丁酸

The oxido-reduction and reduction-reoxidation specificity of heteropolyacid salts containing various kinds of alkali metals used for one-step oxidition of isobutyraldehyde to produce methacrolic acid was studied by ESR method.

用ESR法研究了异丁醛一步氧化制甲基丙烯酸过程中所用杂多酸盐催化剂的氧化－还原特性。

Isopropyl 1,3 benzodioxolane was synthesized from catechol and isobutyric aldehyde using the phosphotungstic acid supported on activated carbon as catalyst.

以邻苯二酚和异丁醛为原料，活性炭固载磷钨酸为催化剂合成了杀虫剂呋喃丹的中间体2 -异丙基- 1，3-苯并二氧五环。

Starting with commercial available tosylmethyl isocyanide and but-2-enoic methyl ester, pyrrolo[2,1-f][1,2,4]triazine derivatives was prepared by twelve-steps process in total yiled of 5.0%~8% via pyrrole and pyrrolo [2,1-f] [1,2,4] triazine ring formation, substitution and amination reactions etc.

本文以简单的对甲基苯磺酰甲基乙腈和反-2-丁烯酸为原料，经过形成吡咯，吡咯并[2，1-f][1，2，4] 三嗪环，取代，酰胺化等等12步反应，合成了结构新颖的吡咯并[2，1-f][1，2，4] 三嗪衍生物，总收率达5%～8%。

The dissertation mainly consists of two parts:1. The Reaction Chemistry of Alkynes under Palladium Catalysis Part 1 studies the reaction α,β-unsaturated carbonyl compounds with alkenylpalladium intermediate generated by nucleopalladation, and discovered 1 the Pd-catalyzed tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls,2 the four-component tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls, 3 the tandem intramolecular oxypalladation-conjugate additionreaction of alkynoic acids with α,β-enals. These new reactions provide notonly efficient highly stereoselective methods for the synthesis of γ,δ-unsaturated,polyunsaturated carbonyl compounds and γ-lactonic aldehydes, but also thebasic transformations for a number of C-C bond formation reactions which can be usedto design synthesis of many acyclic, cyclic or polycyclic compounds.

本论文的主要工作分为两个部分：一、钯催化下炔烃的反应化学在本小组前人工作的基础上，我们详细研究了炔烃亲核钯化产生的烯基钯中间体与α，β-不饱和羰基化合物的反应，发现两价钯催化下卤离子-炔烃-α，β-不饱和醛酮的串联加成反应、卤离子-炔烃-α，β-不饱和醛酮的西组分串联加成及炔酸分子内氧钯化-串联Michael型加成反应；由此发展了γ，δ-不饱和醛酮、多不饱和羰基化合物和带有醛酮基侧链的γ-丁内酯衍生物的高立体选择性合成方法，这一过量卤离子存在下的烯基钯对α，β-不饱和羰基化合物共轭加成反应的发现，为大量碳-碳键形成反应的实现提供了基础，使我们能够从这一基本反应出发，设计和开发多种分子内、分子间的碳碳成键反应，以好的立体、区域选择性组建开链、环状及多环类型的化合物。

On the days when dessert is a name given to a handful of chocolates and a little preserved ginger, when macedoine de fruits is the title bestowed on two prunes and a piece of rhubarb, then the orange, however sour, comes nobly to the rescue; and on those other days of plenty when cherries and strawberries and raspberries and gooseberries riot together upon the table, the orange, sweeter than ever, is still there to hold its own.

首先，橘子是日常生活中的常客，即便客观事实可能并非如此，但至少在水果店里，橘子确实是四季都有供应。）曾几何时，甜点仅仅就是一把巧克力加上一丁点腌制的姜，两个西梅脯加上一块大黄茎居然也美其名曰为水果什锦。那么相比之下，不管有多酸，橘子都可以说是解了燃眉之急，极大地丰富了人们的餐桌。又曾几何时，在那些衣食富足的年月，餐桌上樱桃，草莓，覆盆子和醋栗大聚会，好不热闹，但即便如此，橘子也依然能占有一席之地，而且此时的橘子吃起来无疑是最甜的。

Using butyl-xanthate as collector, marmatite can be activated by Cu2+ with the presence of glyceryl-xanthate and then possesses good floatability,while pyrite can't be activated,therewith these two minerals can be separated.

结果表明，用丁黄药作捕收剂，在甘油基黄原酸钠存在下铁闪锌矿能被Cu2+活化从而具有良好的可浮性，而黄铁矿不能被Cu2+活化，从而实现两种矿物的选择性分离。

In the central, 5-HT can induce the release of inhibitory neurotransmitter γ-aminobutyric acid etc. through 5-HT2A receptor resulting in analgesia. In the peripheral, 5-HT can active the nociceptor and advance the traumatic information transmission.

在中枢可以通过2A受体引起抑制性神经递质γ-丁氨酸等的释放，从而发挥镇痛作用；在外周参与伤害性感受器的活化，促进伤害性信息的传递。

This paper confirmed that the microcapsule from sodium alginate and which is used in carbonless copy paper by single cogulation process owns higher embedding ratio and better nonpermeability stableness and strength.

本文对以海藻酸钠为壁材、以结晶紫内酯的邻苯二甲酸二丁酯溶液为芯材通过单凝聚法制备无碳复写纸用微囊的工艺条件进行了研究，制定了工艺路线和流程，确定了最佳的乳化条件、絮凝条件、固化条件以及壁材浓度、芯壁比，并对成品微囊进行了应用性的对比分析。

The properties of material were studied by adjusting the scale of 1,4-butylene glycol, index of isocyanate, the content of SiO_2 and stannous octoate.

试验了1，4-丁二醇比例、白碳黑和辛酸亚锡含量、异氰酸酯指数对弹性体性能的影响，测试了材料的力学性能和粘度变化。

The Polyether Polyurethane elastomer were prepared from hydroxyle-terminated polybutadiene, isophorone diisocyanate, 1,4-butylcne glycol, stannous octoate and SiO_2 in direction.

以端羟基聚丁二烯、异佛尔酮二异氰酸酯、1，4-丁二醇、白碳黑、辛酸亚锡等为原料，采用一步法制备了聚烯烃型聚氨酯弹性体材料。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。