查询词典 silyl

In another direction, the radical cyclization of thioimide with acylsilane produced simple cyclization product in low yield without expected enol silyl ether compound.

对於硫醯亚胺与矽基酮的自由基反应，则是得到低产率的简单环化产物，而不是预期的烯醇矽醚化合物。

However, in the case of TsN〓 withsilyl ketene acetals, an unexpected alkoxy migration occurred.

而且在研究对甲苯磺酰叠氮和silyl ketene acetals的对比反应中，我们还发现了烷氧基迁移的现象。

Study on the Approach and the Medchine for the Deprotection of Silyl Ether by Sodium Periodate

过碘酸钠去硅醚保护基方法及机理的研究

Pleasingly, the residual thiophenol could be readily removed without silyl ether hydrolysis via passage of the product through a pad of basic alumina.

怡人、残硫可随时取消含硅基醚通过经水解产物透过垫基本氧化铝。

In this paper, 2,6-dimethyl-1,4-phenylene oxidel was modified by trimethyl chlorosilane and triphenyl chlorosilane, and a serfes of silyl-substituted PPO were synthesized.

讨论了聚2，6－二甲基－1，4－苯撑氧与三甲基氯硅烷和三苯基氯硅烷的反应，合成了一系列取代含量不同的三甲基硅取代PPO和三苯基硅取代PPO。

Via comprehensive computations, the possibilities of vinylidene and allene intermediates were excluded, and the reaction mechanism was found to contain the following three steps:(1) gold-catalyzed cyclization to give the cyclic intermediate,(2) the cyclic intermediate undergoing a 1,3-H migration to give a more stable intermediate, with the assistance of water-cluster,(3) finially, the 1,2-H or 1,2-silyl migration occuring for generation of the observed product.

通过对各种可能的反应路径的进行计算和比较，排除了亚甲基卡宾和连二烯中间体的可能性，并确定该异构化反应机理包含以下三个步骤：（1）炔丙基吡啶反应在金催化条件下发生分子内的成环得到环状中间体；（2）环状中间体在水分子簇的协助下优先发生1，3-氢迁移反应，异构化得到更为稳定的中间体；（3）最后再进行1，2-氢迁移或是1，2-硅烷基团迁移即得到实验中所观察到的环异构化产物。

Quinone methides, generated in situ from the reaction of 4-hydroxycoumarin with benzaldehyde, formaldehyde and pentanal, underwent the Diels-Alder reaction with silyl enol ethers to give a series of 3,4-dihydro-2H,5H-pyrano[3,2-c][1]benzopyran derivatives in high yields.

通过4-羟基香豆素与苯甲醛、甲醛和戊醛缩合产生的quinone methide与烯醇硅醚的Diels-Alder反应，以较高产率合成了一系列含有硅氧基的3，4-二氢-2H，5H-吡喃并[3，2-c][1]苯并吡喃-5-酮衍生物。

Alkyl manganese pentacarbonyl compounds5MnR (R = CH3, p-CH2C6H4CH3, p-CH2C6H4OCH3) were synthesized by metalation of manganese pentacarbony potassium salt with corresponding alkyl halides in ether. Photolysis of these with 1-2 equivalent of (CH3)2(C6H5)SiH or (CH3)(C6H5)2SiH in C6D6 solution at 5℃ produces silyl manganese pentacarbonyl compounds5MnSi(C6H5)(CH3)2 and5MnSi(C6H5)2(CH3) respectively (yield 70-88%).

用五羰基锰钾盐和相应的卤代物在乙醚中的金属化反应合成了五羰基锰烷基合物5MnR（R = CH3，p-CH2C6H4CH3， p-CH2C6H4OCH3 ），产率达到72-93％，将这些化合物与1-2当量(CH3)2(C6H5)SiH和(CH3)(C6H5)2SiH的C6D6溶液在5℃光解，分别得到五羰基锰硅烷基化合物5MnSi(C6H5)(CH3)2和5MnSi(C6H5)2(CH3)（产率达到70-88％）。

At present, a win is a global market Chlorosilane leader in the field, but also the global silyl product, one of the major manufacturers.

目前赢创是全球的氯硅烷市场领域中的佼佼者，同时也是全球甲硅烷产品的主要生产商之一。

STUDY ON THE APPROACH AND THE MEDCHINE FOR THE DEPROTECTION OF SILYL ETHER BY SODIUM PERIODATE Abstract Silyl ethers are the most widely used hydroxyl protecting groups in organic synthesis.

第二部分：过碘酸钠去硅醚保护基方法及机理的研究硅醚保护基种类多，稳定性较好，且反应简单，作为羟基的保护基在有机合成中得到广泛应用。

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％。