We have had the extensive studies on theα-acetyl-α-carbamoyl ketene--acetals and its further applications, for example, their adols condensations with aldehydes giveα-alkenoyl-α-carbamoyl ketene--acetals which can be utilized as the 1,5-bielectronic five-carbon components to react with various binucleophlilic species in a [5+1] annulation.

我們小組在以前的工作中對(duì)α-乙?在线观看黄色网址；?α-胺甲酰基二硫縮烯酮在合成中的應(yīng)用進(jìn)行了深入的研究，如與醛縮合生成α-烯跤只朴执碳び炙置夥训氖悠担基-α-胺甲跣咝呱?1精品网站；蚩s烯酮，將其作為1黄片a片在线免费观看，5-雙親電五碳合成子的[5+1]成環(huán)策略等久久人人澡人人爽人人爱。

Ingredients: Rose oil, rose fruit Oil, clove flower oil, deionized water, isopropyl myristate, glycerol, propylene glycol, polyethylene glycol -400, central PDMS, poly dimethyl siloxane, PDMS alcohol, polyacrylamide, C13-14 iso-paraffin, octoic acid / capric Acid Triglyceride, lauryl alcohol -7, hydroxyethyl acrylate, acryloyldimethyltaurate copolymer, squalane, poly sorbate esters -60, PEG-20 sorbitan laurate, panthenol, allantoin, methyl p-hydroxybenzoate, diazolidiny1 urea, 3-iodo-2-propynyl-butyl-carbamate, essence.

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hydantoin was synthesized from diethyl malonate comprising condensation with 1, 2-dichloroethane, ammonolysis to diamide, Hoffmann degradation to give 5-cyclopropanespirohydantoin, and ring-opening with 40% hydrobromic acid.

以丙二酸二乙酯為原料，先與1黄A片欧美一区在线视频观看， 2-二氯乙烷縮合生成1国产精品高清无码， 1-環(huán)丙烷二羧酸二乙酯，再經(jīng)氨解生成197超碰奶水十足精品网站， 1-環(huán)丙烷二甲酰胺H漫无遮挡全彩纯肉动漫，然后在次氯酸鈣溶液中進(jìn)行Hoffmann降解成環(huán)生成5-環(huán)丙螺海因精品日韩欧美一区二区久久，最后在40%氫溴酸中開環(huán)得到5-溴乙基海因。

In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是讓活潑亞甲基類化合物與溴代苯乙酮發(fā)生化學(xué)反應(yīng)先锋资源网站在线，由于溴代苯乙酮是含有羰基的鹵代烴結(jié)構(gòu)劲爆A片免费网址，它可以發(fā)生親電取代和親核加成反應(yīng)，當(dāng)活潑亞甲基類化合物為乙酰乙酸乙酯和β-二酮時(shí)永久免费的毛片视频网站，控制反應(yīng)條件可以發(fā)生單取代和雙取代兩種產(chǎn)物人人操必人人操；當(dāng)活潑亞甲基類化合物為乙酰乙酰芳胺類化合物來反應(yīng)時(shí)，溴代苯乙酮中的羰基與氨基會(huì)發(fā)生分子內(nèi)的關(guān)環(huán)反應(yīng)生成吡咯烷-2-酮衍生物有什么网址可以看毛片，這在以前的研究中是沒有發(fā)現(xiàn)的日韩特级无码毛片免费视频。

With benzoic acid, terephthalic acid, 2. 6naphthalene dicarboxylic acid, dimethyl-2, 6-naphthalene dicarboxylate as solutes, water, acetic acid, N, N-dimethylformamide, N, N-dimethylacemide, dimethyl sulphoxide, N-methl2-ketopyrolidine, and the mixture of water and acetic acid as solvents respectively, the solubilities of 15 binary systems and 4 ternary systems were determined.

實(shí)驗(yàn)以苯甲酸、對(duì)苯二甲酸高清无码黄色视频在线关看、2亚洲激情一区二区三区四区，6-NDCA、2久久99精品久久久久久67194，6-萘二甲酸二甲酯為溶質(zhì)222www免费观看，以水、醋酸大秀视频网、N午夜亚洲视频，N-二甲基甲酰胺、N,入级性交片，N-二甲基乙酰胺超碰97公开免费在线、二甲基亞砜、N-甲基-2-吡咯烷酮以及水和醋酸的混合溶液為溶劑欧系a片黄片，測定了十五個(gè)二元物系和四個(gè)三元物系的溶解度數(shù)據(jù)美女视频黄色网。

In the third chapter, the synthesis of5-[(1"S)-1",2"-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde oxime(2) from5-[(1"S)-1",2"-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde(1) and phenyl-hydrazine were introduced firstly. The synthesis of nine dioxapyrrolino[3,4-c]pyrazoles containing chiral pyrazolyl moiety(6a-i) from 2 with N-substituted-phenylmaleimide by nonmetal oxidant IBD-initiated intermolecular 1,3-dipolarcycloaddition was described in detail.

第三章首先以5-[(1′S)-1′，2′-二乙酰氧基乙基]-1-苯基吡唑-3-醛(1)和苯肼為原料www.fxjy888.com，合成了化合物5-(1′S)-1′欧美在线888，2′-二乙酰氧基乙基1-1-苯基吡唑-3-醛-苯腙(2)；再用化合物(2)與N-取代苯基馬來酰亞胺反應(yīng)国产精品自在线拍国产不卡，利用無金屬氧化劑—IBD引發(fā)1日韩爱色成人片在线观看视频网站，3-偶極反應(yīng)，發(fā)生分子間的環(huán)加成插人妻视频，合成了9種新型手性吡唑連二氧代吡咯啉并

In this paper, the synthesis of polyamide acid resin, with 4, 4′-diam-inodiphenyl ether and pyromellitic dianhyride as monomers and dimethylacetamide as solvent, is reported; the preparation of polyimide fiber from PAA resin by dry- spinning method is described; and the effects of various factors of operating conditions upon the mechanical properties of the fiber is discussed.

本文報(bào)導(dǎo)了用4色综合久久综合网88，4′—二氨基二苯醚與苯均四酸酐作單體，在N三级插逼网站，N′—二甲基乙酰胺溶劑中合成聚酰胺酸樹脂国产区你懂得，以及用該樹脂經(jīng)干紡法制備纖維和制備過程中各項(xiàng)參數(shù)對(duì)纖維力學(xué)性能的影響。

With land area of 2,800M2 and completed quality supervision test instrument, its annual sales amount reaches 30,000,000 RMB. Its main products, Succinimide,butanimide,2.5-diketopyrrolidine;N-bromobutanimide or N-bromosuccinimide;N- chlorosuccinimide (N-chlorobutanimide);Bromoacetonitrile,Bromomethyl cyanide; Quinoline;P-Bromophenol;4-Bromophenol;N.N'- dicyclohexylcarbodiimide;S-3-Hydroxy-γ-Butyrolactone;2.3-Dihydrofuran;Ammonia water, Ammonium hydroxide; sell well in the US, South Korea, Europe and other countries and are praised highly by all clients.

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Results Eleven compounds were obtained and identified as sarcodonin A, scabronine B, 3β-hydroxy-5α, 8a-epidioxyergosta-6, 22-dien,(22E, 24R)-ergosta-7, 22-diene-3β, 5α, 6β-triol,(22E, 24R)-ergosta-7, 22-diene-3β-ol, benzoic acid, 4-hydroxylben-zaldehyde, 4-monopropanoylbenzenediol, ethy1-β-D-glucopyranoside, thioacetic anhydride,(2S, 2'R, 3S, 4R)-2-(2-hydroxyoctadecanoylamino) docosane-1, 3, 4-triol.

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The results showed 3 types of aluminum compound prepared in this paper all had good poison protection effectiveness on such impurities as stannous chloride,lead oxide,sodium hydrogen sulfate,and so on.Moreover,the mechanism of the poison of catalyst was also discussed.

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