- 更多网络例句与碳环的相关的网络例句 [注:此内容来源于网络,仅供参考]
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The results showed that the initial temperature of methanation is different for the carbonaceous phases with different stability.
研究结果表明,不同稳定性的碳相在氢气氛下的起始甲烷化温度是不一样的,构成碳纳米管主体的六元环的碳,较之类似活性碳的杂形碳以及主要由五元环和七元环构成的碳纳米小颗粒,在氢气氛下是较为稳定的。
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The number of hexagon carbon ring with different polimerity index in the structural representation of fullerene cages Cn, x, y, z and u are solution for indeterminate equation HPI=(Ax+By+Cz+Du)/.
在富氏碳笼的结构表达式中,不同聚合度的六边形碳环的数目x,y,z,u是由不定方程6x+5y+4z+3u=3n-120决定的,该文给出了方程的求解方法。
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This invention provides compounds of Formula; wherein: R is a moiety selected from the group: and n is an integer of 1 or 2; R is selected from hydrogen, amino,-NRR, alkyl of 1 to 12 carbon atoms optionally substituted, aryl of 6, 10 or 14 carbon atoms optionally substituted, alkenyl of 2 to 12 carbon atoms optionally substituted, alkynyl of 2 to 12 carbon atoms optionally substituted, halogen, and a 5 to 10 membered heteroaryl ring optionally substituted, having 1 to 4 heteroatoms independently selected from N, O and S; R is selected from hydrogen, alkyl of 1 to 12 carbon atoms optionally substituted, aryl of 6, 10 or 14 carbon atoms optionally substituted, alkenyl of 2 to 12 carbon atoms optionally substituted, vinyl, alkynyl of 2 to 12 carbon atoms optionally substituted and halogen; R is H, alkyl of 1 to 12 carbon atoms optionally substituted, cycloalkyl of 3 to 8 carbon atoms, bicycloalkyl of 5 to 10 carbon atoms or aralkyl optionally substituted; R is OH or -OH; R and R are each independently H or alkyl of 1 to 12 carbon atoms or when optionally taken together with the nitrogen atom to which each is attached form a 3 to 8 membered saturated heterocyclyl ring; R is alkyl of 1 to 12 carbon atoms optionally substituted; or a tautomer or pharmaceutically acceptable salts thereof.
本发明提供式的化合物;其中:R 1 为选自基团和的部分;n为整数1或2;R 2 选自氢、氨基、-NR 6 R 7 、具有1到12个碳原子的视情况经取代的烷基、具有6个、10个或14个碳原子的视情况经取代的芳基、具有2到12个碳原子的视情况经取代的烯基、具有2到12个碳原子的视情况经取代的炔基、卤素和具有1到4个独立地选自N、O和S的杂原子的视情况经取代的5元到10元杂芳基环;R 3 选自氢、具有1到12个碳原子的视情况经取代的烷基、具有6个、10个或14个碳原子的视情况经取代的芳基、具有2到12个碳原子的视情况经取代的烯基、乙烯基、具有2到12个碳原子的视情况经取代的炔基和卤素;R 4 为H、具有1到12个碳原子的视情况经取代的烷基、具有3到8个碳原子的环烷基、具有5到10个碳原子的双环烷基或视情况经取代的芳烷基;R 5 为OH或-OH 8 ;R 6 和R 7 各自独立地为H或具有1到12个碳原子的烷基,或当视情况与其所连接的氮原子连接在一起时形成3元到8元饱和杂环基环;R 8 为具有1到12个碳原子的视情况经取代的烷基;或其互变异构体或医药学上可接受的盐。
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In this thesis, we want to describe the new one-carbon and three-carbon chain extension and ring expansion of 2-aroyl-3,4-dihydro-2H-naphalen-l-one, which is the first report based on our knowledge.
本文在前人的研究基础上,首次开展了α—芳酰基苯并环己酮增加一个碳原子和三个碳原子的自由基扩环和链增长反应,以及自由基加成成环反应。
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Being combining with products distribution in styrene oxidation, we propose the styrene epoxidation carry out with Ti metallacyclo intermediates, And at the same time Ti-ZSM-5 have properties both catalytic epoxidation and acid-catalysis, namely the skeletal Ti can catalyze styrene epoxidation to styrene oxide and the skeletal Ti and Al can provide Lewis acid site to cause the rearrangement of styrene oxide to phenylacetaldehyde rapidly, the solvolysis to glycols and the cleavage of C=C double bond. Ti-ZSM-5 can also provide Bronsted acid site simultaneously, which is also catalytic center for the solvolysis to glycols.
同时结合Ti-ZSM-5催化选择性氧化苯乙烯反应的产物分布结果,提出苯乙烯环氧化反应可能是通过金属有机环机理进行;Ti-ZSM-5同时具有催化环氧化和酸催化两种功能,其骨架钛可催化苯乙烯环氧化生成环氧苯乙烷,而骨架钛和骨架铝等可提供Lewis酸位使环氧苯乙烷迅速发生重排生成苯乙醛从而使其成为反应的主要产物,同时还可发生加成以及碳碳键的裂解等副反应:Ti-ZSM-5也提供Bronsted酸位,它也是生成加成产物的活性中心。
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The Nazarov cyclization, a powerful tool for the construction of five-membered carbocycles from divinyl ketones and related compounds, has attracted increasing attention in recent years due to its wide applications in the synthesis of complex natural and unnatural products.
Nazarov环合反应是通过二烯酮类物质和类似化合物构建五元碳环的有效方法。由于该方法广泛地应用于复杂天然和非天然产物的合成,近年来引起人们的广泛关注。
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An atom other than carbon in the structure of a heterocyclic compound.
碳环的有一个仅由碳原子组成的环的,如苯
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Synthesis with carbocyclic compounds, such as cyclodienylsilane, quinic acid and norbornene etc, as starting materials is discussed in detail.
重点介绍了以环二烯基硅烷、奎宁酸、降冰片烯等碳环化合物为原料合成碳环糖的进展。
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The geometric optimization of C_(59)Sm and C_(60)Sm shows that the replacement of a C atom with a Sm in C_(60) yields a stable substitutionally doped fullerene C_(59)Sm, and among the five possible optimized geometries for C_(60)Sm, the most favorable exohedral sites are above the center of a hexagon and a pentagon ring.
替代掺杂富勒烯C_(59)Sm与外掺杂富勒烯C_(60)Sm几何结构与电子结构分析表明,以Sm原子取代C_(60)分子中的一个碳原子后碳笼仍保持稳定的替代结构,而对五种可能的C_(60)Sm结构,Sm原子倾向于栖息在六碳环与五碳环的空洞上方。
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The data of selected structure parameters of (C_5H_5)_3Ln· THF, such as the average distance between the penta carbon ring and the central metal, the distance between the penta carbon center or the coordinated THF and the central metal, showed that their values decreased with the increase of atomic number.
产物(C_5H_5)_3Ln·THF的特征结构参数,如五元碳环的碳原子与中心金属的平均距离,五元碳环质心与中心金属距离,配位的四氢呋喃氧原子与中心金属距离,由于&镧系收缩现象&,随着中心原子序数的增加而减小。
- 更多网络解释与碳环的相关的网络解释 [注:此内容来源于网络,仅供参考]
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activated carbon:活性碳
活性碳(activated carbon)的主成分为碳,并掺有少量的氢、氧、氮、硫等化合而成,为黑色且表面复杂的多孔性物质,结构则为碳所形成的六环状物,粒形可以从圆柱形粗颗粒到细粉末粒子,故有粒状及粉末状两种型态.
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Calvin cycle:卡尔文循环,光合碳还原环
caltractin 钙牵蛋白[一种与基粒相关的钙结合蛋白] | Calvin cycle 卡尔文循环,光合碳还原环 | calyculin 花萼海绵诱癌素[取自花萼盘皮海绵的磷酸酶抑制剂]
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carbine:碳烯
MIT的研究人员发现,在奈米碳管中加入碳烯(carbine)或氮烯(nitrene)群分子后,仍能保持奈米碳管的导电性. 在奈米碳管中加入这类[2+1]环加成(cycloadditions)型分子后,会造成碳管侧壁的碳原子键被打断,并因而改变碳管的电子结构,
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CARBONYL SULPHIDE:氧硫化碳
开发新的替代技术.目前,被提及的新的熏蒸剂有硫酰氟、氧硫化碳(carbonyl sulphide)、环氧丙烷(propylene oxide)、甲基碘(methyl jodide)、臭氧(ozone)、甲酸甲酯(ethyl formate)和氢氰酸(hydrogen cyanide).硫酰氟被认为是很有前景的熏蒸剂替代品,
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OC:有机碳
以X射线荧光光谱仪、有机碳测分析仪、GC/MS为测试手段对长春市环境空气中总悬浮颗粒物中的无机元素、有机碳(OC)和多环芳烃(PAHs)进行分析测试.通过对各元素和有机物的组成和浓度时空分布规律研究,
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steroid:类固醇
(二)类固醇 类固醇(steroid)是环戊稠全氢化菲的衍生物. 天然的类固醇分子中的双键数目和位置,取代基团的类型、数目和位置,取代基团与环状核之间的构型,环与环之间的构型各不相同. 其化学结构是由三个六碳环已烷(a、b、c)和一个五碳环(d)组成的稠和回环化合物.
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bicyclo:二环
将桥环烃变为链形化合物时,要断裂碳链,如需断两次的桥环烃称为二环(bicyclo),断三次的称三环(tricyclo)等等,然后将桥头碳之间的碳原子数(不包括桥头碳)由多到少顺序列在方括弧内,数字之间在右下角用圆点隔开,
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chrysene:屈
文章摘要:以多环芳烃[艹屈](Chrysene)为选择培养基的碳源,从焦化污泥中筛选出-株[艹屈]的高效降解菌SQ-1,SQ-1可在以[艹屈]为唯一碳源的无机盐培养基中生长,经过电镜形态学观察、生理生化和16SrDNA序列分析,并基于16SrDNA序列结果,
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heterocyclic compound:杂环化合物
杂环化合物 杂环化合物(heterocyclic compound) 杂环化合物是分子中含有杂环结构的有机化合物. 构成环的原子除碳原子外,还至少含有一个杂原子. 杂原子包括氧、硫、氮等. 从理论
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Pericyclic reaction:周环反应
(二)周环反应(Pericyclic Reaction):Diels-Alder环加成反应为[4+2]反应. 丁二烯-1,3与乙烯加成产生环己烯的一类反应. 本反应为光化学禁阻反应,加热却能进行,为对称性允许的热反应. 此外,光化学环加成反应及碳烯(Carbene)反应均属于本类反应.