羰基的

The mechanism of thiocarbonyl compounds with thiourea function group has been proposed according to the photoreaction products.5. Total of one heterocyclothione intermidate and four heterocyclothione compounds have been synthesized and structurally characterized.

根据所得到的产物对具有硫脲基团的硫羰基化合物的光反应机理进行合理的推测。5、合成与表征了1个环硫酮中间体和4个杂环硫酮类化合物，摸索出合成杂环硫酮中间体较佳反应条件。

Based on literature procedures, a dithiol tridentate ligand containing amino groupand its iron carbonyl complex (4) are synthesised and characterised. An attempt isalso made to protonate this complex.

在文献方法的基础上也合成了含有氨基的二硫醇三齿配体及其铁羰基化合物[Fe_2(SCH_2)_2C(CH_2NH_2)_5](4)的合成与表征，尝试了合成该化合物的质子化产物。

First, the geometry optimization for 1-phenyldibenzophosphole and triphenylphosphine were carried out using quantum chemical AM1 method.

用量子化学AM1方法优化了1-苯基二苯并膦和三苯基膦的几何构型，比较了两种化合物的电子结构和空间结构，发现PDBP作为羰基合成铑膦催化剂的配体要优于三苯基膦；系统研究了PDBP的合成方法，其最佳合成条件为：在无水无氧的条件下，采用二乙胺锂与溴化四苯基膦摩尔比为3，反应温度为22 ℃，反应5 h，反应后酸化， pH值为1～2，产物收率可达到85％～88％。

Compared with the present process for the synthesis of acrylate by esterification of acrylic acid, which comes by oxygenation of propylene, the process by the carbonylation of acetylene to acrylic acid and its esters pays less cost, and so, is worth to be studied.

相对于目前主张的丙烯氧化法生产丙烯酸，再酯化生产丙烯酸酯的主流工艺，乙炔羰基化法合成丙烯酸及酯的工艺具有很好的经济性应用价值。

Papers in the experimental part of our literature considered on the basis of the experimental exploration, and podophyllotoxin intermediates with the structural characteristics of a simple pepper aldehyde as the starting material,α,β-unsaturated carbonyl compounds are selective reduction lithium aluminum hydrogen reduction reaction as the key steps to have the Knoevenagel condensation, peracetic acid epoxy between chlorine and alkaline hydrogen peroxide epoxy, DCC condensation esterification reaction of the three podophyllotoxin intermediates.

论文实验部分我们在综合考虑文献的基础上，经过实验摸索，并结合鬼臼毒素中间体的结构特点以简单的胡椒醛为起始原料，对α，β-不饱和羰基化合物具有选择性还原的锂铝氢还原反应为关键步骤，先后经过Knoevenagel缩合，间氯过氧苯甲酸环氧化，碱性过氧化氢环氧化，DCC缩合酯化等反应合成了3个鬼臼毒素中间体。

The results indicate that the microwave absorptive performance of flake iron absorbents is better than that of CIP, it may be designed as a potential electromagnetic wave absorption material.

参数的测试和反射率计算结果表明，制备出的片状铁吸收剂性能优于传统的羰基铁粉吸收剂，是一种非常有潜力的吸收剂。

In this thesis, synthesis of fluoroalkyl-containing heterocycles from rhodium acetate catalyzed reactions of fluorinated α-diazo-β-ketoestes were studied in detail.

本论文系统地研究了氟烷基和二氟亚甲基取代的α-重氮羰基化合物的合成及其在醋酸铑催化下的反应。由此合成了一系列氟烷基和少氟取代的杂环化合物。

According to mineralogical and chemical characteristics of cobalt-rich crust samples from the west Pacific ocean, the reagent formula used in common nickel sulfide fire assay preconcentration for PGE analysis were modified.

根据西太平洋麦哲伦海山富钴板状结壳样品的成分特征，对常规的锍镍试金配方作了改进；酌情减少捕集剂羰基镍的加入量，可显著降低铂族元素的空白值。

Bromo-5-formyl -3-methylpyrrole is an important intermediate of tolyporohin. On the base of introducing the present research and development of tolypo- rohin and pyrroles ramification at home and abroad, an emphasis was made on synthesis of 2-Bromo-5-formyl -3-methylpyrrole and the technical conditions of all steps, which was described as follows.

由于2-溴-5-甲基-3-甲基咯是合成托尼吩的重要中间体，本文在阐述了当前托尼吩及咯衍生物的国内外研究和开发的基础上，重点研究了2-溴-5-甲基-3-甲基咯的合成，并对各步反应进行了工艺研究，具体合成步骤如下：本文通过对乙乙酸乙酯的亚硝化、还原、成环，反应生成咯单环衍生物2，4-二乙氧羰基-3，5-二甲基咯。

The results indicated that the adsorbance of adsorbed CO in the presence of alkali and rare-earth metal oxide decreased, and thus suppressed the nick loss in the form of Ni〓 in the POM process.

CO-FTIR的结果表明，锂和镧的添加可明显减少CO在NiO/γ-Al〓O〓上的吸附，从而抑制反应过程中羰基镍的生成和流失，同时也抑制了CO的歧化积碳和在表面进一步氧化成CO〓。3。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。