共查询到20条相似文献,搜索用时 125 毫秒
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商品灵猫香(非洲大灵猫Virerra zibetha所产)主含灵猫香酮(9-顺-环十七烯酮),及少量环十六、十七烷酮、6-顺-环十七烯酮和9-顺-环十九烯酮。我国小灵猫(Vivarricula indica Desmarest)所产灵猫香中大环酮组份尚未见报导。本文采用PEG-20M(Z′=368)与SE-30(Z′=44)的混合固定液分离环十五烷酮与麝香酮(3-甲基环十五烷酮)及环十七烷酮与环十七烯酮二个物质对,便于灵猫香和麝香在同一 相似文献
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本文研究了醇类(正丁醇、正戊醇、正辛醇和正癸醇)、油类(正十八烷、正十六烷、正十四烷、正十烷、正癸烷和正辛烷)、正十八烷含量以及NaCl浓度对Tween80/醇/油/水体系相图的影响。结果表明,NaCl浓度对Tween80/正辛醇/正十八烷/水体系相图的影响不明显;醇类随着炭原子数目的增加,O/W微乳液区面积增大,W/O微乳液区面积减小,微乳液区总面积增大;不同的油类形成的微乳液区面积由大到小的顺序是:正十六烷≈正十四烷>正十二烷>正癸烷>正十八烷>正辛烷;随着正十八烷含量的增加,微乳区面积减小。用2277热活性检测系统测定了石油菌B-2分别在非微乳液和助表面活性剂分别是正戊醇、正辛醇,油是正十八烷所形成的微乳液中生长的功率-时间曲线。结果表明微乳液培养基更适用于B-2利用高碳烷烃进行生长;正辛醇作助表面活性剂形成的微乳液培养基比正戊醇作助表面活性剂形成的微乳液培养更为有利;O/W型微乳液比W/O型微乳液对B-2的生长更为有利。 相似文献
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Pt/ZSM—5吸附与催化性能的研究 总被引:1,自引:0,他引:1
本文研究了氨和正已烷在Pt/ZSM-5上的吸附性能并考察了Pt含量和焙烧温度对正已烷芳构化性能的影响。结果表明,Pt含量和焙烧温度对吸附和催化性能有影响。Pt与分子筛的酸中心对芳构化均有作用。 相似文献
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用MNDO半经验分子轨道理论对一系列小环螺桨烷[1.1.1]螺桨烷、[2.1.1]螺浆烷、[2.2.1]螺浆烷及[2.2.2]螺桨烷中的C—C中心键进行了研究.结果表明小螺桨烷的边键与一般环状分子的C—C键强度接近,而在中心C—C上则形成一种比正常环状分子稍弱的共价键;随着螺浆烷环的增大,其C—C中心键强度增大,计算结果与前人实验和理论研究的结论一致。 相似文献
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烷类特种气体分析装置的研制及其应用 总被引:1,自引:0,他引:1
研制烷类特种气体分析专用的多维气相色谱仪,特制的热导检测器,具有手动-自动功能。设计了输气-配气装置和多维气相色谱流程。以微机控制,可按编辑程序清洗系统。检查本底,自动进样,显示或打印谱图和分析结果。可检测多种烷类特种气体组份及其中氧,氮,一氧化碳和甲烷等痕量杂质。 相似文献
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太湖沉积物中酮的提取、分离及GC-MS测定 总被引:1,自引:0,他引:1
用索氏抽提法提取了太湖沉积物中的可溶性有机质,用不同极性溶剂在硅胶/氧化铝柱上分离了饱和烃,芳烃,酮馏分。利用GC-MS对酮组份进行了分析。沉积物中检出了一系列呈等间距分布的正构烷基-2-酮:C14至C33,主峰为C29,具有强烈的奇碳数优势。 相似文献
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聚芳醚砜环状低聚物的基质辅助激光解吸电离质谱分析 总被引:3,自引:2,他引:3
采用基质辅助激光解吸电离飞行时间质谱技术分别对两种合成的聚芳醚砜环状低聚物进行了分析研究,并讨论了低聚物中不同聚合度离子组份的分布规律。 相似文献
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Iwao Omae 《Journal of organometallic chemistry》2011,696(6):1128-11388
Cyclometalation reactions proceed very easily with one step reaction between metal compounds and substrates having a heteroatom such as O, S, N, P and As. However, under mild reaction conditions, many agostic compounds which are intermediates in these cyclometalation reactions, can be isolated. The metal compounds used for the formation of these agostic intermediates are both transition metal and main group metal compounds. The substrates are nitrogen-containing compounds, phosphorus-containing compounds, oxygen-containing compounds and sulfur-containing compounds. These agostic intermediates are mainly δ-C-H agostic compounds, some are γ-C-H agostic compounds and very few are ?-C-H-agostic compounds. The agostic intermediates are prepared, usually, under mild reaction conditions in the cyclometalation reaction. These agostic compounds are also prepared from cyclometalation reaction products, e.g., by the protonation, irradiation, and elimination of ligand molecules by vacuum, inert gas current, dehydration with a molecular sieves 4A, etc. Some agostic compounds are utilized for preparation of stable catalysts, e.g., hydrogenation catalysts. 相似文献
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采用实沸点蒸馏仪对白石湖煤液化油进行馏分切割,切取<170℃液化粗油进行加氢精制脱除其中硫、氮化合物,采用硫化学发光气相色谱仪(GC-SCD)、氮化学发光气相色谱仪(GC-NCD)对液化粗油和精制油中硫、氮化合物进行分析表征,研究加氢精制过程硫、氮化合物的转化规律。结果表明,液化粗油中含硫化合物主要是噻吩类化合物和硫醇,经过加氢精制后基本消失,苯并噻酚类化合物脱除比例要低于噻吩类化合物,属于较难脱除含硫化合物。液化粗油中含氮化合物主要是苯胺类化合物,其次是吲哚类化合物,经过加氢精制吲哚类化合物全被脱除,苯胺和喹啉类化合物属于碱性含氮化合物,是精制油中残留的主要含氮化合物,含量达1.61 mg/kg。 相似文献
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氧锅盐是一类带正电行的杂环化合物,作为一种合成中间体,氧锅盐在有机合成方面已得到广泛的应用[’]近年来人们对其发光和光谱性质的研究也给予足够的注意.这是由于很多氧锅盐化合物有着很强的荧光发射【’J,并且其中有些已被用作激光染料出或Q一开关材料卜1由于氧钠盐强烈的亲电特性,因而它在聚乙烯咋哇电照相体系中也受到特殊的注意,即通过它来捕获电子和诱导分子内正空穴向负电极方向迁移问染料分子的刚性化对激发分子的弛豫过程往往会带来巨大的影响,如非刚性化分子会通过分子内自由旋转使分子在激发态的弛豫过程中形成不同的… 相似文献
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A method is described for the simultaneous determination of nanogram amounts of mono-, di- and tri-butyltin compounds in water. The procedure is based on the conversion of tin compounds to volatile species by Grignard pentylation and analysis using GC with flame photometric detection (GC FPD). The ionic compounds are extracted from diluted acidified (HBr) aqueous solutions by using a pentane-tropolone solution. The extracted organotin compounds are pentylated by a Grignard reagent and purified on a Fluorisil column before analysis by GC FPD. The detection limits are 20 ng dm?3 for butyltin compounds and 50 ng dm?3 for phenyltin compounds. Recoveries from spiking experiments in tap-water and natural seawater matrices, in which no organotin compounds were detected, were greater than 90% for most of the alkyltin compounds. 相似文献
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A series of pyrylium compounds with different structures have been synthesized. The photophysical behavior of these compounds has also been measured. Results show that the structures of compounds and the polarities of solvents make great effects on the photophysical behaviors of compounds, especially when the structures of compounds are hindered. It indicats that the intramolecular rotation relaxation of compounds in excited state in closely related to the fluorescence quantum yields of compounds. 相似文献
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Iwao Omae 《Journal of organometallic chemistry》2007,692(13):2608-2632
There are three types of reactions with intramolecular five-membered ring compounds in organic syntheses: The first type is reactions involving intramolecular five-membered ring compounds which are utilized for the ease of synthesis of these compounds and the stability of the products. The second is reactions performed via intramolecular five-membered ring intermediates, because such intermediates are very reactive and labile compounds. The third is the metal-catalyzed reactions with the intramolecular five-membered ring compounds because these metal compounds have catalytic activities. The third type reactions involving intramolecular five-membered ring pincer compounds are also provided.The first type reactions include carbonylations, alkenylations, alkynylations, acylations, isocyanations, Diels-Alder reactions, etc. The second type reactions include carbonylations, cross-coupling reactions, hydroacylations, ring expansion reactions, carbocyclizations, etc. The third type reactions include cross-coupling reactions, rearrangements, metatheses, reductions, Michael reactions, dehydrogenations, Diels-Alder reactions, etc. 相似文献
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In this study, eight new compounds derived from thiophene were synthesised and characterised. The four symmetrical compounds contain two heterocyclic 1,2,4- oxadiazole on each side of the 2,5-disubstituted thiophene, and the four non-symmetrical compounds contain alkyne groups as a spacer replacing one of these heterocycles. Some of the compounds presented liquid crystalline properties with smectic and nematic mesophases. The non-symmetrical compounds presented low emission of blue light. 相似文献
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《Journal of Saudi Chemical Society》2023,27(4):101670
Designing of molecules for drugs is important topic from many decades. The search of new drugs is very hard, and it is expensive process. Computer assisted framework can provide the fastest way to design and screen drug-like compounds. In present work, a multidimensional approach is introduced for the designing and screening of antioxidant compounds. Antioxidants play a crucial role in ensuring that the body's oxidizing and reducing species are kept in the proper balance, minimizing oxidative stress. Machine learning models are used to predict antioxidant activity. Three hydroxycinnamates are selected as standard antioxidants. Similar compounds are searched from ChEMBL database using chemical structural similarity method. The libraries of new compounds are generated using evolutionary method. New compounds are also designed using automatic decomposition and construction building blocks. The antioxidant activity of all designed and searched compounds is predicted using machine learning models. The chemical space of searched and generated compounds is envisioned using t-distributed stochastic neighbor embedding (t-SNE) method. Best compounds are shortlisted, and their synthetic accessibility is predicted to further facilitate the experimental chemists. The chemical similarity between standard and selected compounds is also studied using fingerprints and heatmap. 相似文献