查询词典 sulfonyl

This presumable suggested that the distance between phenyl ring fusing heterocycle and sulfonyl group is of importance, a shorter distance may not be beneficial, owing to a steric hindrance.

这反映了杂环并合的苯基与SO_2之间距离对活性的影响，距离过近对抑制作用有不利趋势，可能是位阻影响所致。

It provides a route tothe compounds which contains three functional groups, two carbon-nitrogentriple bonds and one carbon-carbon double bond. In water, metallic indiumpromotes carbon-sulfur bond coupling reaction of aromatic sulfonyl chloride withsuitable organic halides to afford sulfones. In the last chapter, metallic tin mediated allylation of aldimines with allylbromide was revealed.

第三章，我们研究了在水相介质中金属铟促进的烯丙基溴对1，1-二氰基-2-芳基乙烯的Michael加成反应，生成一个含碳碳双键和二个碳氮叁键的三官能团化合物，另外，金属铟在水介质中还可以促进芳基磺酰氯与卤代烃发生碳硫键的偶联，生成砜。

MSM is a natural sulfur-containing compound produced by kelp in the ocean. Sulfur is stored in almost every cell in the body. The highest concentrations are found in joints, hair, skin, and nails. MSM is claimed to be an antioxidant, cell rejuvenator, and joint healer.

MSM 是methyl-sulfonyl-methane的简称，它是一种自然有机的硫磺，硫磺是身体内第四大主要成份，而且在身体内的每个细胞内都可找到硫磺的成份，在食物中也可以找到硫磺的成份，但是因为清洗烹煮而会使硫磺成份流失，身体会藉用MSM来制造健康的新细胞，和增进身体的健康，同时MSM亦被视为是一种天然的止痛和抗肿成份。

A new method for synthesizing rosin allyl alcohol ester was studied. p-Toluenesulfonic acid allyl alcohol ester was first synthesized by O-acylation of allyl alcohol with p-toluene sulfonyl chloride, using NaOH as catalyst. Then rosin allyl alcohol ester was synthesized from sodium resinate and p-toluenesulfonic acid allyl alcohol ester.

探索了一种两步合成松香烯丙醇酯的新方法，即先以烯丙醇和时甲苯磺酰氯为原料，以NaOH为催化剂，通过O-酰化反应合成中间体对甲笨磺酸烯丙醇酯，再与松香钠皂发生亲核取代反应合成目标产物松香烯丙醇酯。

We introduced the sulfonyl group to P-amino alcohols derived from amino acids to prepare β-sulfonamide alcohols.

由于磺酰基的强吸电子作用，磺酰氨基不是作为给电子基团出现，而是和金属钛共同作为Lewis酸对反应起作用的。

Effect of several reaction factors on the yield of the synthesis of methane sulfonyl chloride is discussed.

阐述了利用二甲基二硫在相转移催化剂作用下，于盐酸介质中经氯气直接氧化，一步合成甲烷磺酰氯的工艺过程，讨论了几个主要反应因素对产物收率的影响，确定了适宜的工艺条件。

On the above mentioned basis, the process method of preparing continuously methane sulfonyl chloride was suggested.

用合成反应经产品分离后的母液作反应介质，合成了甲烷磺酰氯产品，提高了反应收率，增加了经济效益，减小了环境污染，获得了综合利用的效果。

This thesis studied mainly on the Cu catalyzed multicomponent reactions in the presence of terminal alkynes and sulfonyl azides.

本论文以Cu催化下磺酰叠氮和末端炔参与的多组分反应主要研究对象，全文共分三个部分，内容概要如下：第一章磺酰叠氮参与有机反应研究进展本章我们就磺酰叠氮的一些基本特征和最新研究进展进行了综述。

This thesis studied mainly on the Cu catalyzed multicomponent reactions in the presence of terminal alkynes and sulfonyl azide s.

本论文以Cu催化下磺酰叠氮和末端炔参与的多组分反应主要研究对象，全文共分三个部分，内容概要如下：第一章磺酰叠氮参与有机反应研究进展本章我们就磺酰叠氮的一些基本特征和最新研究进展进行了综述。

Ascorbic acid, a well-known natural antioxidant, was successfully used to remove the sulfonyl group of α-phenylsulfonyl acetophenone derivatives by photochemical method.

抗坏血酸作为众所周知的天然抗氧化剂，在光诱导电子转移反应中被成功地运用到α-苯磺酰基苯乙酮衍生物磺酰基基团的移除反应中。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。