查询词典 reagent

To the clear solution of the Grignard reagent, 1.5mol equivalent ofMe(OCH_2CH_2)_2OMe as tetrahydrofuran solution was added drowise at about 0—10℃ during 30 min.,and the mixture was stirred for 3h.

在制备烷基镁的过程中即使加入1.5摩尔当量的二甘醇二甲醚，烷基镁的收率只有88％，这是今后要继续研究的重要方向。

To the preparation of the side chain, we exploit Sharpless Asymmetric Epoxidation, Grignard reagent epoxide opening and selective hydroboration reaction as key steps.

在探索制备手性六元环的过程中，发展了一种高效制备手性砌块49的方法，并利用乙烯基格氏试剂对49的不对称Michael加成制备了手性六元环56。

To the clear solution of the Grignard reagent,1.5mol equivalent of Me(OCH2CH2)2OMe as tetrahydrofuran solution was added drowise at about 0--10℃ during 30 min.,and the mixture was stirred for 3h.

在制备烷基镁的过程中即使加入1.5摩尔当量的二甘醇二甲醚，烷基镁的收率只有88％，这是今后要继续研究的重要方向。

5 G Benzaldehyde was added dropwise at 0 °C to a Grignard reagent from 4 g Mg and 20.6 g 2 Bromopropane, and the mixture stirred 0.5 h at room temperature, yield, 20.5 g isopropylphenylcarbinol.

在 0°C时，将 1 6.5g苯甲醛滴加到由 4g Mg和 2 0 。6g2 -溴丙烷制得的 Grignard试剂中，在室温下搅拌 0 。5h，得到 2 0 。5g异丙基苯甲醇。

Bis-silylhydrides were prepared by nickel-catalyzed olefination of the corresponding aryl dithioacetals with Grignard reagent followed by LAH reduction.

镍催化双硫缩醛化合物与格林纳试剂偶合反应可以方便的得到乙烯基矽基醚，再经由LAH还原反应，得到相对应的矽基氢化合物。

A series of β-vinyl alcohols were synthesized using methyl alkyl ketones or methyl aryl ketones and allyl chloride as starting materials by Grignard reagent method.

以烯丙基氯和甲基酮为原料，通过格氏试剂法合成了-β烯醇化合物，并探讨了各种因素对收率的影响，获得了控制反应过程的最佳参数。

These methods oftenyield widely different results so that the results must be traceable to the referencemethod to assure the accuracy and comparability.In 1964 the Expert Panel on Haemoglobinometry of ICSH drew uprecommendations for haemoglobinometry in human blood that were published in1967. The method had been revised three times; the apparatus, reagent and procedurehad been changed. We have established the reference method in our laboratoryaccording to the requirements of ICSH. Its methodology characteristics need to bevalidated whether the method is fit for charaterisation of haemiglobincyanidereference material.

国际血液学标准化委员会于1967年确定了血红蛋白的参考方法，至今该方法已修订三次，仪器、试剂、操作程序等都有改变，本实验室按照ICSH的要求建立了血红蛋白测定的参考方法，为了验证血红蛋白参考方法用于标准物质定值的可行性，我们对血红蛋白测定参考方法的性能进行了评价。

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。