醇盐

Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoholysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepared by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,magnesium di-isobutanolate.

该方法适用于较高沸点的伯醇的醇镁化合物，例如正丙醇镁、正丁醇镁、异丁醇镁等，但是用醇解法制备出的叔丁醇镁，其纯度只有80％，这是由于叔丁醇具有较大的空间位阻效应，阻碍了醇交换的进一步进行，并且叔丁醇沸点与甲醇相差不大，使得甲醇难以快速蒸出，只能得到一种混合醇盐产物。

Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoho- lysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepare- d by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,m- agnesium di-isobutanolate.

该方法适用于较高沸点的伯醇的醇镁化合物，例如正丙醇镁、正丁醇镁、异丁醇镁等，但是用醇解法制备出的叔丁醇镁，其纯度只有80％，这是由于叔丁醇具有较大的空间位阻效应，阻碍了醇交换的进一步进行，并且叔丁醇沸点与甲醇相差不大，使得甲醇难以快速蒸出，只能得到一种混合醇盐产物。

The effect to rate of production of the reaction active of different alkaline earth, the reaction efficiency of different low-carbon alcohols and reaction time were investigated.

考察了不同碱土金属、不同低碳醇及反应时间对醇盐产率的影响。

Gold and silver ; metal alkoxide ; low carbon multicomponent alcohol

金银；金属醇盐；低C多元醇

The porous TiO2 anatase nanometer thin films were prepared from alkoxide solutions containing polyethylene glycol PEG by sol-gel method.

锐钛矿型多孔TiO2纳米薄膜可以从含聚乙二醇PEG的钛醇盐溶胶前驱体中通过溶胶-凝胶法制备。

The porous TiO2 anatase nanometer thin films were prepared from alkoxide solutions containing polyethylene glycol by sol-gel method.

锐钛矿型多孔TiO2纳米薄膜可以从含聚乙二醇的钛醇盐溶胶前驱体中通过溶胶-凝胶法制备。

The results showed that it is feasible to synthesis the rare earth alkoxide by taking the alkaline earth alkoxides as the providers of alkoxy.

结果表明，以碱土金属醇盐为烷氧基提供者制备稀土金属醇盐是可行的。

For the stepwise mechanism, the ethylene molecule was firstly adsorbed at the Brnsted acid site via π-hydrogen bonding to form a stable complex, which then went through the protonation, leading to the formation of the ethoxide intermediate. Furthermore, the ethoxide reacted with the second ethylene molecule to form the butoxide product.

对于分步反应机理，乙烯分子首先通过π-氢键作用在酸性位形成稳定的吸附络合物，再进一步发生质子化并生成乙醇盐中间体，随后乙醇盐与第二个乙烯分子发生碳－碳键结合形成丁醇盐产物。

This dissertation successfully fabricated cross-linked polysiloxanes under base catalysts such as potassium hydroxide siloxanolate or tetramethylammonium hydroxide (Me_4NOH) siloxanolate by anionic ring-opening copolymerization of cyclosiloxanes and Polyhedral Oligomeric Silsesquioxanes as multifunctional monomers.

本论文首次通过阴离子开环共聚，成功地将POSS大分子作为多官能团单体，与环硅氧烷在KOH硅醇盐或Me_4NOH硅醇盐等碱性催化剂的作用下，直接合成交联聚硅氧烷：通过调节POSS大分子和环硅氧烷单体的种类以及化学计量比，可合成出一系列不同种类和不同交联密度的交联聚硅氧烷；并对其阴离子开环共聚机理以及极性调节剂DMAc对凝胶时间的影响进行了详细讨论；同时借以凝胶含量和溶胀比、GPC、FT-IR、固体~(13)C和~(29)Si NMR、WAXD、DSC以及TG等手段对所得聚合物的微观结构以及热性能进行了详细考察。

The alkaline earth calcium presents higher reaction activity comparing to magnesium.

碱土金属钙醇盐为烷氧基提供者制备稀土醇盐其反应活性要高于金属镁醇盐。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。