值得注意的是， 这种糖片段上有芳环取代的烷酰氧基基团的麦角甾烷型甾体糖苷为真菌中首次报道。
It is worth while to note that the steroidal glycoside possessing an aromatic ring substituted alkanoyl group at its glucose moiety was found for the first time in fungi .
采用本发明的拆分方法制备单一手性2-杂环取代的 二氢嘧啶化合物的产物收率为20％以上，光学纯度达98％以上；
The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent;
报道了通过串联环加成芳构化反应合成多取代芳族化合物的方法。
The synthesis of polysubstituted aromatic compounds by using a tandem cycloaddition aromatization reaction was reported.
第一商业上成功的第三代散堆填料取代广泛使用的鲍尔环。
First commercially successful third-generation random packing replacing the widely used Pall Ring.
芳环上取代基性质对产物分布的可调性具有重要的影响。
The properties of the substituents on aromatic ring would influence whether the product distribution could be controlled conveniently.
通过变换环上的取代位置，可以有效地调控环的电性质，从而调控单分子膜的电化学性质。
By changing the replacement position, the electrical properties of rings could be controlled effectively, so did the electrochemical properties of SAMs.
对所有共振谱线进行了全面归属，并讨论了不同取代基和环内不同杂原子对化学位移值的影响。
All of the resonance lines were fully assigned and the effects of substituents and heteroatoms in ring on chemical shifts were discussed.
一种取代活塞环表面电镀硬铬的复合涂层及其加工方法。
The invention relates to the composite coating and machining method replacing the chrome-faced piston ring.
采用非等温差示扫描量热法(dsc)研究了一种长侧链取代液晶环氧单体与甲基六氢苯酐的固化反应历程，考察了体系的固化反应动力学特征。
A liquid crystalline epoxy monomer with long lateral substituent was cured with anhydride and the cure kinetics was investigated by non-isothermal DSC technique.
并讨论了苯环上不同取代基对冠醚环上各碳化学位移的影响。
The influences of benzine ring's different sub-stituets on the chemical shifts of crown's carbons are also discussed.
合成了五组B环具不同取代基的黄酮和黄烷酮- 7 - o -异丙醇胺衍生物，并进行了对乌头碱诱发大鼠室性心律失常预防作用的药理试验。
Five groups of B-ring substituted flavone and flavanone-7-O-isopropanolamine derivatives were synthesized and tested on rats for the ventricular arrhythmia induced by aconitine.
重点介绍了金属茂的合成方法及环戊二烯环上的取代基、溶剂对合成及分离旋光性金属茂的影响。
The synthesis of metallocene, the effects of substitution in cyclopentadiene ring, reaction medium for synthesis and separation of chiral metallocene have been highlighted.
本文以马铃薯淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂对低取代度羟丙基淀粉的制备工艺进行了研究。
Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.
分析了芳环上取代基对氢重排的影响。
The effect of the substituents on the aromatic ring upon the hydrogen rearrangement was studied.
环氧胶接接头在水中破坏失效的原因主要是渗入到胶接层的水分子取代了胶粘剂分子在金属表面的粘附。
The reason of the failure of epoxy bonded joint in water was that the epoxy adhesive on the metal surface was substituted for water.
同时，抑制剂双环上的取代基团也能和活性口袋外部的部分残基形成一定的范德华和疏水相互作用。
Moreover, the substituents on the bicyclic chromophore can also produce strong van der Waals and hydrophobic interactions with the residues located at the exterior part of the binding pocket.
比较发现，茂环上的取代基越大越有利于二茂铁基阳离子与多阴离子之比小的电荷转移盐的形成。
The experiments show that large substituent group on Cp is favorable to the formation of CTSs with low ratio of ferrocenyl:POM.
更具体而言，本发明涉及一种或多种环酸酐或取代环酸酐作为活性载体的用途。
More particularly, the invention relates to the use of one or more cyclic anhydrides or substituted cyclic anhydrides as the reactive carrier.
本发明至少部分涉及新的取代的四环素化合物。
The present invention pertains, at least in part, to novel substituted tetracycline compounds.
摘要碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
Carbasugars carbocyclic analogues of true sugars are compounds in which the ring-oxygen of furan oid or pyranoid sugars is replaced by methylene group.
从而以高收率得到带各种取代基的环丙烷。
桥二环辛烷不给出有意义的桥头取代。
Bridged bicyclooctanes gave no significant bridgehead substitution.
取代酰基- 4 -磷酰基氨基硫脲及其1,3,4 -恶二唑杂环衍生物的合成。
The Synthesis of l-acyl-4-phosphoryl Thiosemicarbazides and Their Heterocyclic Derivatives of 1, 3, 4-oxadiazoles.
生测结果表明在吡啶环的2位合适的取代基和丙烯酸酯的3位取代基的体积对除草活性至关重要。
These results indicated that a suitable substituent at the 2-position of pyridine ring and a well-fit group at the 3-position of acrylate were both essential for hi.
氢的替代亲核取代反应(VNS)是与硝基芳环的亲电反应、亲核反应不同的一种新反应。
Vicarious nucleophilic substitution (VNS) of hydrogen is a new type of reaction which is different from the usual electrophilic and nucleophilic reactions of the nitro arenes.
活性亚甲基上的一个氢原子是被环氧基所取代的。
One of the hydrogen atoms of the active methylene group is replaced with a cyclooxy group.
新的硫取代含氮杂环膦酸化合物，药物组合物，和治疗钙与磷酸盐异常代谢的方法。
Novel thio-substituted, nitrogen-containing, heterocyclic phosphonate compounds, pharmaceutical compositions, and methods of treating abnormal calcium and phosphate metabolism.
Q 1 是可被取代的饱和或不饱和的5-或6-元环烃基等；
Q1 represents optionally substituted, saturated or unsaturated 5- or 6-membered hydrocarbyl, etc.
某些取代的苄基氨基杂环及杂芳基衍生物提供了意料不到的杀昆 虫和杀螨虫活性。
Certain substituted benzylamino heterocyclic and heteroaryl derivatives have provided unexpected insecticidal and acaricidal activity.
某些取代的苄基氨基杂环及杂芳基衍生物提供了意料不到的杀昆 虫和杀螨虫活性。
Certain substituted benzylamino heterocyclic and heteroaryl derivatives have provided unexpected insecticidal and acaricidal activity.
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