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)aaa日欧美女，由于溴代苯乙酮是含有羰基的鹵代烴結(jié)構(gòu)久色入口，它可以發(fā)生親電取代和親核加成反應(yīng)黄色网站在线观看的，當(dāng)活潑亞甲基類化合物為乙酰乙酸乙酯和β-二酮時(shí)操草网站，控制反應(yīng)條件可以發(fā)生單取代和雙取代兩種產(chǎn)物；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)在线观看激情无码毛片，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-酮衍生物国产1级在线视频网站免费，這在以前的研究中是沒有發(fā)現(xiàn)的。

Major procurement of goods: a three-chlorosilanes, dichloromethane, AE activity ester, 3-iodine Silane, special acid, pentyl chloride, triethylamine, thiadiazole, tetrazolylazo acid, 2 - Acetamide, tetrahydrofuran, the four-guanidine, isopropanol, five phosphorus trichloride, sodium vary bitter, acid, sodium phenylacetate, 6-2 silicon n-amine, Ethylacetoacetate , Methyl isobutyl ketone, potassium dihydrogen phosphate, aluminium oxide, DL methionine, N, N-dimethylaniline, NN-diethyl aniline, 4 sodium EDTA, Anhydrous sodium sulfate, ammonium sulfate, potassium sulfate, sodium acetate, sodium carbonate, DMC, formic acid, sodium chloride medicinal, oxalate, protopine, acetone, alcohol, acetic acid, vinegar Ethyl, butyl acetate, methanol, ethanol (anhydrous, industrial, medicinal), formaldehyde, Ye Jian (30%), hydrochloride (industrial-grade, refined grade, reagent level), sulfate (98%), Ammonia, calcium carbonate, chlorine dioxide, 6 - APA ,7-ACA ,7-ADCA ,7-ANCA, sulbactam, ceftazidime activity ester, Deng salt (hydroxymethyl-K, acid precursors Potassium, sodium dihydrogen methyl), resin, the enzyme, water treatment agent, Xiao Mo agent, demulsifier, flocculants, activated carbon, all kinds of medicinal materials, All kinds of additives

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objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

摘要］ 目的：用氣相色譜法測(cè)定依達(dá)拉奉合成起始原料乙酰乙酸乙酯中丙酮的殘留量一区二区三区激情欧美亚洲日本。方法：采用固定相為二乙烯苯乙基乙烯苯型高分子多孔小球（直徑為0.18 mm～0.25 mm）欧美日本高清，氮?dú)鉃檩d氣，用外標(biāo)法測(cè)定乙酰乙酸乙酯中殘留丙酮的含量黄色网站直接看的。結(jié)果：該方法在丙酮濃度范圍在25 μg/ml～400 μg/ml內(nèi)呈良好的線性關(guān)系草草欧美视频在线播放二区，響應(yīng)曲線相關(guān)系數(shù)為0.996，平均回收率為96.8%91视频三级片。結(jié)論：本法簡(jiǎn)便黄粗暴高潮小说视频，快速、實(shí)用在线www.aaa，靈敏度高欧美性爱俺去操你啦，可有效地用于乙酰乙酸乙酯的質(zhì)量控制。

Eight novel N,N′-naphthalene acyl substituted aromatic acylamino thiocarbamides(Ⅱ1~Ⅱ8) were synthesized from aryl acylhydrazine and α-naphthalene acyl isothiocyanate, which was obtained by the reaction of potassium thiocyanate with α-naphthalene acyl chloride obtained from 2-naphthylacetic acid and thionyl chloride in anhydrous benzene.

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Ethoxycarbonyl-4,5-dimethyl-pyrrole (7) was prepared from ethylacetoacetate, ethyl formate and methyl ethyl ketone via oximination, Claisen condensation, and reductive condensation. The bromization of compound 7 gave 2-ethoxycarbonyl-3-bromo-4,5-dimethyl-pyrrole(8), which could be transferred to 2-ethoxy-carbonyl-3-brome-4-methyl-5-formyl-pyrrole (9) by the formolation.

由乙酰乙酸乙酯、甲酸乙酯及丁酮等原料經(jīng)過肟化国外女网址www女、Claisen縮合黄色彩网、還原縮合成環(huán)得到2-乙氧羰基－4，5-二甲基－吡咯(7)一区二区三区无码日韩久久，溴化生成2-乙氧羰基－3-溴491超碰日韩精品国产，5-二甲基－吡咯(8)，最后經(jīng)過甲豕媸灯瓢谙呶蘼胧ι化反應(yīng)得到目標(biāo)產(chǎn)物2-乙氧羰基－3-溴－4-甲基－5-甲趸破倥墓劭矗基－吡咯(9)。

Cuspidate with 33％ identity and 50％ similarity to taxadien-5α-ol-O-acetyltransferase, 34％ identity and 52％ similarity to 10-deacetylbaceatin Ⅲ-10-O-acetyltransferase, and 33％ identity and 49％ similarity to taxane 2α-O-benzoyltransferase, respectively, moreover, it contained the conserved HXXXDG motif that is found in other transacylases, this sequence element has been suggested to function in acyl group transfer from acyl CoA to the substrate alcohol.

No.AF448807）在氨基酸水平與大部分植物來源的醭鲈诟桑基轉(zhuǎn)移酶具有較大的同源性18av黄色，其中與東北紅豆杉紫杉二烯-5α-醇-乙酰轉(zhuǎn)移酶的一致性達(dá)33％、相似性達(dá)50％男人女人插动态，與東北紅豆杉紫杉10-去乙酰巴卡亭Ⅲ-10-0-乙酰轉(zhuǎn)移酶的一致性達(dá)34％亚洲国产欧美日韩A片在线观看、相似性達(dá)52％亚洲色图偷，與東北紅豆杉紫杉二烯2α-0-苯甲酰轉(zhuǎn)移酶的一致性達(dá)33％亚洲国产欧美日韩AⅤ、相似性達(dá)49％，并且在TS4的氨基酸序列中還發(fā)現(xiàn)豕琅瓵AA在线；D(zhuǎn)移酶家族成員特有保守序列HXXXDG九九视频精品38在线播放，這個(gè)序列單元被認(rèn)為在將酰基CoA轉(zhuǎn)移至醇類底物的過程中發(fā)揮作用欧美性交片网站。

NOBS PAG , can obviously activate hydrogen peroxide thus , the efficiency of hydrogen peroxide bleaching can be advanced greatly .

研究結(jié)果初步表明欧美乱婬视频婬色，此類有機(jī)跞巳嗣巳瞬偃巳丝慈巳烁桑化劑類如：四乙酰乙二胺，四乙酰甘脲日韩新片免费无码观看视频网站下载，異壬酰氧基苯磺酸鈉日韩精品欧美国产精品亚，五乙酰葡萄糖等有著非常明顯的活化過氧化氫的作用，從而能在很大程度上提高紙漿過氧化氫漂白的效率最刺激得黄色网站。

The famciclovir was synthesized from purine by a series of steps by Acylation, Decarboxylation, Reduction ,and so on; Derivatives of these intermediates is described from the 6-chloro- 9H- purin-2-amine as raw materials in different conditions when the iodine and bromide were synthesized with the addition of two intermediate 6-bromo-9H-purin-2-amine and 6-iodo-9H-purin-2-amine; There is elaborated from the main part of a acetophenone, urineaminohydrochloride, phenylhydrazine, ethyl acetoacetate as raw material through a series of reactions to synthetic 3-phenyl-4-formylphenyl pyrazole and 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-aldehyde two pyrazole aldehyde, and then with 2-amino-6-chlorine-9-(2-methicillin-oxo-co-methyl-4-yl) purine reaction of the two new pyrazole purine Schiff bases.

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Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethyl malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effective base.

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Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethy malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effectiv base.

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