁苯、丁基和丁腈橡胶等。

In present study, a liquid-liquid extraction method was employed to extract the volatile components in mulberry fruit sparkling wine. The analysis with gas chromatography-mass spectrometry detected 69 peaks, among which 63 volatile components were identified. The first 9 volatile components with high relative content were benzyl alcohol, 2-methyl-1-butanol, mono-(2-ethylhexyl)-1, 2-benzene dicarboxylic acid, 3-methyl-1-butanol, toluene, acrylic acid butyl ester, 1H-indole-3-ethanol, isodecyl octyl phthalate and decyl octyl phthalate.

采用液－液萃取法提取桑椹汽酒中的挥发性成分，经气相色谱－质谱联机分析，共检测出69个峰，鉴定出63种挥发性化合物，其相对含量排在前9位的挥发性化合物分别是苯乙醇、2-甲基－1-丁醇、1，2-苯二酸单（2-乙基）己酯、3-甲基－1-丁醇、甲苯、丙烯酸丁酯、1H-吲哚－3-乙醇、邻苯二甲酸异癸基辛基二酯、邻苯二甲酸癸基辛基二酯。

The first asymmetric synthesis of trans-β-hydroxy-γ-butyrolactones:-(3R, 4R, 5S)-4-(1-acetoxy-isopropyl)-3-hydroxy-butyrolactone 65a was achieved starting from isobutylaldehyde through nine steps. The key steps involve the construction of three chiral carbon centers by the Sharpless's asymmetric epoxidation and Substrate directable chemical reaction.

以异丁醛为起始原料，经过九步反应首次设计合成了具有三个手性中心的trans-β-羟基-γ-丁内酯：-（3R，4〓，5S）-4-（1-乙酰氧基-异丙基）-3-羟基-丁内酯65a，关键步骤是Sharpless不对称环氧化和底物定向不对称合成反应。

The results showed that the shape selective effect of the faujasite is obvious, and the thermodynamic balance exists between 2,6 DTBN and 2,7 DTBN.

结果表明，八面沸石对该反应过程有较好的择形催化作用，两种异构化产物(2 ，6 二叔丁基萘和 2 ，7 二叔丁基萘)之间存在着热力学平衡，即两种异构化产物可在酸性中心位上相互转化。

The latter is hydrolyzed in the acidic conditions, then the recovered copolymer of EO and glycidol with multi pending hydroxymethyls is esterified with 2-bromoisobutyrylbromide to produce the ATRP macroinitiator with multi pending bromoisobutyryl groups .

共聚物poly的羟基与2-溴异丁酰溴进行酯化反应，得到侧链挂有2-溴异丁酸酯基结构的可以用于原子转移自由基聚合体系的大分子引发剂Poly_

The volatile components were separated and identified using GC-MS technique. RESULTS Seven ingredients were. isolated: 2-ethyl-hexyl-adipate (66.5%), 1-methoxy-4-(1-propenyl)benzene (12.5%), isopropyl isothiocyanate (6%), isobutylisothiocyanate (6%), 6-methyl-5-heptene-2-one (3.5%), benzaldehyde (1.4%), phenylacetaldehyde (0.8%).

结果 分离出7个成分，采用峰面积归一化法确定了各成分的相对含量，分别为66.5%双－2-乙基己基－己二酸、12.5%1-甲氧基－4-（1-丙烯基）苯、6%异硫氰酸异丙酯6%、6%异硫氰酸异丁酯、3.5%6-甲基－5-庚烯－2-酮、1.4%苯甲醛、0.8%苯乙醛。

The results showed that the POV of hemp seed oil was affected remarkably by temperature and time, and the effect of temperature was greater than that of time. The TBHQ had good antioxidation ability to hemp seed oil. TBHQ or BHA with isoascorbic acid or critic acid exhibited great antioxidation ability, the synergistic effect on the oil of critic acid was better than that of isoascorbic acid. When 0.02% TBHQ with 0.005% BHA and 0.01% critic acid or with 0.005%BHA and 0.01% isoascorbic acid was used in the oil, the shelf life of the oil could be prolonged from 4 months to 11~13 months at 20℃.

结果表明，温度、时间对汉麻籽油的自氧化过程有显著影响，且温度的影响更明显；叔丁基对苯二酚对汉麻籽油具有较好的抗氧化性能，柠檬酸和异Vc对TBHQ与丁基羟基茴香醚复配的复合抗氧化剂均表现出较强的协同抗氧化性能，且柠檬酸的协同抗氧化性优于异Vc；添加0.02%TBHQ+0.005%BHA+0.01%柠檬酸或0.02%TBHQ+0.005%BHA+0.01%异Vc复合抗氧化剂，可使汉麻籽油在20℃下的预贮藏时间从4个月延长至11~13个月。

In the contaminated lard sample, 6 organic compounds have been thus identified to be the raw materials or byproducts in the production of organic tin compounds. Based on the identified contaminants, it can be postulated that the chemical structure of the organic tin compound is dibutyltin-bis-(2-isooctyl thioacetate). The method is simple and precise, and has not been reported in the local literature.Keywords Organic tin compound, Lard, SPME－GC－MS

经过摸索研究，采用固相微萃取方法富集挥发性杂质，直接注入色谱中，经色谱分离，质谱测定，确定了杂质的结构，由杂质成分推断生产有机锡所用的原料，然后判断合成路线，最后确定有机锡的结构，从有毒猪油中鉴定出2－巯基醋酸异辛酯、双（2－醋酸异辛酯）二硫、双醋酸异辛酯硫醚等6种与有机锡有关的杂质，并与相应的有机锡工业品对照，发现工业品中也含有这些杂质，与其合成过程的原料及副产物相符，从而确定有机锡化合物为二硫代醋酸异辛酯二丁基锡。

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。