环烯

E. 3-allyloxyisothiazole and N-allylisothiazolone, were synthesized with 3-mercaptopropionate as the starting material through ammonolysis, cyclization and allylation reactions.

以3-巯基丙酸甲酯为原料，经氨解、关环、烯丙基化合成了2种含有不饱和侧链的异噻唑类化合物，分别为3-烯丙氧基异噻唑和N-烯丙基异噻唑啉酮。

To develop an eco-friendly epoxy impregnating resin system for groundwall insulation of large generators, the curing reaction mechanism has been fully studied, the formulation and the curing techniques have been optimized, and the influence of different constitution on the curing reaction, microstructure, and final performances have been studied and characterized.In this paper, influences of different reactive organo-siloxanes on the curing reaction and performances of epoxy V.P.I.

本文研究比较了含有环氧基、氨基或乙烯基的反应性硅氧烷，包括：γ-缩水甘油醚氧丙基甲基二乙氧基硅烷、β-(3，4环氧环已基)乙基三乙氧基硅烷、γ-缩水甘油醚氧丙基三甲氧基硅、β-(3，4环氧环已基)乙基三甲氧基硅烷、γ-甲基丙烯酰氧基丙基三甲氧基硅烷、乙烯基三乙氧基硅烷和苯胺甲基三乙氧基硅烷对环氧V.P.I。

In the absence of organic solvent and phase-transfer catalyst, the catalytic oxidation of cyclohexene to adipic acid with aqueous 30% hydrogen peroxide by weight can be efficiently catalyzed by tungstenic acid/inorganic acidic ligand.

以钨酸／无机酸性配体为催化体系，在无有机溶剂和相转移剂的情况下，催化过氧化氢(质量分数30％)氧化环己烯合成己二酸。结果表明，以钨酸／磷酸催化氧化环己烯的催化效果最优。

85 And 119486/79. They are a novel type of antibiotic having both the wide antibacterial spectrum and high safety of penicillin and cephem antibiotics belonging to beta -lactam antibiotics, as well as the potent antibacterial activity and high beta -lactamase stability of carbapenem antibiotics.Sodium-(5R, 6S)-6-[-1-hydroxyethyl]-7-oxo-3- [-2-tetrahydrofuryl]-4-thia-1-azabicyclo [3.2.0] hept-2-ene-2-carboxylate 5/2 hydrate (faropenem sodium, hereinafter referred to as compound 1) is currently used as an oral drug for various infectious diseases and is reported to show potent antibacterial activity against not only methicillin-sensitive Staphylococcus aureus, Streptococcus pyrogenes and Streptococcus pneumoniae but also gram-positive bacteria for which conventional beta -lactam drugs have proved ineffective such as penicillin-resistant pneumococci, oral staphylococci and enterococci, also showing a wide antibacterial spectrum covering gram-negative bacteria such as Haemophilus influenzae and anaerobic bacteria such as the genus Bacteroides, which activity is due to its novel skeleton penem ring (Kagaku Ryoho no Ryoiki The Field of Chemotherapy, Vol.

他们是一种新型的抗生素都具有广泛的抗菌谱和高度的安全青霉素和cephem抗生素，属于β-内酰胺类抗生素，以及作为强大的抗菌活性和高β-内酰胺酶稳定的碳青霉烯类antibiotics.sodium -（ 5 R ， 6 S ）-6 -[ - 1 -羟乙基] - 7 -氧- 3 - [ - 2 - t etrahydrofuryl] - 4 -硫杂- 1 -氮杂双环[ 3 。2.0]庚- 2 -节能- 2 -羧酸5 / 2水合物（法罗培南钠，以下简称为化合物1 ）是目前用来作为口服药物，为各种传染病和报道，以显示强大的抗菌活性，不仅对甲氧敏感的金黄色葡萄球菌，链球菌pyrogenes和肺炎链球菌，但也克阳性菌为常规β-内酰胺类药物已证明无效，如青霉素耐药pneumococci ，口腔葡萄球菌和肠球菌，也显示出广泛的抗菌谱，包括革兰阴性菌如流感嗜血杆菌和厌氧菌如属杆菌，这活动是由于其新颖的骨架青霉烯环（（化学ryoho没有ryoiki领域的化疗），第13卷，第10号，第74-80 ， 1997年）。

Many kinds of organofullerenes are not stable under reductive, oxidative or thermal conditions, where the functional addends are removed from the fullerene sphere and lead to the formation of pristine fullerenes.

在还原、氧化或加热条件下，许多富勒烯衍生物的加成基团会从富勒烯骨架上断开，得到富勒烯母体，是富勒烯环加成反应的逆反应。

This makes Ni-W-P powder more suitable for partial hydrogenation of dienes. The kinetic results suggest there are some different between the active sites of Ni-P and Ni-W-P powder. DSC, XRD and EXAFS results suggest that the tungsten codeposition makes Ni-W-P powder more amorphous than Ni-P powder.

动力学结果表明在两种合金微粒上，不仅环戊二烯与环戊烯的相对配位能力不同，而且它们各自的反应速率常数也不一样，表明非晶态Ni-P、Ni-W-P合金微粒的催化活性中心存在着一定的差异。

Phytochemical investigation on the acetone extract of the stems of K.oblongifolia led to the isolation of 49 compounds and 31 of them were identified.They were 20 lignans,(including 11 dibenzocyclooctadienes,8 spirobenzofuranoid dibenzocycloocta -dienes,1 other lignan),9 flavones,and 1 nortriterpenoid.Among them,4 were new compounds,1 was new natural products,and 8 compounds were isolated from this family for the first time.

通过对冷饭藤的藤茎化学成分的研究，从丙酮提取物中分离得到49个化合物，鉴定了31个化合物，包括木脂素类化合物20个(联苯环辛烯类木脂素11个，螺苯骈联苯环辛烯类木脂素8个，其他类型木脂素1个)，黄酮类化合物9个，降三萜类化合物1个，其中。4个为新化合物，1个新的天然产物，8个为本科首次报道。

Due to the ring strain and Lewis acid character, silacyclobutanes and silacyclobutenes can undergo ring expansion reactions to afford five- and six-membered silacycles, or ring opening to give organosilicon molecules and materials as well as fulfill organic transformations under very mild conditions.

硅杂环丁烷和硅杂环丁烯由于存在环张力和具有一定的Lewis酸性，能够通过扩环反应生成五元和六元含硅杂环化合物，也能够通过开环反应生成不同结构的有机硅分子和聚合物，抑或实现有机反应在温和条件下的转化。

Advances in Research on Plants Reactions under Phosphate Starvation;2. Topics discussed in this article includes synthesis and structures of R2M24, the reactions of its metal-metal triple bond with various reagents such as nucleophiles, carbon-carbon mu.

本文对一类重要的ⅥB族金属叁键化合物R_2M_2_4(R为环戊二烯基及类环戊二烯基)近年来的研究成果进行了综述，综述重点是这类化合物的官能团M≡M参键的化学活性，全文包括R_2M_2_4的合成及结构，M≡M叁键与亲核试剂、与碳-碳重键，与氧或与金属羰基物等试剂的反应及其应用。

Topics discussed in this article includes synthesis and structures of R2M24, the reactions of its metal-metal triple bond with various reagents such as nucleophiles, carbon-carbon mu.

本文对一类重要的ⅥB族金属叁键化合物R_2M_2_4(R为环戊二烯基及类环戊二烯基)近年来的研究成果进行了综述，综述重点是这类化合物的官能团M≡M参键的化学活性，全文包括R_2M_2_4的合成及结构，M≡M叁键与亲核试剂、与碳-碳重键，与氧或与金属羰基物等试剂的反应及其应用。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失