Generally speaking, the reaction types involvingα-oxoketene--acetals mainly include the regioselective addition-aromatization with organometallic reagents, conjugate addition-cyclization with nitrogen nucleophilicspecies, nucleophilic reactions ofα-carbon, acting as odorless dithiol equivalentsin thioacetalization, Michael additions and [5+1] annulation, as well as the synthetic applications based on the above reactions.

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The present invention relates to the depolymering cyclization reaction of aromatic dithio ether polymer to prepare aromatic cyclic dithio ether compound under the presence of mercapto group containing compound and alkali matter.

本發(fā)明涉及利用芳香雙硫醚聚合物的解聚成環(huán)反應(yīng)來制備芳香雙硫醚環(huán)狀化合物的方法精品视频丝袜足j在线视频。該方法采用芳香雙硫醚聚合物在含巰基的化合物和堿性物質(zhì)存在的條件下發(fā)生解聚成環(huán)反應(yīng)生成雙硫醚環(huán)狀化合物。

Chapter two 4-Hydroxybenzoic acid is connected with PEG6000 through defoliant DCC at rooom temperature, then the product is refluxed with chloroacetic acid in acetone to afford PEG-bound phenyloxyacetic acid, which is reacted with thionyl chloride, ammonium thiocyanate and arylamines in turn to give PEG-bound disubstituded thioureas. After the cleavage with sodium methoxide in methanol, the eleven disubstituted thioureas are obtained.

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Vulcanization thing in sulphur natural gas, take off to exclude, Make organic sulfur content and the vulcanization hydrogen of the natural gas of raw material accord with relevant technical index requirement , satisfy production needs,Today of the chemical swift development of natural gas the desulphurization method of natural gas also emerge endlessly , In traditional a ethanol amine the foundation of wet desulphurization and the dry law desulphurization of zinc oxide on, have arisen the desulphurization of normal temperature of ferric oxide, the dry law desulphurization of activated carbon and member sift desulphurization, DDS biochemical wet desulphurization wait for new technology .

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The method comprises:(1) weighing lead acetate hexahydrate and thioacetamide, and preparing aqueous solutions respectively, so that the concentration ratio of Pd2+ to S is 1:(1-4);(2) adding acetic acid into thioacetamide solution to adjust the pH value to 2-4;(3) adding poly surfactant into lead acetate solution, ultrasonicating to mix uniformly and obtain a colorless and transparent sol;(4) mixing the sol and thioacetamide solution;(5) placing the mixed solution in a sealed container, irradiating by 2.5 MeV and 40 mA electron accelerator with irradiation dose of 25-40 Mrad;(6) washing the product, centrifuging for separation, and drying to obtain black PdS nanoparticles.

本發(fā)明方法的工藝過程如下：首先稱取一定量的六水合醋酸鉛和硫代乙酰胺，各自配制成水溶液日韩精品一区地址一地址二，其濃度比為使其中的鉛離子濃度與硫原子濃度的比例為1∶1～1∶499精品黄色免费看；在硫代乙酰胺溶液中加入適量醋酸調(diào)節(jié)其pH值至2～4；醋酸鉛溶液中加入少量表面活性劑聚乙烯醇爱爱小说网，然后超聲振蕩久久99精品久久久久久国产荷花，混合均勻，制成無色透明溶膠com.91视频；隨后將溶膠與上述的硫代乙酰胺溶液混合国产欧洲aaa；將該混合液置于密閉容器中，并將其放置于2.5MeV玖玖爱在线视频免费观看、40mA的電子加速器產(chǎn)生的電子束輻照下進行輻照處理欧美大泬，其輻照劑量為25～40Mrad；然后將反應(yīng)生成物清洗欧美嘿咻嘿咻在线视频，并用高速離心機離心分離日韩网红美女主播自拍视频在线播放，然后干燥，最終得到黑色納米硫化鉛顆粒一级性爱在线看。

Chapter 4 describes the synthesis, structural characterization and properties of anovel organic-inorganic hybrid compound, F〓〓BEDT-TTF =bis(ethylenedithiotetrathiafulvalene, which has been synthesized through thereaction of the pre-intercalate Fe〓PS〓〓(phen = 1.10-phenanthroline) with〓 Compared with the pristine FePS〓, the lattice spacing isexpanded by about 4.0〓, indicating that the molecular ring plane of BEDT-TTF isarranged parallel to the layer of the host.

通過紅外光譜推測客體BEDT-TTF在層間以中性狀態(tài)存在国产全程粗口对白。X-線光電子能譜揭示在夾層化合物Fe〓PS〓〓中磷原子和硫原子在硫代亞磷酸根負離子簇中各存在兩種化合價態(tài)，其中一種價態(tài)與純主體或預(yù)夾層化合物〓〓中的磷原子和硫原子價態(tài)一致av黄片入口，而另一種價態(tài)卻比純主體FePS〓或預(yù)夾層化合物Fe〓中的磷原子和硫原子價態(tài)高免费看到女人爽到高潮的视频。

The paper commencing with analyses of the basic property of the hydrate, structure and sort, analyzes micro kinetics, formation condition, gas hydrate formation mechanism and influencing factor in high sulfur; also proceed analysis in depth for existent hydrate prediction model; according to gas dissolving, hydrate lattice deformation, synergistic action of inhibitor, carry out analytical study for existent error between normal forecast model and physical condition; introduce key parameter theory to establish and modify prediction model of hydrate formation condition to suit for high sulfur gas reservoir and inhibitor system, analyses different kinds of prevention and cure measures to influence of hydrate; finally, through field application in high sulfur gas reservoir hydrate.

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Besides, it can degrade the sulfur in phenyl sulfide and dodecanethiol.

除此之外，它還可以脫除苯硫醚和硫醇類含硫化合物中的硫与子乱互换乱婬视频。

Was admitted to hospital on October 6, 2007, diagnostic schizophrenia, the sulfur that use Kui is smooth increase by degrees law, be admitted to hospital sulfur of 3 weeks of Kui is smooth add send 600 Mg/d, patient spirit symptom is improved somewhat, already dare contact with people, but be certain the husband has an affair, the sulfur that add Kui makes the same score 800 Mg/d, when treating the 7th week, the patient becomes aware the whole body is faint, accept is poor, measure temperature 9 ℃ of 37 ·, morrow double legs appears erythema to weighing out, local strut, the about 1 hip inside week, back, prothorax appears group by group erythema, patient skin itchs somewhat feeling, temperature 39 ℃, kui sulfur makes the same score out of service to fight constituent amine medicaments, vein is pushed note dextrose acerbity calcium and vein drop to note vitamin C, remedial 10d, erythema disappears.

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It was found that the endo-type sulfonium salts were also worked but afforded the corresponding cyclopropanes with opposite absolute configuration compared with that from the exo-type salt.

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