氢化

However, the rhodium process with oil compounds encounter problems due to the thermal sensitivity of the high boiling point oxo-products, which cannot be isolated from the homogeneous reaction mixture by distillation.

采用~1H-NMR和FT-IR谱分析了油醇的氢甲酰化反应产物，证实了其结构为甲酰基十八碳醇，且甲酰基的位置可以在主碳链的中间或端位。

The phosphine concentration and distribution were mainly affected by the organic phosphorous, the redox potential and the sediment composition.

磷化氢在沉积物中的含量分布主要受沉积物中有机磷含量、氧化还原电位及沉积物的组成等多种因素共同的影响。

The experiment results indicated that the hydroformylation of C〓 straight chain higher olefins could well conduct under TPSC system.

实验结果表明，温控相分离催化体系可很好地催化C〓直链高碳烯烃氢甲酰化反应。

The optimization reaction condition is that using the mixture catalyst of phosphorous acid ester and dihydrogen phosphate, and toluene as solvent, at 105 oC and refluxing 30 hours, the yield is 90% with purity over 95%.

在最佳条件下，即在混合催化剂亚磷酸酯/磷酸氢盐的作用下，以甲苯为溶剂，在105 ℃反应30 h，酯化收率90%，纯度95%以上。

It was demonstrated that glacial acetic acid could promote the transition from hydroxide to oxide and enhance the crystallization of product, which is consistent with the results in nano-MgO preparation by modified precipitation.

说明冰乙酸在此制备过程中的促进了由氢氧化物到氧化物的转变，有利于产物的晶化，这与修饰沉淀法制备纳米MgO中的结论是一致的。

The effects of the sodium bisulfate dosage, reaction temperature, water content, methanol flow rate on the conversion rate of waste oils were investigated.

考察了硫酸氢钠用量、反应温度、反应体系含水量、甲醇流量等对酯化反应转化率的影响。

The research aimed to study the esterification of waste oils catalyzed by sodium bisulfate and provide references for the production of biodiesel by solid acid catalyzed wasted oils.

［目的］研究硫酸氢钠对废油脂酯化催化作用，为固体酸催化废油脂生产生物柴油的研究提供参考。

Iminodiacetic acid and aspartic acid reacting with t-butyloxycarbonyl anhydride in the basic solvent system of 1,4-dioxane-water gave better yields than those from conventional t-BuOH/H 2O system method,while glutamic acid in both solvent systems of 1,4-dioxane-water and tetrahydrofuran-water also gave better yield.

其中Boc酐法反应条件温和，操作简便，试剂易得且经济，是实验室制备Boc保护的氨基酸的常用方法。常规Boc酐法多采用叔丁醇水和四氢呋喃水的溶剂体系。我们用常规Boc酐法制备Boc 亚氨基二乙酸时，多次重复，收率总是低于 5 0 %，对天冬氨酸和谷氨酸进行Boc化时也有类似情况。

The main component dehydroabietic acid and little component abietic acid, neoabietic acid, levopimaric acid and pulustic acid of a few types disproportionated rosin were determinated quantitatively by selecting the proper order of derivative, differential wavelength difference, scanning rate and quantitative method.

通过选择合适的求导阶数、微分波长差、扫描速度和定量方法，对不同批号的歧化松香中的主成分脱氢枞酸和微量组分枞酸、新枞酸、左旋海松酸及长叶松酸进行了测定(其中左旋海松酸和长叶松酸测定的是合量)，实验结果令人满意。

0 G of cyclopentyl bromide and 19.4 g of magnesium are reacted in ether or THF to give a cyclopentyl Grignard reagent.

一百十九点零克的环戊基溴化镁和克一十九点四顷反应乙醚或四氢呋喃给予一个环戊格氏试剂。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。